Pseudorapidity distribution of charged hadrons in proton-proton collisions at root s=13TeV

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Physics

Letters

B

www.elsevier.com/locate/physletb

Pseudorapidity

distribution

of

charged

hadrons

in

proton–proton

collisions

at

√

s

=

13 TeV

Receivedinrevisedform20September 2015

Accepted1October2015 Availableonline8October2015 Editor:M.Doser Keywords: CMS Physics Proton–proton 13TeV Hadrons Spectra

Thepseudorapiditydistributionofchargedhadronsinppcollisionsat√s₌13 TeV ismeasuredusing a data sample obtained with the CMS detector, operated at zero magnetic field, at the CERN LHC. The yield ofprimary charged long-lived hadronsproduced ininelastic pp collisions isdetermined in the central region ofthe CMS pixel detector (_|η| <2) using bothhit pairs and reconstructed tracks. For central pseudorapidities (|η| <0.5), the charged-hadron multiplicity density is dNch/dη||η|<0.5=

5.49±0.01(stat)±0.17(syst),avalueobtainedbycombiningthetwomethods.Theresultiscompared topredictionsfromMonteCarloeventgeneratorsandtosimilarmeasurementsmadeatlowercollision energies.

©2015CERNforthebenefitoftheCMSCollaboration.PublishedbyElsevierB.V.Thisisanopenaccess articleundertheCCBYlicense(http://creativecommons.org/licenses/by/4.0/).FundedbySCOAP3_.

1. Introduction

Theyieldsofchargedhadronsareamongthemostbasic phys-icalobservables inhigh-energy particle collisions andprovide an essentialfirststepinexploringthephysicsofanewenergyregime. Studiesofsuch yieldshave alonghistoryin high-energyparticle andnuclearphysics, aswell asincosmic ray physics. Atcollider energies, the inclusive production of charged hadrons is driven by a combination of perturbative and nonperturbative quantum chromodynamics(QCD) phenomena, such assaturation ofparton densities,multiparton interactions,partonhadronization,andsoft diffractivescattering.

Theyields ofprimary charged hadronsare commonlystudied usingtheir multiplicity asa functionof pseudorapidity, dNch/dη. Ofparticularinterestforunderstandingthephysicsofhadron pro-duction is the dependence of dNch/dη on the collision energy, whichreflectstherelativerolesofsoft- andhard-scattering contri-butions.Softinteractions,whicharemodeledphenomenologically, give rise to a significant fraction of the produced particles. Con-tributionsfromhard-scatteringprocessesincreasewithincreasing collisionenergies. Measurementsare necessaryto tune the mod-elingofthesecontributionsinMonteCarlo(MC)eventgenerators, andasreference data to studynuclear effects in proton–nucleus

 _{E-mailaddress:cms-publication-committee-chair@cern.ch.}

and nucleus–nucleus collisions. A good understanding of inclu-sive hadron production is also important to control the pileup backgrounds,fromoverlappingproton–protoncollisionsinagiven bunchcrossing,thataffectallphysicsanalysesattheLHC.

In thisLetter, measurements ofdNch/dη inthe range |η|<2 are reported forinelastic proton–proton(pp) collisions delivered by the CERN LHC at a center-of-mass energy of 13 TeV in June 2015. The analysis is based on 11.5 million events recorded at zeromagneticfieldduringaspeciallow-intensitybeam configura-tionwith0.2–5% proton–protoninteraction probability perbunch crossing.Thisspecialrunwaspreparedbysteeringthebeamssuch thattheir transverseseparationwas±3σ atthenominalCMS in-teraction point, where σ denotes the standard deviation of the Gaussianbeamprofile.Followingearlieranalysesat√s=0.9 TeV, 2.36 TeV[1],7 TeV [2], and8 TeV [3], Nch is definedto include decayproductsofparticleswithdecaylength cτ<1 cm,where τ

isthe lifetimeoftheparticle andc is thevelocity oflight. Prod-uctsofsecondaryinteractionsareexcluded,andcontributionsfrom promptleptonsareremoved.

The data are compared to pythia8 v208 [4,5] (with the CMS underlyingeventtunes[6]:CUETP8S1andCUETP8M1,using differ-entpartondensities),andto epos LHC[7](LHCtune[8]).BothMC eventgeneratorsreproducewellthemaincharacteristicsofthe ex-perimentaldatameasuredinhadroniccollisionsatlowerenergies, andprovidepredictionsforthe√s-dependence ofhadron produc-tionobservablesusingdifferentimplementationsofthedominant

http://dx.doi.org/10.1016/j.physletb.2015.10.004

0370-2693/©2015CERNforthebenefitoftheCMSCollaboration.PublishedbyElsevierB.V.ThisisanopenaccessarticleundertheCCBYlicense (http://creativecommons.org/licenses/by/4.0/).FundedbySCOAP3_.

underlying phenomena (multiparton interactions, parton satura-tion,diffractivescattering)[9,10].

2. CMSdetector

The central feature of the CMS apparatus is a superconduct-ingsolenoidof6 minternal diameter.Withinthemagnetvolume arethe siliconpixelandstrip tracker,the crystalelectromagnetic calorimeter,andthebrassandscintillatorhadroncalorimeter.The tracker measures charged particles within |η|<2.4. It has 1440 silicon pixel and 15 148 silicon strip detector modules, arranged in14trackinglayers. Thebarrelregionofthe CMSpixeldetector consistsofthree layers very closetothe beamline. Theyare lo-cated at average radii of 4.3 cm (layer 1), 7.2 cm (layer 2), and 11.0 cm (layer 3), and provide excellent position resolution with their150 μm×100 μm pixels.Thedatasampleusedforthis analy-siswasobtainedwhilethemagnetwasoff.Undertheseconditions, charged particles follow approximately straight trajectories, per-turbedmostlybymultipleCoulombscattering.Thepixelhitsalone aresufficienttoreconstructverticesandtrackswithhighprecision andpurity.Thebeampickupfortiming(BPTX) deviceswereused totriggerthedetectorreadout.Theyarelocatedaroundthebeam pipeatadistanceof175 mfromtheinteractionpoint(IP) on ei-therside,andaredesignedtoprovidepreciseinformationonthe LHCbunchstructureandthetimingoftheincomingbeams.A de-taileddescriptionoftheCMSdetectorcanbefoundinRef.[11].

3. Eventselection

Inelasticcollisioneventsareselectedasfollows:(i)online,a co-incidenceofsignalsfrombothBPTXdevicesisrequired,indicating the presence ofboth proton bunches crossing the IP;(ii) offline, atleastonereconstructedinteractionvertexisrequired,according tothetrackletortrackvertexreconstructionmethodsdescribedin Sections4.1and4.2,respectively.Whileonlythereconstructed col-lisionvertexwiththehighestmultiplicity(primaryvertex)isused inthetrackletanalysis,allreconstructedverticesinagivenbunch crossingareprocessedforthetrackanalysis.

Astudyofnoncollidingbunchesshowsthattheabove require-mentsaresufficienttorejectallbackgroundsnotoriginatingfrom pp collisions. The probability to select events in the presence of a single (noncolliding) beamis about5×10−5 per bunch cross-ing,whilethesameprobabilityissmallerthan3×10−6 perbunch crossingin theabsenceofanybeam. Consequently,the contribu-tionofbackgroundeventsfrombeam,beamhalo,andcosmicray sourcestotheobservedyieldsisnegligible.

Theresultsarecorrectedtocorrespondtoasampleofinelastic collisions.Thecorrectionsfromthedetector-levelofflineevent se-lectiontothehadron-leveleventdefinitionsare derivedfromMC simulations with pythia8 v208 (tune CUETP8M1) and epos LHC (tune LHC), which cover a wide range of possible model ingre-dients.The detectorresponse is simulatedwith Geant4 [12] and processed through the same event reconstruction chain as colli-siondata.TheMCsimulationsareproducedwiththelocationand shapeoftheinteractionregionasextractedfromdata.

4. Dataanalysis

Theanalysisoftherecordeddataisperformedwithtwo recon-struction techniques based on hits of charged particles detected by the CMS pixel detector.While both start by searchingfor hit pairsindifferentlayersatsimilarazimuthal anglesφ,thetracklet method (using hit pairs)performs background subtractionbased on control samples in data, while the track method (using hit

triplets) minimizesbackground contributions by requiringan ad-ditionalhitinthe detector.Thisresultsinaslightlynarrower ac-cessible ηrangeforthetrackmethodascomparedtothetracklet method.Sincevariousfactors,suchasdetectoralignment,material, detectorresponse,anddependenceonMC eventgenerators, influ-encethe two techniquessomewhat differently, their final combi-nationintoasinglemeasurementprovidesamorerobustresult.

4.1. Tracklets

Trackletsarepairs ofhitsintwolayersofthesiliconpixel de-tector. Foratrackletthatisconsistentwithachargedhadronthat originates attheprimary vertex, the differencein pseudorapidity (η) and the azimuthal angle (φ) between the two hits that make up the tracklet is small.The correlation between the hits intwosiliconlayersisanalyzedtodeterminethechargedhadron dNch/dη.Thismethodiscapable ofmeasuringandcorrectingfor the combinatorialbackground anditis sensitiveto hadronswith transversemomentum pTaslowas0.04 GeV/c.

Atracklet-basedvertexfinder,asdescribedinRef.[13],isused for primary vertex reconstruction. In the first step, a hit from layer 1isselectedandamatchinghitfromlayer 2issought.Ifthe |φ|ofthehitsissmallerthan0.05,the z position withrespectto thecounterclockwise-beamdirectionofthehitsisextrapolated lin-earlyandprojectedontothebeamaxis.Thisprocedureisrepeated foreveryhitinlayer 1,andthecalculated z positions aresavedas vertex candidates.The primary vertexis determined ina second step. If the magnitudeof the difference betweenthe z positions

of any two vertex candidates is smaller than 0.12 cm, they are combinedintoavertexcluster.Thevertexclusterwiththehighest numberofassociatedvertexcandidatesisselectedastheprimary vertex,andthefinalvertex z position zv isgivenbytheaverage z positionoftheassociatedvertexcandidates.Thetypicalresolution oftheprimaryvertexz position is0.02–0.1 cm,dependingonthe number ofpixel hits. Thevertex reconstructionefficiency ishigh even forlow-multiplicityeventswithfew pixelhits, witharound 80%efficiencyforeventswith3to4hitsinlayer 1,and100% effi-ciencyforeventswithmorethan8hitsinlayer 1.

The tracklet reconstruction is a separate procedure from the vertex reconstruction.There is norequirement onthe φ ofthe hits. Instead, hitswiththe smallest|η| are paired first toform tracklets(Fig. 1,top), andnohitmaybeusedmorethanonce.In contrast to thetrack analysis, all hitsare accepted forthe track-letreconstruction,suchthattheanalysisisrelativelyinsensitiveto the cluster charge simulation. Trackletscorresponding to charged hadronsthatoriginate attheprimary vertexdisplay asharppeak atφ=0,whilethebackgroundtrackletsfromuncorrelatedpixel hits have a wide φ spectrum. Fig. 1 (bottom) showsthe com-bineddataofprimarychargedhadrons(sharp peak)andtracklets fromuncorrelatedpixelhits(widetails).Tosuppressthe combina-torialbackground,onlytrackletswith|η|<0.1 and|φ|<1 are selected.Sincethecombinatorialbackgroundisflatinφ,a side-band region 1<|φ|<2 can be defined and used to estimate its magnitude, which is then subtracted from the signal region |φ|<1 toobtaintheuncorrecteddNch/dη.Typicalvaluesofthe estimated backgroundfraction in the signal region increase with |η|from6%to25%.The ηrangeforthetrackletmethodislimited to|η|<2 toavoidalargeacceptancecorrection.

Contributionsfromsecondary particles, aswell asthetracklet acceptanceandreconstructionefficiency,havetobeaccountedfor in order to determine the chargedhadron dNch/dη distribution. Thesecorrectionfactorsarecalculatedasafunctionoftheprimary vertex z position, pseudorapidity, and tracklet multiplicity, using the pythia8 CUETP8M1tuneasareference.

Fig. 1. The η(top)and φ(bottom)distributionsofhitpairsontrackletsinthe data(squares)andfromMCsimulation(histogram).

Toaccountforthedifferencebetweentheactualpixeldetector geometryandthatusedinthesimulation,anadditionalcorrection isappliedasafunctionof η andtheprimaryvertexposition.This correctionis obtainedbytakingthe ratiobetweendataand sim-ulationofthegeometricaldistributionoftrackletsin(η, zv)bins. The size ofthis correction ranges from 0to 5%. The largest cor-rectionfactorsareassociatedwiththepresenceofinactivetracker modulesinthedata.

4.2. Tracks

Theanalysisonly usesclusterswhosewidthinthe z direction

iscompatiblewiththatofachargedparticleoriginatingfromthe nominalcollisionpoint.Thedifferencebetweenthemeasuredand thegeometricallypredictedwidthsisrequiredtobe smallerthan 5pixels.

Track findinginvolves identifyingpixel hittriplets thatfall on a straight line. All possible hit pairs are taken, the first hit from layer 1,andthesecondonefromlayer 2.Ifthedifferencebetween theirazimuthal angles φ1 andφ2 is smallerthana certain value,

φ1,2<α,they arekept forthenext step.Foreach hit pair,hits fromlayer 3thathaveasmallazimuthaldifferencewithrespectto thehitinlayer 2(|φ2,3|<α)arecollected.Inaddition,thevector joiningthehitsinthefirstandsecondlayersandthevectorjoining thehitsinthesecond andthirdlayersare requiredto havepolar angles that differ by, atmost, α (|θ12,23|<α). If multiple hits inthe third layer satisfy the conditionsabove, the one withthe

smallestφ₂2_,3+ θ₁₂2_,23 valueisselected.Thecomparisonofthe φ distributions fromsignal andbackgroundshowsthat a value of α=0.02 givesthebestsignalsignificance.

Thecoordinatesofthehitsoftheresultingtripletsare usedto perform a straight-line fit withparameters (z0, η,φ) using New-ton’smethodforminimization,where z0 isthe z coordinate ofthe pointofclosestapproachtothebeamaxis.The transverseimpact parameter d0 withrespecttothe beamaxisisfixedto 0forthis fit.Theaverage distance d from the fittedlineto thehitsis used inthedeterminationofthevertexpositiontoestimatethe uncer-taintyin z, as σz=d/sinθ.Atrackisacceptedifthestraight-line fittothehitsgivesavertexposition|z0|<20 cm.

The acceptance of the track method is |η|<1.8, slightly re-ducedcomparedtothetrackletmethod,sinceallthreepixelbarrel layers areused.According tothe samplesofpp eventsgenerated with pythia8 CUETP8M1 and epos LHC, the trackingefficiency is flatat80%intheregion |η|<1.6 owing tolossesatlow pT,and increasesto 85% for pT>0.2 GeV/c. For |η|>1.6,the efficiency fallsand ison average around 50%. The wide pT coverage down to0.05 GeV/c ensures arobustperformance andfairly insensitive behavior to variations in the pT spectrum. The rate ofduplicate tracksis belowthe percentlevel,whilethefractionof misidenti-fied tracksis intherange of2–6%, risingwithhigher |η| values. Thefractionofreconstructednonprimaryparticlesis2–3%.

Anagglomerativevertexreconstruction[14]isperformedusing thefitted(z0, σz)valuesfromthereconstructedtracks.The cluster-ing oftracksinto verticesendswhen thesmallest σz-normalized distance between vertex candidates is larger than 50. Duplicate tracksareremovedbasedontheangleenclosedbytheirdirection vectors.Ifthisangleissmallerthan0.01,theonewithalarger av-eragedistance d is removed.Verticeswithatleastthreetracksare kept, unless there isonly one vertex found in theevent. Inthat case, thereis nominimum forthenumber oftracks.Onlytracks associated with a primary vertex are used in the physics analy-sis.

Thehitsofthefinal tracksarerefittedby allowingtheimpact parameter d0 tovary.Theresultingsetofparametersisusedina three-dimensionalvertexfit,which isalsoused todetermine the locationandshapeoftheinteractionregion.AsFig. 2(top)shows, the distribution ofthe numberof reconstructed tracksin data is infairagreementwiththeMCeventgeneratorpredictionsin par-ticular at the higher multiplicities. The correction from track to charged particlemultiplicity dependson the fraction ofdetected events as well as on the distribution of high multiplicity events (notshowninthefigure).

Owingtotheexcellentvertexresolution(≈250 μm),the η res-olution is also very good. Thus, potential migrations between neighboringbinsareverysmall,andthefinalgenerator-dependent corrections are applied bin-by-bin. The measured yields in each

ηbinaremultipliedbytheratioofthenumberofsimulated pri-marychargedhadronstothenumberofthereconstructedtracks.

The performance of vertexing in simulation and in data was compared bydetermining theprobability ofreconstructing k

ver-tices in case of n =1,2, and 3 simultaneous pp collisions. The extracted p(k|n) conditional probabilities are used to estimate the average inelastic interaction probability μ per bunch cross-ing by assuming a Poissonian distribution for n. While pythia8 CUETP8M1 gives μ =0.0525±0.0003(stat), epos LHC leads to 0.0545±0.0002(stat). Taking their average as the central value and the difference as the systematic uncertainty, we estimate

μ=0.0535±0.0013(syst). The product of the number of ana-lyzedbunchcrossingsand μgivesthenumberofinelasticcollision events, to be used for the calculation of the final dNch/dη val-ues.

Fig. 2. (Top)Distributionsofthe numberofreconstructedtrackspereventfrom dataandfromsimulations,forinelasticppcollisions.(Bottom)Distributionsofthe pseudorapiditydensity(dNch/dη)ofchargedhadronsintheregion|η| <2 for

in-elasticcollisionevents,reconstructedusingtracklets(opencircles),andtracks(open squares), comparedto pythia8 CUETP8M1 and epos LHC predictions,shown as dashedanddottedcurves,respectively.Thesolidandlong-dashedlines encompass-ingthedatapointsindicatethesystematicuncertaintiesofthetworeconstruction methods.

4.3. Systematic uncertainties

The systematic uncertainties in the final physics result come fromseveral sources. According to the two MC eventgenerators used,thetworeconstruction techniquesdetect about86–89%(for thetrackletmethod)and86–90%(forthetrackmethod)ofthe in-elasticppevents.Theuncertaintyinthenumberofunseen,mostly single-diffractive,collisions contributes about3% tothe total sys-tematicuncertainty.

The systematic uncertainties in the tracklet method take into account the effects of the amount of noise in the pixel hits (1–3%),detector misalignment, pixelhit reconstruction efficiency, andclustersplitting(allbelow1%).Thetracklet-to-hadron correc-tion shows a 2–3% dependence on the choice of the MC event generator.Thetotalsystematicuncertaintyofthetrackletmethod isintherange3–4%.

For the track method, requiring three hits on a straight line greatly reducesthe effects ofpixel noise andcluster splitting.In addition, hits with cluster shapes that are not compatible with theirpositions areexcludedfromtheanalysis,andtracksclosein (η,φ) are cleanedasdescribed inSection 4.2.The lossofany of the three hits because of pixel reconstruction inefficiency would

leadtothelossofthetriplet,resultinginasystematicuncertainty of1.8% fromthetrackingefficiency, independentofthechoice of the MC event generator. The effect of detector misalignment on the angular distributions is several orders of magnitude smaller thanthevaluesoftheselectioncriteria,andisthereforeneglected. The sensitivitytothevertexingefficiencyisincludedin the2–3% systematicuncertainty associatedwiththe estimate of μ, as dis-cussed inSection 4.2.Uncertainties ontrack-levelcorrections are estimatedfromthedifferencesobtainedusingthetwoMC genera-tors,andareatthelevelof2–3%.Thetotalsystematicuncertainty ofthetrackmethodisintherangeof3–4%.

Thetrackanalysiswasalsoperformedusingonlymatchedhits ofdouble-sidedmodulesinthestriptracker.Theresultis compat-ible with that fromthe pixel-onlyanalysiswithin thesystematic uncertainties. Because of thelarger correctionsand themore re-stricted|η|range,theresultwiththestriptrackerisnotincluded inthefinalcombination.

Finally, we also used the method of counting reconstructed pixel hits, as described in Ref. [2], which is subject to differ-entbackgroundandsystematiceffects,andthemeasurements are within thesystematicuncertaintiesoftheresultsreportedinthis Letter.

5. Results

Forthetrackletanalysis, allrecordedbunchcrossingsareused (about 170 000collision events),while forthetrackanalysisonly 1 million of them are used(about 55 000 collision events).After corrections,theagreementbetweenthetrackletandtrackdNch/dη resultsisbetterthan2%atcentralpseudorapidityandbetterthan 3%atforwardpseudorapidities,asshowninFig. 2(bottom).Hence, averaging their dNch/dη values is justified. Since the systematic uncertaintiesdominateandaremostlycorrelatedbetweenthetwo analyses, the simple mean of the central values and of system-atic uncertainties are taken. Thefractionof primary charged lep-tonsis≈1%ofthetotallong-livedchargedparticlesproduced,and the correctionfromdetector-leveltrackletsandtracksisdone for chargedhadronsonly.

Pseudorapiditydensitydistributions ofchargedhadronsinthe region|η|<2 forinelasticppeventsareshowninFig. 3(top).The datapointsanduncertaintiesaresymmetrizedin±η.Intherange |η|<0.5 the average pseudorapiditydensity isdNch/dη||η|<0.5= 5.49±0.01(stat)±0.17(syst). While the predictions of both pythia8(withCUETP8S1andCUETP8M1)and epos LHCagreewith themeasuredcentralvalue,themeasureddNch/dηdistributionin the full η rangeisbetter describedby thelatter.The uncertainty band of pythia8 corresponds totheenvelopeoftheuncertainties of the tune parameters of CUETP8S1; the epos LHC predictions havenouncertaintyassociatedwithitsparametersettings.

Thecenter-of-massenergydependenceofdNch/dηisshownin

Fig. 3(bottom).Forcomparisonwiththe√s=13 TeV results pre-sentedinthisLetter,inelasticppmeasurements atlowerenergies (ISR [15,16], UA5 [17,18],PHOBOS [19], andALICE[20]) are also plotted.Themeasuredvaluesareempiricallyfittedusinga second-order polynomial in ln(s) as 1.55−0.113ln(s)+0.0168ln(s)2, where s has the units GeV2, which provides a good description of theavailable dataover thefull energyrange.The pythia8 and epos_{LHCeventgeneratorsgloballyreproducethecollision-energy} dependenceofhadronproductionininelasticppcollisions.

6. Summary

The pseudorapidity distribution of charged hadrons has been measuredbytheCMSexperiment,operatedatzeromagneticfield, attheLHCinproton–protoncollisions at√s=13 TeV.Using two

Fig. 3. (Top)Distributionsofthepseudorapiditydensityofchargedhadronsinthe region|η| <2 ininelasticppcollisionsat13 TeVmeasured indata(solid mark-ers,combinedtrackandtrackletresults,symmetrizedin η),andpredictedbythe pythia8CUETP8S1andthe epos LHCeventgenerators(curves).Thegreyshaded areaencompassingthedatapointsindicatestheircorrelatedsystematic uncertain-ties.ThebluebandcorrespondstotheenvelopeoftheCUETP8S1tuneparametric uncertainties.(Bottom)Center-of-mass energydependence ofdNch/dη||η|<0.5

in-cludingISR[15,16],UA5[17,18],PHOBOS[19],andALICE[20]data.Thesolidcurve showsasecond-orderpolynomialinln(s)fittothedatapoints,includingthenew resultat√s=13 TeV.Thedashedanddottedcurvesshowthe pythia8 CUETP8S1 and epos LHCpredictions,respectively.(Forinterpretationofthereferencestocolor inthisfigurelegend,thereaderisreferredtothewebversionofthisarticle.) methods,basedon hitpairs andstraight-linetracks inthebarrel regionoftheCMSpixeldetector,achargedhadronmultiplicity at midrapidity, dNch/dη||η|<0.5=5.49±0.01(stat)±0.17(syst), has been obtained for inelastic pp events. In the central region, the measured dNch/dη distribution is consistent with predictions of the pythia8 (withtheCMSunderlyingeventtunes CUETP8S1and CUETP8M1)and epos LHC(LHCtune)eventgenerators,whilethose inawider ηrangearebetterdescribedbythelatter.Theseresults constitutethefirstCMSmeasurementofhadronproductionatthe newcenter-of-mass energyfrontier, and provide newconstraints fortheimprovementofperturbativeandnonperturbative QCD as-pectsimplementedinhadroniceventgenerators.

Acknowledgements

WecongratulateourcolleaguesintheCERNaccelerator depart-ments for the excellent performance of the LHC and thank the technicalandadministrativestaffs atCERN andatother CMS in-stitutes for their contributions to the success of the CMS effort.

Inaddition,wegratefullyacknowledgethecomputingcentresand personneloftheWorldwideLHCComputingGridfordeliveringso effectivelythe computinginfrastructureessential to ouranalyses. Finally, we acknowledge the enduring support for the construc-tionandoperation oftheLHC andtheCMSdetectorprovidedby thefollowingfundingagencies:BMWFWandFWF(Austria);FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES(Bulgaria);CERN;CAS,MOST,andNSFC(China);COLCIENCIAS (Colombia);MSESandCSF(Croatia);RPF(Cyprus);MoER,ERCIUT andERDF(Estonia);Academy ofFinland,MEC,andHIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV, CONACYT,SEP,andUASLP-FAI(Mexico);MBIE(NewZealand);PAEC (Pakistan);MSHEandNSC (Poland);FCT(Portugal);JINR(Dubna); MON,RosAtom,RASandRFBR(Russia);MESTD(Serbia);SEIDIand CPAN(Spain);SwissFundingAgencies(Switzerland);MST(Taipei); ThEPCenter,IPST, STARandNSTDA(Thailand);TUBITAKandTAEK (Turkey);NASUandSFFR(Ukraine); STFC(United Kingdom);DOE andNSF(USA).

Individuals have received support from the Marie-Curie pro-grammeand theEuropean Research CouncilandEPLANET (Euro-peanUnion);theLeventisFoundation;theAlfredP.Sloan Founda-tion; the Alexander von Humboldt Foundation; the Belgian Fed-eral Science Policy Office; the Fonds pour la Formation à la Recherchedansl’Industrieetdansl’Agriculture(FRIA-Belgium);the AgentschapvoorInnovatiedoorWetenschapenTechnologie (IWT-Belgium); theMinistry ofEducation, YouthandSports (MEYS) of theCzechRepublic;theCouncilofScienceandIndustrialResearch, India;theHOMINGPLUSprogrammeoftheFoundation forPolish Science, cofinanced from European Union, Regional Development Fund;the CompagniadiSan Paolo(Torino); the Consorzioper la Fisica (Trieste); MIURproject20108T4XTM (Italy);the Thalisand Aristeia programmes cofinanced by EU-ESF andthe Greek NSRF; the National Priorities Research Program by Qatar National Re-search Fund;theRachadapisekSompot FundforPostdoctoral Fel-lowship,ChulalongkornUniversity(Thailand);andtheWelch Foun-dation.

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CMSCollaboration

V. Khachatryan,A.M. Sirunyan, A. Tumasyan YerevanPhysicsInstitute,Yerevan,Armenia

W. Adam, E. Asilar,T. Bergauer, J. Brandstetter, E. Brondolin,M. Dragicevic, J. Erö,M. Flechl, M. Friedl, R. Frühwirth1,V.M. Ghete, C. Hartl, N. Hörmann, J. Hrubec, M. Jeitler1, V. Knünz,A. König,

M. Krammer1,I. Krätschmer, D. Liko,T. Matsushita, I. Mikulec,D. Rabady2, B. Rahbaran,H. Rohringer, J. Schieck1,R. Schöfbeck, J. Strauss, W. Treberer-Treberspurg,W. Waltenberger, C.-E. Wulz1

InstitutfürHochenergiephysikderOeAW,Wien,Austria

V. Mossolov,N. Shumeiko, J. Suarez Gonzalez NationalCentreforParticleandHighEnergyPhysics,Minsk,Belarus

S. Alderweireldt, T. Cornelis,E.A. De Wolf, X. Janssen,A. Knutsson, J. Lauwers,S. Luyckx, M. Van De Klundert,H. Van Haevermaet, P. Van Mechelen,N. Van Remortel, A. Van Spilbeeck UniversiteitAntwerpen,Antwerpen,Belgium

S. Abu Zeid,F. Blekman, J. D’Hondt, N. Daci, I. De Bruyn, K. Deroover, N. Heracleous,J. Keaveney, S. Lowette,L. Moreels, A. Olbrechts,Q. Python, D. Strom, S. Tavernier, W. Van Doninck, P. Van Mulders, G.P. Van Onsem,I. Van Parijs

VrijeUniversiteitBrussel,Brussel,Belgium

P. Barria, H. Brun, C. Caillol, B. Clerbaux, G. De Lentdecker, G. Fasanella, L. Favart, A. Grebenyuk,

G. Karapostoli,T. Lenzi, A. Léonard, T. Maerschalk,A. Marinov, L. Perniè, A. Randle-conde, T. Reis,T. Seva, C. Vander Velde, P. Vanlaer, R. Yonamine,F. Zenoni, F. Zhang3

UniversitéLibredeBruxelles,Bruxelles,Belgium

K. Beernaert,L. Benucci, A. Cimmino, S. Crucy, D. Dobur, A. Fagot,G. Garcia,M. Gul, J. Mccartin, A.A. Ocampo Rios, D. Poyraz,D. Ryckbosch, S. Salva, M. Sigamani, N. Strobbe,M. Tytgat,

W. Van Driessche, E. Yazgan, N. Zaganidis GhentUniversity,Ghent,Belgium

S. Basegmez, C. Beluffi4,O. Bondu, S. Brochet, G. Bruno, A. Caudron, L. Ceard,G.G. Da Silveira, C. Delaere, D. Favart,L. Forthomme, A. Giammanco5,J. Hollar, A. Jafari,P. Jez, M. Komm, V. Lemaitre, A. Mertens, C. Nuttens, L. Perrini, A. Pin, K. Piotrzkowski,A. Popov6,L. Quertenmont, M. Selvaggi, M. Vidal Marono UniversitéCatholiquedeLouvain,Louvain-la-Neuve,Belgium

N. Beliy,G.H. Hammad UniversitédeMons,Mons,Belgium

W.L. Aldá Júnior, G.A. Alves,L. Brito,M. Correa Martins Junior, M. Hamer,C. Hensel,C. Mora Herrera, A. Moraes,M.E. Pol, P. Rebello Teles

CentroBrasileirodePesquisasFisicas,RiodeJaneiro,Brazil

E. Belchior Batista Das Chagas, W. Carvalho,J. Chinellato7, A. Custódio, E.M. Da Costa,

D. De Jesus Damiao,C. De Oliveira Martins, S. Fonseca De Souza, L.M. Huertas Guativa, H. Malbouisson, D. Matos Figueiredo,L. Mundim, H. Nogima,W.L. Prado Da Silva, A. Santoro,A. Sznajder,

E.J. Tonelli Manganote7,A. Vilela Pereira UniversidadedoEstadodoRiodeJaneiro,RiodeJaneiro,Brazil

S. Ahujaa,C.A. Bernardesb,A. De Souza Santosb, S. Dograa,T.R. Fernandez Perez Tomeia,

E.M. Gregoresb,P.G. Mercadanteb, C.S. Moona,8,S.F. Novaesa,Sandra S. Padulaa, D. Romero Abad, J.C. Ruiz Vargas

a_{UniversidadeEstadualPaulista,SãoPaulo,Brazil} b_{UniversidadeFederaldoABC,SãoPaulo,Brazil}

A. Aleksandrov, R. Hadjiiska,P. Iaydjiev, M. Rodozov, S. Stoykova, G. Sultanov, M. Vutova InstituteforNuclearResearchandNuclearEnergy,Sofia,Bulgaria

A. Dimitrov,I. Glushkov, L. Litov, B. Pavlov,P. Petkov UniversityofSofia,Sofia,Bulgaria

M. Ahmad, J.G. Bian, G.M. Chen,H.S. Chen, M. Chen, T. Cheng,R. Du, C.H. Jiang, R. Plestina9, F. Romeo, S.M. Shaheen,J. Tao, C. Wang, Z. Wang, H. Zhang

InstituteofHighEnergyPhysics,Beijing,China

C. Asawatangtrakuldee, Y. Ban,Q. Li, S. Liu, Y. Mao,S.J. Qian, D. Wang, Z. Xu StateKeyLaboratoryofNuclearPhysicsandTechnology,PekingUniversity,Beijing,China

C. Avila,A. Cabrera, L.F. Chaparro Sierra, C. Florez,J.P. Gomez, B. Gomez Moreno, J.C. Sanabria UniversidaddeLosAndes,Bogota,Colombia

N. Godinovic, D. Lelas,I. Puljak, P.M. Ribeiro Cipriano

UniversityofSplit,FacultyofElectricalEngineering,MechanicalEngineeringandNavalArchitecture,Split,Croatia Z. Antunovic,M. Kovac

UniversityofSplit,FacultyofScience,Split,Croatia

V. Brigljevic,K. Kadija, J. Luetic,S. Micanovic, L. Sudic InstituteRudjerBoskovic,Zagreb,Croatia

A. Attikis, G. Mavromanolakis,J. Mousa, C. Nicolaou, F. Ptochos,P.A. Razis, H. Rykaczewski UniversityofCyprus,Nicosia,Cyprus

M. Bodlak,M. Finger10, M. Finger Jr.10 CharlesUniversity,Prague,CzechRepublic

Y. Assran11, M. El Sawy12,13,S. Elgammal13, A. Ellithi Kamel14,M. Kamel15,M.A. Mahmoud15, Y. Mohammed15

AcademyofScientificResearchandTechnologyoftheArabRepublicofEgypt,EgyptianNetworkofHighEnergyPhysics,Cairo,Egypt B. Calpas, M. Kadastik, M. Murumaa, M. Raidal, A. Tiko, C. Veelken

NationalInstituteofChemicalPhysicsandBiophysics,Tallinn,Estonia P. Eerola, J. Pekkanen,M. Voutilainen DepartmentofPhysics,UniversityofHelsinki,Helsinki,Finland

J. Härkönen,V. Karimäki, R. Kinnunen, T. Lampén, K. Lassila-Perini,S. Lehti, T. Lindén, P. Luukka, T. Mäenpää,T. Peltola, E. Tuominen,J. Tuominiemi, E. Tuovinen,L. Wendland

HelsinkiInstituteofPhysics,Helsinki,Finland J. Talvitie, T. Tuuva

LappeenrantaUniversityofTechnology,Lappeenranta,Finland

M. Besancon, F. Couderc,M. Dejardin, D. Denegri, B. Fabbro,J.L. Faure, C. Favaro,F. Ferri, S. Ganjour, A. Givernaud, P. Gras, G. Hamel de Monchenault, P. Jarry,E. Locci, M. Machet, J. Malcles,J. Rander, A. Rosowsky, M. Titov, A. Zghiche

DSM/IRFU,CEA/Saclay,Gif-sur-Yvette,France

I. Antropov, S. Baffioni, F. Beaudette, P. Busson, L. Cadamuro, E. Chapon, C. Charlot, T. Dahms, O. Davignon,N. Filipovic, A. Florent, R. Granier de Cassagnac, S. Lisniak,L. Mastrolorenzo, P. Miné, I.N. Naranjo, M. Nguyen,C. Ochando, G. Ortona, P. Paganini, P. Pigard,S. Regnard, R. Salerno, J.B. Sauvan, Y. Sirois, T. Strebler, Y. Yilmaz,A. Zabi

LaboratoireLeprince-Ringuet,EcolePolytechnique,IN2P3–CNRS,Palaiseau,France

J.-L. Agram16, J. Andrea, A. Aubin, D. Bloch,J.-M. Brom, M. Buttignol,E.C. Chabert, N. Chanon, C. Collard, E. Conte16, X. Coubez, J.-C. Fontaine16,D. Gelé, U. Goerlach,C. Goetzmann, A.-C. Le Bihan, J.A. Merlin2, K. Skovpen, P. Van Hove

InstitutPluridisciplinaireHubertCurien,UniversitédeStrasbourg,UniversitédeHauteAlsaceMulhouse,CNRS/IN2P3,Strasbourg,France S. Gadrat

CentredeCalculdel’InstitutNationaldePhysiqueNucleaireetdePhysiquedesParticules,CNRS/IN2P3,Villeurbanne,France

S. Beauceron,C. Bernet, G. Boudoul, E. Bouvier, C.A. Carrillo Montoya, R. Chierici,D. Contardo, B. Courbon, P. Depasse, H. El Mamouni, J. Fan, J. Fay, S. Gascon, M. Gouzevitch, B. Ille, F. Lagarde, I.B. Laktineh,M. Lethuillier, L. Mirabito,A.L. Pequegnot, S. Perries, J.D. Ruiz Alvarez,D. Sabes, L. Sgandurra,V. Sordini, M. Vander Donckt, P. Verdier, S. Viret

UniversitédeLyon,UniversitéClaudeBernardLyon1,CNRS–IN2P3,InstitutdePhysiqueNucléairedeLyon,Villeurbanne,France T. Toriashvili17

GeorgianTechnicalUniversity,Tbilisi,Georgia Z. Tsamalaidze10

TbilisiStateUniversity,Tbilisi,Georgia

C. Autermann, S. Beranek,M. Edelhoff,L. Feld, A. Heister, M.K. Kiesel, K. Klein, M. Lipinski, A. Ostapchuk, M. Preuten,F. Raupach, S. Schael,J.F. Schulte, T. Verlage,H. Weber, B. Wittmer, V. Zhukov6

M. Ata, M. Brodski,E. Dietz-Laursonn, D. Duchardt, M. Endres,M. Erdmann, S. Erdweg, T. Esch, R. Fischer,A. Güth, T. Hebbeker,C. Heidemann, K. Hoepfner, D. Klingebiel,S. Knutzen, P. Kreuzer, M. Merschmeyer,A. Meyer, P. Millet,M. Olschewski, K. Padeken, P. Papacz,T. Pook, M. Radziej, H. Reithler,M. Rieger, F. Scheuch,L. Sonnenschein, D. Teyssier, S. Thüer

RWTHAachenUniversity,III.PhysikalischesInstitutA,Aachen,Germany

V. Cherepanov, Y. Erdogan,G. Flügge, H. Geenen, M. Geisler, F. Hoehle, B. Kargoll, T. Kress, Y. Kuessel, A. Künsken,J. Lingemann2,A. Nehrkorn, A. Nowack, I.M. Nugent,C. Pistone, O. Pooth,A. Stahl

RWTHAachenUniversity,III.PhysikalischesInstitutB,Aachen,Germany

M. Aldaya Martin,I. Asin, N. Bartosik, O. Behnke,U. Behrens, A.J. Bell,K. Borras18, A. Burgmeier, A. Cakir,L. Calligaris, A. Campbell,S. Choudhury, P. Connor, F. Costanza, C. Diez Pardos,G. Dolinska, S. Dooling,T. Dorland,G. Eckerlin, D. Eckstein, T. Eichhorn, G. Flucke, E. Gallo19,J. Garay Garcia, A. Geiser,A. Gizhko, J.M. Grados Luyando,P. Gunnellini, J. Hauk, M. Hempel20,H. Jung,

A. Kalogeropoulos,O. Karacheban20,M. Kasemann, P. Katsas, J. Kieseler, C. Kleinwort, I. Korol,W. Lange, J. Leonard,K. Lipka, A. Lobanov,W. Lohmann20,R. Mankel, I. Marfin20, I.-A. Melzer-Pellmann,

A.B. Meyer, G. Mittag, J. Mnich, A. Mussgiller, S. Naumann-Emme,A. Nayak, E. Ntomari,H. Perrey, D. Pitzl,R. Placakyte, A. Raspereza, B. Roland,M.Ö. Sahin, P. Saxena,T. Schoerner-Sadenius,M. Schröder, C. Seitz,S. Spannagel, K.D. Trippkewitz, R. Walsh, C. Wissing

DeutschesElektronen-Synchrotron,Hamburg,Germany

V. Blobel, M. Centis Vignali, A.R. Draeger,J. Erfle, E. Garutti,K. Goebel, D. Gonzalez, M. Görner,J. Haller, M. Hoffmann,R.S. Höing,A. Junkes, R. Klanner, R. Kogler, T. Lapsien, T. Lenz, I. Marchesini,D. Marconi, M. Meyer,D. Nowatschin, J. Ott, F. Pantaleo2, T. Peiffer, A. Perieanu, N. Pietsch,J. Poehlsen,D. Rathjens, C. Sander,H. Schettler, P. Schleper, E. Schlieckau, A. Schmidt, J. Schwandt,M. Seidel, V. Sola, H. Stadie, G. Steinbrück, H. Tholen,D. Troendle, E. Usai, L. Vanelderen,A. Vanhoefer, B. Vormwald

UniversityofHamburg,Hamburg,Germany

M. Akbiyik, C. Barth, C. Baus,J. Berger,C. Böser, E. Butz, T. Chwalek, F. Colombo, W. De Boer, A. Descroix, A. Dierlamm,S. Fink, F. Frensch, M. Giffels,A. Gilbert, F. Hartmann2, S.M. Heindl,U. Husemann,

I. Katkov6,A. Kornmayer2,P. Lobelle Pardo, B. Maier, H. Mildner, M.U. Mozer,T. Müller, Th. Müller, M. Plagge,G. Quast, K. Rabbertz, S. Röcker, F. Roscher,H.J. Simonis, F.M. Stober,R. Ulrich,

J. Wagner-Kuhr,S. Wayand, M. Weber, T. Weiler, C. Wöhrmann, R. Wolf InstitutfürExperimentelleKernphysik,Karlsruhe,Germany

G. Anagnostou,G. Daskalakis, T. Geralis,V.A. Giakoumopoulou, A. Kyriakis, D. Loukas,A. Psallidas, I. Topsis-Giotis

InstituteofNuclearandParticlePhysics(INPP),NCSRDemokritos,AghiaParaskevi,Greece

A. Agapitos,S. Kesisoglou, A. Panagiotou,N. Saoulidou, E. Tziaferi UniversityofAthens,Athens,Greece

I. Evangelou,G. Flouris, C. Foudas, P. Kokkas, N. Loukas, N. Manthos,I. Papadopoulos, E. Paradas, J. Strologas

UniversityofIoánnina,Ioánnina,Greece

G. Bencze,C. Hajdu, A. Hazi,P. Hidas, D. Horvath21, F. Sikler,V. Veszpremi, G. Vesztergombi22, A.J. Zsigmond

WignerResearchCentreforPhysics,Budapest,Hungary

N. Beni,S. Czellar, J. Karancsi23,J. Molnar, Z. Szillasi InstituteofNuclearResearchATOMKI,Debrecen,Hungary

M. Bartók24,A. Makovec, P. Raics, Z.L. Trocsanyi,B. Ujvari UniversityofDebrecen,Debrecen,Hungary

P. Mal, K. Mandal, D.K. Sahoo, N. Sahoo,S.K. Swain NationalInstituteofScienceEducationandResearch,Bhubaneswar,India

S. Bansal, S.B. Beri,V. Bhatnagar, R. Chawla, R. Gupta,U. Bhawandeep, A.K. Kalsi,A. Kaur, M. Kaur, R. Kumar,A. Mehta, M. Mittal, J.B. Singh, G. Walia

PanjabUniversity,Chandigarh,India

Ashok Kumar, A. Bhardwaj,B.C. Choudhary, R.B. Garg,A. Kumar, S. Malhotra, M. Naimuddin,N. Nishu, K. Ranjan,R. Sharma, V. Sharma

UniversityofDelhi,Delhi,India

R. Bhardwaj,S. Bhattacharya, K. Chatterjee, S. Dey,S. Dutta, Sa. Jain, N. Majumdar, A. Modak,K. Mondal, S. Mukherjee,S. Mukhopadhyay, A. Roy, D. Roy, S. Roy Chowdhury, S. Sarkar, M. Sharan

SahaInstituteofNuclearPhysics,Kolkata,India

A. Abdulsalam, R. Chudasama, D. Dutta, V. Jha, V. Kumar, A.K. Mohanty2, L.M. Pant,P. Shukla, A. Topkar BhabhaAtomicResearchCentre,Mumbai,India

T. Aziz, S. Banerjee, S. Bhowmik25,R.M. Chatterjee, R.K. Dewanjee, S. Dugad, S. Ganguly,S. Ghosh, M. Guchait,A. Gurtu26,G. Kole, S. Kumar, B. Mahakud, M. Maity25, G. Majumder, K. Mazumdar, S. Mitra, G.B. Mohanty, B. Parida, T. Sarkar25,N. Sur, B. Sutar, N. Wickramage27

TataInstituteofFundamentalResearch,Mumbai,India S. Chauhan,S. Dube, S. Sharma

IndianInstituteofScienceEducationandResearch(IISER),Pune,India

H. Bakhshiansohi,H. Behnamian, S.M. Etesami28, A. Fahim29, R. Goldouzian, M. Khakzad,

M. Mohammadi Najafabadi, M. Naseri, S. Paktinat Mehdiabadi, F. Rezaei Hosseinabadi, B. Safarzadeh30, M. Zeinali

InstituteforResearchinFundamentalSciences(IPM),Tehran,Iran M. Felcini,M. Grunewald

UniversityCollegeDublin,Dublin,Ireland

M. Abbresciaa,b, C. Calabriaa,b,C. Caputoa,b,A. Colaleoa,D. Creanzaa,c, L. Cristellaa,b,N. De Filippisa,c, M. De Palmaa,b, L. Fiorea,G. Iasellia,c, G. Maggia,c,M. Maggia, G. Minielloa,b, S. Mya,c, S. Nuzzoa,b, A. Pompilia,b,G. Pugliesea,c,R. Radognaa,b,A. Ranieria,G. Selvaggia,b,L. Silvestrisa,2, R. Vendittia,b, P. Verwilligena

a_{INFNSezionediBari,Bari,Italy} b_{UniversitàdiBari,Bari,Italy} c_{PolitecnicodiBari,Bari,Italy}

G. Abbiendia,C. Battilana2, A.C. Benvenutia,D. Bonacorsia,b,S. Braibant-Giacomellia,b, L. Brigliadoria,b, R. Campaninia,b, P. Capiluppia,b,A. Castroa,b,F.R. Cavalloa, S.S. Chhibraa,b, G. Codispotia,b,

M. Cuffiania,b,G.M. Dallavallea,F. Fabbria,A. Fanfania,b,D. Fasanellaa,b,P. Giacomellia, C. Grandia, L. Guiduccia,b,S. Marcellinia,G. Masettia,A. Montanaria,F.L. Navarriaa,b, A. Perrottaa,A.M. Rossia,b, T. Rovellia,b,G.P. Sirolia,b,N. Tosia,b,R. Travaglinia,b

a_{INFNSezionediBologna,Bologna,Italy} b_{UniversitàdiBologna,Bologna,Italy}

G. Cappelloa,M. Chiorbolia,b,S. Costaa,b,F. Giordanoa,b, R. Potenzaa,b,A. Tricomia,b,C. Tuvea,b

a_{INFNSezionediCatania,Catania,Italy} b_{UniversitàdiCatania,Catania,Italy} c_{CSFNSM,Catania,Italy}

G. Barbaglia,V. Ciullia,b,C. Civininia, R. D’Alessandroa,b, E. Focardia,b,S. Gonzia,b,V. Goria,b, P. Lenzia,b, M. Meschinia, S. Paolettia,G. Sguazzonia,A. Tropianoa,b,L. Viliania,b

a_{INFNSezionediFirenze,Firenze,Italy} b_{UniversitàdiFirenze,Firenze,Italy}

L. Benussi,S. Bianco, F. Fabbri, D. Piccolo,F. Primavera INFNLaboratoriNazionalidiFrascati,Frascati,Italy

V. Calvellia,b, F. Ferroa, M. Lo Veterea,b, M.R. Mongea,b,E. Robuttia, S. Tosia,b

a_{INFNSezionediGenova,Genova,Italy} b_{UniversitàdiGenova,Genova,Italy}

L. Brianza,M.E. Dinardoa,b,S. Fiorendia,b,S. Gennaia, R. Gerosaa,b,A. Ghezzia,b, P. Govonia,b,

S. Malvezzia, R.A. Manzonia,b, B. Marzocchia,b,2,D. Menascea,L. Moronia,M. Paganonia,b, D. Pedrinia, S. Ragazzia,b,N. Redaellia,T. Tabarelli de Fatisa,b

a_{INFNSezionediMilano-Bicocca,Milano,Italy} b_{UniversitàdiMilano-Bicocca,Milano,Italy}

S. Buontempoa, N. Cavalloa,c,S. Di Guidaa,d,2, M. Espositoa,b, F. Fabozzia,c,A.O.M. Iorioa,b, G. Lanzaa, L. Listaa,S. Meolaa,d,2,M. Merolaa,P. Paoluccia,2,C. Sciaccaa,b,F. Thyssen

a_{INFNSezionediNapoli,Napoli,Italy} b_{UniversitàdiNapoli‘FedericoII’,Napoli,Italy} c_{UniversitàdellaBasilicata,Potenza,Italy} d_{UniversitàG.Marconi,Roma,Italy}

P. Azzia,2,N. Bacchettaa,L. Benatoa,b, D. Biselloa,b, A. Bolettia,b, A. Brancaa,b,R. Carlina,b,P. Checchiaa, M. Dall’Ossoa,b,2,T. Dorigoa, U. Dossellia,F. Gasparinia,b,U. Gasparinia,b,F. Gonellaa, A. Gozzelinoa, K. Kanishcheva,c,S. Lacapraraa, M. Margonia,b, A.T. Meneguzzoa,b,J. Pazzinia,b,N. Pozzobona,b, P. Ronchesea,b,F. Simonettoa,b, E. Torassaa, M. Tosia,b, M. Zanetti,P. Zottoa,b, A. Zucchettaa,b,2, G. Zumerlea,b

a_{INFNSezionediPadova,Padova,Italy} b_{UniversitàdiPadova,Padova,Italy} c_{UniversitàdiTrento,Trento,Italy}

A. Braghieria, A. Magnania,P. Montagnaa,b, S.P. Rattia,b,V. Rea,C. Riccardia,b,P. Salvinia, I. Vaia, P. Vituloa,b

a_{INFNSezionediPavia,Pavia,Italy} b_{UniversitàdiPavia,Pavia,Italy}

L. Alunni Solestizia,b, M. Biasinia,b, G.M. Bileia,D. Ciangottinia,b,2,L. Fanòa,b, P. Laricciaa,b, G. Mantovania,b, M. Menichellia,A. Sahaa,A. Santocchiaa,b, A. Spieziaa,b

a_{INFNSezionediPerugia,Perugia,Italy} b_{UniversitàdiPerugia,Perugia,Italy}

K. Androsova,31,P. Azzurria,G. Bagliesia,J. Bernardinia,T. Boccalia,G. Broccoloa,c,R. Castaldia, M.A. Cioccia,31_{,R. Dell’Orso}a_{, S. Donato}a,c,2_{,G. Fedi, L. Foà}a,c,†_{,A. Giassi}a_{, M.T. Grippo}a,31_,

F. Ligabuea,c,T. Lomtadzea,L. Martinia,b, A. Messineoa,b, F. Pallaa,A. Rizzia,b,A. Savoy-Navarroa,32, A.T. Serbana, P. Spagnoloa,P. Squillaciotia,31, R. Tenchinia,G. Tonellia,b, A. Venturia, P.G. Verdinia

a_{INFNSezionediPisa,Pisa,Italy} b_{UniversitàdiPisa,Pisa,Italy}

L. Baronea,b,F. Cavallaria, G. D’imperioa,b,2, D. Del Rea,b,M. Diemoza,S. Gellia,b,C. Jordaa, E. Longoa,b, F. Margarolia,b,P. Meridiania,G. Organtinia,b, R. Paramattia,F. Preiatoa,b, S. Rahatloua,b, C. Rovellia, F. Santanastasioa,b, P. Traczyka,b,2

a_{INFNSezionediRoma,Roma,Italy} b_{UniversitàdiRoma,Roma,Italy}

N. Amapanea,b, R. Arcidiaconoa,c,2, S. Argiroa,b, M. Arneodoa,c, R. Bellana,b, C. Biinoa,N. Cartigliaa, M. Costaa,b,R. Covarellia,b, A. Deganoa,b, N. Demariaa,L. Fincoa,b,2, B. Kiania,b,C. Mariottia, S. Masellia, E. Migliorea,b,V. Monacoa,b,E. Monteila,b,M. Musicha, M.M. Obertinoa,b,L. Pachera,b, N. Pastronea,M. Pelliccionia, G.L. Pinna Angionia,b,F. Raveraa,b,A. Romeroa,b,M. Ruspaa,c, R. Sacchia,b, A. Solanoa,b, A. Staianoa, U. Tamponia

a_{INFNSezionediTorino,Torino,Italy} b_{UniversitàdiTorino,Torino,Italy}

c_{UniversitàdelPiemonteOrientale,Novara,Italy}

S. Belfortea,V. Candelisea,b,2, M. Casarsaa,F. Cossuttia, G. Della Riccaa,b,B. Gobboa,C. La Licataa,b, M. Maronea,b,A. Schizzia,b, A. Zanettia

a_{INFNSezionediTrieste,Trieste,Italy} b_{UniversitàdiTrieste,Trieste,Italy}

A. Kropivnitskaya,S.K. Nam KangwonNationalUniversity,Chunchon,RepublicofKorea

D.H. Kim,G.N. Kim, M.S. Kim,D.J. Kong, S. Lee, Y.D. Oh,A. Sakharov, D.C. Son KyungpookNationalUniversity,Daegu,RepublicofKorea

J.A. Brochero Cifuentes, H. Kim,T.J. Kim ChonbukNationalUniversity,Jeonju,RepublicofKorea

S. Song

ChonnamNationalUniversity,InstituteforUniverseandElementaryParticles,Kwangju,RepublicofKorea

S. Choi, Y. Go, D. Gyun,B. Hong,M. Jo, H. Kim, Y. Kim,B. Lee, K. Lee, K.S. Lee, S. Lee,S.K. Park, Y. Roh KoreaUniversity,Seoul,RepublicofKorea

H.D. Yoo

SeoulNationalUniversity,Seoul,RepublicofKorea

M. Choi,H. Kim, J.H. Kim, J.S.H. Lee, I.C. Park, G. Ryu, M.S. Ryu UniversityofSeoul,Seoul,RepublicofKorea

Y. Choi,J. Goh, D. Kim, E. Kwon, J. Lee,I. Yu SungkyunkwanUniversity,Suwon,RepublicofKorea

A. Juodagalvis,J. Vaitkus VilniusUniversity,Vilnius,Lithuania

I. Ahmed,Z.A. Ibrahim, J.R. Komaragiri, M.A.B. Md Ali33,F. Mohamad Idris34,W.A.T. Wan Abdullah, M.N. Yusli

E. Casimiro Linares, H. Castilla-Valdez,E. De La Cruz-Burelo, I. Heredia-De La Cruz35, A. Hernandez-Almada,R. Lopez-Fernandez, A. Sanchez-Hernandez

CentrodeInvestigacionydeEstudiosAvanzadosdelIPN,MexicoCity,Mexico S. Carrillo Moreno, F. Vazquez Valencia UniversidadIberoamericana,MexicoCity,Mexico

I. Pedraza, H.A. Salazar Ibarguen BenemeritaUniversidadAutonomadePuebla,Puebla,Mexico A. Morelos Pineda

UniversidadAutónomadeSanLuisPotosí,SanLuisPotosí,Mexico D. Krofcheck

UniversityofAuckland,Auckland,NewZealand P.H. Butler

UniversityofCanterbury,Christchurch,NewZealand

A. Ahmad, M. Ahmad, Q. Hassan,H.R. Hoorani, W.A. Khan,T. Khurshid, M. Shoaib NationalCentreforPhysics,Quaid-I-AzamUniversity,Islamabad,Pakistan

H. Bialkowska,M. Bluj, B. Boimska,T. Frueboes, M. Górski, M. Kazana, K. Nawrocki, K. Romanowska-Rybinska,M. Szleper, P. Zalewski

NationalCentreforNuclearResearch,Swierk,Poland

G. Brona,K. Bunkowski, A. Byszuk36,K. Doroba, A. Kalinowski, M. Konecki, J. Krolikowski, M. Misiura, M. Olszewski,M. Walczak

InstituteofExperimentalPhysics,FacultyofPhysics,UniversityofWarsaw,Warsaw,Poland

P. Bargassa,C. Beirão Da Cruz E Silva, A. Di Francesco, P. Faccioli,P.G. Ferreira Parracho, M. Gallinaro, N. Leonardo,L. Lloret Iglesias, F. Nguyen, J. Rodrigues Antunes, J. Seixas,O. Toldaiev, D. Vadruccio, J. Varela, P. Vischia

LaboratóriodeInstrumentaçãoeFísicaExperimentaldePartículas,Lisboa,Portugal

S. Afanasiev,P. Bunin,M. Gavrilenko,I. Golutvin, I. Gorbunov, A. Kamenev,V. Karjavin, V. Konoplyanikov, A. Lanev,A. Malakhov,V. Matveev37, P. Moisenz, V. Palichik,V. Perelygin, S. Shmatov, S. Shulha,

N. Skatchkov,V. Smirnov, A. Zarubin JointInstituteforNuclearResearch,Dubna,Russia

V. Golovtsov,Y. Ivanov, V. Kim38,E. Kuznetsova, P. Levchenko, V. Murzin, V. Oreshkin, I. Smirnov, V. Sulimov,L. Uvarov, S. Vavilov, A. Vorobyev

PetersburgNuclearPhysicsInstitute,Gatchina(St.Petersburg),Russia

Yu. Andreev,A. Dermenev,S. Gninenko, N. Golubev, A. Karneyeu, M. Kirsanov,N. Krasnikov, A. Pashenkov,D. Tlisov, A. Toropin

InstituteforNuclearResearch,Moscow,Russia

V. Epshteyn,V. Gavrilov, N. Lychkovskaya,V. Popov, I. Pozdnyakov,G. Safronov, A. Spiridonov, E. Vlasov, A. Zhokin

A. Bylinkin

NationalResearchNuclearUniversity‘MoscowEngineeringPhysicsInstitute’(MEPhI),Moscow,Russia

V. Andreev,M. Azarkin39, I. Dremin39,M. Kirakosyan, A. Leonidov39, G. Mesyats,S.V. Rusakov P.N.LebedevPhysicalInstitute,Moscow,Russia

A. Baskakov,A. Belyaev, E. Boos,A. Ershov, A. Gribushin, L. Khein, V. Klyukhin, O. Kodolova,I. Lokhtin, O. Lukina, I. Myagkov, S. Obraztsov,S. Petrushanko,V. Savrin, A. Snigirev

SkobeltsynInstituteofNuclearPhysics,LomonosovMoscowStateUniversity,Moscow,Russia

I. Azhgirey,I. Bayshev,S. Bitioukov, V. Kachanov, A. Kalinin, D. Konstantinov, V. Krychkine, V. Petrov, R. Ryutin, A. Sobol, L. Tourtchanovitch,S. Troshin, N. Tyurin, A. Uzunian,A. Volkov

StateResearchCenterofRussianFederation,InstituteforHighEnergyPhysics,Protvino,Russia P. Adzic40, J. Milosevic,V. Rekovic

UniversityofBelgrade,FacultyofPhysicsandVincaInstituteofNuclearSciences,Belgrade,Serbia

J. Alcaraz Maestre, E. Calvo,M. Cerrada,M. Chamizo Llatas, N. Colino, B. De La Cruz,A. Delgado Peris, D. Domínguez Vázquez, A. Escalante Del Valle, C. Fernandez Bedoya,J.P. Fernández Ramos, J. Flix, M.C. Fouz,P. Garcia-Abia, O. Gonzalez Lopez,S. Goy Lopez, J.M. Hernandez, M.I. Josa,

E. Navarro De Martino,A. Pérez-Calero Yzquierdo, J. Puerta Pelayo, A. Quintario Olmeda, I. Redondo, L. Romero,J. Santaolalla, M.S. Soares

CentrodeInvestigacionesEnergéticasMedioambientalesyTecnológicas(CIEMAT),Madrid,Spain C. Albajar, J.F. de Trocóniz, M. Missiroli, D. Moran UniversidadAutónomadeMadrid,Madrid,Spain

J. Cuevas, J. Fernandez Menendez,S. Folgueras, I. Gonzalez Caballero, E. Palencia Cortezon, J.M. Vizan Garcia

UniversidaddeOviedo,Oviedo,Spain

I.J. Cabrillo, A. Calderon, J.R. Castiñeiras De Saa, P. De Castro Manzano, J. Duarte Campderros, M. Fernandez,J. Garcia-Ferrero, G. Gomez, A. Lopez Virto,J. Marco, R. Marco, C. Martinez Rivero, F. Matorras, F.J. Munoz Sanchez,J. Piedra Gomez, T. Rodrigo, A.Y. Rodríguez-Marrero, A. Ruiz-Jimeno, L. Scodellaro,I. Vila, R. Vilar Cortabitarte

InstitutodeFísicadeCantabria(IFCA),CSIC-UniversidaddeCantabria,Santander,Spain

D. Abbaneo, E. Auffray, G. Auzinger, M. Bachtis,P. Baillon, A.H. Ball, D. Barney, A. Benaglia, J. Bendavid, L. Benhabib,J.F. Benitez, G.M. Berruti, P. Bloch,A. Bocci, A. Bonato,C. Botta, H. Breuker, T. Camporesi, R. Castello,G. Cerminara, M. D’Alfonso, D. d’Enterria, A. Dabrowski,V. Daponte, A. David,M. De Gruttola, F. De Guio, A. De Roeck, S. De Visscher, E. Di Marco,M. Dobson, M. Dordevic, B. Dorney, T. du Pree, M. Dünser,N. Dupont, A. Elliott-Peisert,G. Franzoni, W. Funk, D. Gigi, K. Gill, D. Giordano,M. Girone, F. Glege, R. Guida, S. Gundacker, M. Guthoff,J. Hammer, P. Harris, J. Hegeman, V. Innocente, P. Janot, H. Kirschenmann,M.J. Kortelainen, K. Kousouris, K. Krajczar,P. Lecoq, C. Lourenço,M.T. Lucchini, N. Magini,L. Malgeri, M. Mannelli,A. Martelli, L. Masetti,F. Meijers, S. Mersi, E. Meschi, F. Moortgat, S. Morovic, M. Mulders, M.V. Nemallapudi,H. Neugebauer, S. Orfanelli41,L. Orsini, L. Pape, E. Perez, M. Peruzzi,A. Petrilli, G. Petrucciani, A. Pfeiffer,D. Piparo, A. Racz,G. Rolandi42,M. Rovere, M. Ruan, H. Sakulin, C. Schäfer, C. Schwick,A. Sharma,P. Silva, M. Simon, P. Sphicas43, D. Spiga,J. Steggemann, B. Stieger, M. Stoye,Y. Takahashi, D. Treille, A. Triossi, A. Tsirou,G.I. Veres22, N. Wardle, H.K. Wöhri, A. Zagozdzinska36,W.D. Zeuner

W. Bertl,K. Deiters,W. Erdmann, R. Horisberger, Q. Ingram,H.C. Kaestli, D. Kotlinski, U. Langenegger, D. Renker, T. Rohe

PaulScherrerInstitut,Villigen,Switzerland

F. Bachmair, L. Bäni, L. Bianchini, M.A. Buchmann,B. Casal, G. Dissertori, M. Dittmar, M. Donegà,P. Eller, C. Grab,C. Heidegger, D. Hits, J. Hoss,G. Kasieczka, W. Lustermann,B. Mangano,M. Marionneau,

P. Martinez Ruiz del Arbol,M. Masciovecchio, D. Meister, F. Micheli,P. Musella, F. Nessi-Tedaldi, F. Pandolfi,J. Pata, F. Pauss, L. Perrozzi,M. Quittnat, M. Rossini,A. Starodumov44, M. Takahashi, V.R. Tavolaro, K. Theofilatos,R. Wallny

InstituteforParticlePhysics,ETHZurich,Zurich,Switzerland

T.K. Aarrestad, C. Amsler45, L. Caminada,M.F. Canelli,V. Chiochia, A. De Cosa, C. Galloni,A. Hinzmann, T. Hreus,B. Kilminster, C. Lange, J. Ngadiuba,D. Pinna, P. Robmann, F.J. Ronga,D. Salerno, Y. Yang UniversitätZürich,Zurich,Switzerland

M. Cardaci,K.H. Chen, T.H. Doan, Sh. Jain,R. Khurana,M. Konyushikhin, C.M. Kuo, W. Lin,Y.J. Lu, S.S. Yu NationalCentralUniversity,Chung-Li,Taiwan

Arun Kumar, R. Bartek,P. Chang, Y.H. Chang, Y.W. Chang,Y. Chao, K.F. Chen, P.H. Chen, C. Dietz, F. Fiori, U. Grundler,W.-S. Hou,Y. Hsiung, Y.F. Liu, R.-S. Lu, M. Miñano Moya,E. Petrakou, J.f. Tsai,Y.M. Tzeng NationalTaiwanUniversity(NTU),Taipei,Taiwan

B. Asavapibhop,K. Kovitanggoon, G. Singh, N. Srimanobhas, N. Suwonjandee ChulalongkornUniversity,FacultyofScience,DepartmentofPhysics,Bangkok,Thailand

A. Adiguzel, S. Cerci46,Z.S. Demiroglu,C. Dozen, S. Girgis, G. Gokbulut, Y. Guler, E. Gurpinar,I. Hos, E.E. Kangal47,A. Kayis Topaksu, G. Onengut48,K. Ozdemir49, S. Ozturk50, B. Tali46,H. Topakli50, M. Vergili,C. Zorbilmez

CukurovaUniversity,Adana,Turkey

I.V. Akin,B. Bilin, S. Bilmis, B. Isildak51,G. Karapinar52,M. Yalvac, M. Zeyrek MiddleEastTechnicalUniversity,PhysicsDepartment,Ankara,Turkey

E.A. Albayrak53, E. Gülmez,M. Kaya54,O. Kaya55, T. Yetkin56 BogaziciUniversity,Istanbul,Turkey

K. Cankocak,S. Sen57, F.I. Vardarlı IstanbulTechnicalUniversity,Istanbul,Turkey

B. Grynyov

InstituteforScintillationMaterialsofNationalAcademyofScienceofUkraine,Kharkov,Ukraine L. Levchuk,P. Sorokin

NationalScientificCenter,KharkovInstituteofPhysicsandTechnology,Kharkov,Ukraine

R. Aggleton,F. Ball, L. Beck, J.J. Brooke, E. Clement, D. Cussans,H. Flacher, J. Goldstein,M. Grimes, G.P. Heath, H.F. Heath,J. Jacob, L. Kreczko, C. Lucas, Z. Meng, D.M. Newbold58, S. Paramesvaran,A. Poll, T. Sakuma,S. Seif El Nasr-storey, S. Senkin, D. Smith,V.J. Smith

D. Barducci,K.W. Bell, A. Belyaev59,C. Brew, R.M. Brown, D. Cieri, D.J.A. Cockerill, J.A. Coughlan,

K. Harder, S. Harper, E. Olaiya,D. Petyt, C.H. Shepherd-Themistocleous, A. Thea, I.R. Tomalin, T. Williams, W.J. Womersley, S.D. Worm

RutherfordAppletonLaboratory,Didcot,UnitedKingdom

M. Baber, R. Bainbridge,O. Buchmuller, A. Bundock, D. Burton,S. Casasso,M. Citron, D. Colling, L. Corpe, N. Cripps,P. Dauncey, G. Davies, A. De Wit, M. Della Negra, P. Dunne,A. Elwood, W. Ferguson, J. Fulcher, D. Futyan,G. Hall, G. Iles, M. Kenzie, R. Lane,R. Lucas58,L. Lyons,A.-M. Magnan, S. Malik, J. Nash, A. Nikitenko44,J. Pela, M. Pesaresi, K. Petridis, D.M. Raymond, A. Richards,A. Rose,C. Seez, A. Tapper, K. Uchida, M. Vazquez Acosta60, T. Virdee,S.C. Zenz

ImperialCollege,London,UnitedKingdom

J.E. Cole, P.R. Hobson, A. Khan,P. Kyberd, D. Leggat,D. Leslie, I.D. Reid, P. Symonds, L. Teodorescu, M. Turner

BrunelUniversity,Uxbridge,UnitedKingdom

A. Borzou,K. Call,J. Dittmann, K. Hatakeyama, A. Kasmi, H. Liu,N. Pastika BaylorUniversity,Waco,USA

O. Charaf,S.I. Cooper, C. Henderson, P. Rumerio TheUniversityofAlabama,Tuscaloosa,USA

A. Avetisyan, T. Bose,C. Fantasia, D. Gastler, P. Lawson, D. Rankin, C. Richardson,J. Rohlf, J. St. John, L. Sulak,D. Zou

BostonUniversity,Boston,USA

J. Alimena,E. Berry, S. Bhattacharya, D. Cutts, N. Dhingra, A. Ferapontov, A. Garabedian,J. Hakala, U. Heintz, E. Laird,G. Landsberg, Z. Mao, M. Narain, S. Piperov, S. Sagir,T. Sinthuprasith, R. Syarif BrownUniversity,Providence,USA

R. Breedon,G. Breto, M. Calderon De La Barca Sanchez, S. Chauhan,M. Chertok, J. Conway,R. Conway, P.T. Cox, R. Erbacher,M. Gardner, W. Ko, R. Lander,M. Mulhearn, D. Pellett, J. Pilot, F. Ricci-Tam, S. Shalhout, J. Smith, M. Squires, D. Stolp, M. Tripathi, S. Wilbur,R. Yohay

UniversityofCalifornia,Davis,Davis,USA

R. Cousins, P. Everaerts, C. Farrell,J. Hauser, M. Ignatenko, D. Saltzberg, E. Takasugi, V. Valuev, M. Weber UniversityofCalifornia,LosAngeles,USA

K. Burt, R. Clare,J. Ellison, J.W. Gary, G. Hanson,J. Heilman, M. Ivova PANEVA, P. Jandir, E. Kennedy, F. Lacroix,O.R. Long, A. Luthra, M. Malberti, M. Olmedo Negrete, A. Shrinivas,H. Wei, S. Wimpenny, B.R. Yates

UniversityofCalifornia,Riverside,Riverside,USA

J.G. Branson, G.B. Cerati,S. Cittolin, R.T. D’Agnolo, A. Holzner, R. Kelley, D. Klein, J. Letts, I. Macneill, D. Olivito, S. Padhi, M. Pieri, M. Sani,V. Sharma, S. Simon, M. Tadel,A. Vartak, S. Wasserbaech61, C. Welke,F. Würthwein,A. Yagil, G. Zevi Della Porta

UniversityofCalifornia,SanDiego,LaJolla,USA

D. Barge, J. Bradmiller-Feld, C. Campagnari, A. Dishaw, V. Dutta,K. Flowers, M. Franco Sevilla, P. Geffert, C. George, F. Golf, L. Gouskos,J. Gran, J. Incandela, C. Justus,N. Mccoll, S.D. Mullin, J. Richman, D. Stuart, I. Suarez,W. To, C. West,J. Yoo

D. Anderson,A. Apresyan,A. Bornheim, J. Bunn, Y. Chen, J. Duarte,A. Mott, H.B. Newman, C. Pena, M. Pierini,M. Spiropulu, J.R. Vlimant, S. Xie,R.Y. Zhu

CaliforniaInstituteofTechnology,Pasadena,USA

M.B. Andrews,V. Azzolini,A. Calamba, B. Carlson, T. Ferguson, M. Paulini, J. Russ, M. Sun, H. Vogel, I. Vorobiev

CarnegieMellonUniversity,Pittsburgh,USA

J.P. Cumalat,W.T. Ford, A. Gaz, F. Jensen, A. Johnson,M. Krohn, T. Mulholland, U. Nauenberg, K. Stenson, S.R. Wagner

UniversityofColoradoBoulder,Boulder,USA

J. Alexander, A. Chatterjee, J. Chaves,J. Chu, S. Dittmer,N. Eggert, N. Mirman, G. Nicolas Kaufman, J.R. Patterson,A. Rinkevicius, A. Ryd, L. Skinnari,L. Soffi, W. Sun, S.M. Tan,W.D. Teo, J. Thom, J. Thompson, J. Tucker,Y. Weng, P. Wittich

CornellUniversity,Ithaca,USA

S. Abdullin,M. Albrow, J. Anderson, G. Apollinari, S. Banerjee, L.A.T. Bauerdick, A. Beretvas, J. Berryhill, P.C. Bhat, G. Bolla,K. Burkett,J.N. Butler, H.W.K. Cheung, F. Chlebana,S. Cihangir, V.D. Elvira, I. Fisk, J. Freeman, E. Gottschalk,L. Gray, D. Green, S. Grünendahl, O. Gutsche, J. Hanlon, D. Hare, R.M. Harris, S. Hasegawa,J. Hirschauer,Z. Hu, S. Jindariani, M. Johnson,U. Joshi, A.W. Jung, B. Klima, B. Kreis, S. Kwan†,S. Lammel, J. Linacre, D. Lincoln,R. Lipton, T. Liu, R. Lopes De Sá,J. Lykken, K. Maeshima, J.M. Marraffino, V.I. Martinez Outschoorn,S. Maruyama, D. Mason, P. McBride,P. Merkel, K. Mishra, S. Mrenna, S. Nahn, C. Newman-Holmes,V. O’Dell, K. Pedro, O. Prokofyev,G. Rakness,

E. Sexton-Kennedy,A. Soha, W.J. Spalding, L. Spiegel, L. Taylor,S. Tkaczyk, N.V. Tran,L. Uplegger, E.W. Vaandering,C. Vernieri, M. Verzocchi, R. Vidal,H.A. Weber,A. Whitbeck, F. Yang

FermiNationalAcceleratorLaboratory,Batavia,USA

D. Acosta, P. Avery, P. Bortignon, D. Bourilkov, A. Carnes, M. Carver, D. Curry,S. Das, G.P. Di Giovanni, R.D. Field, I.K. Furic, J. Hugon, J. Konigsberg,A. Korytov, J.F. Low, P. Ma,K. Matchev, H. Mei,

P. Milenovic62,G. Mitselmakher, D. Rank, R. Rossin, L. Shchutska, M. Snowball, D. Sperka,N. Terentyev, L. Thomas, J. Wang, S. Wang,J. Yelton

UniversityofFlorida,Gainesville,USA

S. Hewamanage, S. Linn, P. Markowitz, G. Martinez, J.L. Rodriguez FloridaInternationalUniversity,Miami,USA

A. Ackert,J.R. Adams, T. Adams, A. Askew,J. Bochenek, B. Diamond,J. Haas, S. Hagopian, V. Hagopian, K.F. Johnson,A. Khatiwada, H. Prosper,M. Weinberg

FloridaStateUniversity,Tallahassee,USA

M.M. Baarmand,V. Bhopatkar, S. Colafranceschi63,M. Hohlmann, H. Kalakhety, D. Noonan, T. Roy, F. Yumiceva

FloridaInstituteofTechnology,Melbourne,USA

M.R. Adams,L. Apanasevich, D. Berry, R.R. Betts, I. Bucinskaite,R. Cavanaugh, O. Evdokimov, L. Gauthier, C.E. Gerber,D.J. Hofman,P. Kurt, C. O’Brien,I.D. Sandoval Gonzalez, C. Silkworth,P. Turner, N. Varelas, Z. Wu,M. Zakaria

B. Bilki64, W. Clarida,K. Dilsiz, S. Durgut, R.P. Gandrajula,M. Haytmyradov, V. Khristenko, J.-P. Merlo, H. Mermerkaya65,A. Mestvirishvili, A. Moeller, J. Nachtman, H. Ogul, Y. Onel, F. Ozok53,A. Penzo, C. Snyder, P. Tan, E. Tiras, J. Wetzel,K. Yi

TheUniversityofIowa,IowaCity,USA

I. Anderson, B.A. Barnett, B. Blumenfeld,N. Eminizer, D. Fehling, L. Feng, A.V. Gritsan, P. Maksimovic, C. Martin,M. Osherson,J. Roskes, A. Sady,U. Sarica, M. Swartz, M. Xiao, Y. Xin, C. You

JohnsHopkinsUniversity,Baltimore,USA

P. Baringer,A. Bean,G. Benelli, C. Bruner,R.P. Kenny III, D. Majumder, M. Malek, M. Murray,S. Sanders, R. Stringer, Q. Wang

TheUniversityofKansas,Lawrence,USA

A. Ivanov, K. Kaadze,S. Khalil, M. Makouski,Y. Maravin, A. Mohammadi, L.K. Saini, N. Skhirtladze, S. Toda

KansasStateUniversity,Manhattan,USA

D. Lange, F. Rebassoo,D. Wright LawrenceLivermoreNationalLaboratory,Livermore,USA

C. Anelli,A. Baden, O. Baron,A. Belloni, B. Calvert,S.C. Eno,C. Ferraioli, J.A. Gomez,N.J. Hadley, S. Jabeen, R.G. Kellogg,T. Kolberg, J. Kunkle, Y. Lu, A.C. Mignerey, Y.H. Shin,A. Skuja, M.B. Tonjes, S.C. Tonwar UniversityofMaryland,CollegePark,USA

A. Apyan,R. Barbieri, A. Baty, K. Bierwagen, S. Brandt, W. Busza, I.A. Cali, Z. Demiragli,L. Di Matteo, G. Gomez Ceballos, M. Goncharov,D. Gulhan, Y. Iiyama, G.M. Innocenti,M. Klute, D. Kovalskyi,Y.S. Lai, Y.-J. Lee,A. Levin, P.D. Luckey, A.C. Marini,C. Mcginn, C. Mironov, X. Niu,C. Paus, D. Ralph, C. Roland, G. Roland,J. Salfeld-Nebgen, G.S.F. Stephans, K. Sumorok, M. Varma, D. Velicanu,J. Veverka, J. Wang, T.W. Wang, B. Wyslouch, M. Yang, V. Zhukova

MassachusettsInstituteofTechnology,Cambridge,USA

B. Dahmes, A. Evans,A. Finkel, A. Gude, P. Hansen, S. Kalafut, S.C. Kao, K. Klapoetke, Y. Kubota,Z. Lesko, J. Mans,S. Nourbakhsh, N. Ruckstuhl,R. Rusack, N. Tambe, J. Turkewitz

UniversityofMinnesota,Minneapolis,USA J.G. Acosta,S. Oliveros UniversityofMississippi,Oxford,USA

E. Avdeeva, K. Bloom, S. Bose,D.R. Claes, A. Dominguez,C. Fangmeier, R. Gonzalez Suarez,

R. Kamalieddin,J. Keller,D. Knowlton, I. Kravchenko, J. Lazo-Flores,F. Meier, J. Monroy, F. Ratnikov, J.E. Siado,G.R. Snow

UniversityofNebraska-Lincoln,Lincoln,USA

M. Alyari,J. Dolen, J. George, A. Godshalk,C. Harrington, I. Iashvili, J. Kaisen, A. Kharchilava,A. Kumar, S. Rappoccio

StateUniversityofNewYorkatBuffalo,Buffalo,USA

G. Alverson, E. Barberis, D. Baumgartel, M. Chasco, A. Hortiangtham,A. Massironi, D.M. Morse, D. Nash, T. Orimoto,R. Teixeira De Lima, D. Trocino, R.-J. Wang, D. Wood,J. Zhang

K.A. Hahn, A. Kubik,N. Mucia, N. Odell, B. Pollack, A. Pozdnyakov,M. Schmitt, S. Stoynev,K. Sung, M. Trovato,M. Velasco

NorthwesternUniversity,Evanston,USA

A. Brinkerhoff,N. Dev, M. Hildreth,C. Jessop, D.J. Karmgard, N. Kellams, K. Lannon, S. Lynch,

N. Marinelli, F. Meng,C. Mueller,Y. Musienko37,T. Pearson,M. Planer, A. Reinsvold,R. Ruchti,G. Smith, S. Taroni, N. Valls,M. Wayne, M. Wolf, A. Woodard

UniversityofNotreDame,NotreDame,USA

L. Antonelli,J. Brinson, B. Bylsma, L.S. Durkin, S. Flowers, A. Hart, C. Hill,R. Hughes, W. Ji, K. Kotov, T.Y. Ling, B. Liu,W. Luo, D. Puigh, M. Rodenburg, B.L. Winer, H.W. Wulsin

TheOhioStateUniversity,Columbus,USA

O. Driga,P. Elmer, J. Hardenbrook, P. Hebda,S.A. Koay, P. Lujan, D. Marlow,T. Medvedeva, M. Mooney, J. Olsen, C. Palmer,P. Piroué, X. Quan, H. Saka,D. Stickland, C. Tully,J.S. Werner, A. Zuranski

PrincetonUniversity,Princeton,USA S. Malik

UniversityofPuertoRico,Mayaguez,USA

V.E. Barnes,D. Benedetti,D. Bortoletto, L. Gutay, M.K. Jha,M. Jones, K. Jung, D.H. Miller, N. Neumeister, B.C. Radburn-Smith, X. Shi, I. Shipsey, D. Silvers, J. Sun,A. Svyatkovskiy, F. Wang, W. Xie, L. Xu

PurdueUniversity,WestLafayette,USA N. Parashar,J. Stupak PurdueUniversityCalumet,Hammond,USA

A. Adair,B. Akgun, Z. Chen, K.M. Ecklund, F.J.M. Geurts,M. Guilbaud, W. Li, B. Michlin, M. Northup, B.P. Padley,R. Redjimi, J. Roberts, J. Rorie, Z. Tu, J. Zabel

RiceUniversity,Houston,USA

B. Betchart,A. Bodek, P. de Barbaro, R. Demina, Y. Eshaq,T. Ferbel, M. Galanti, A. Garcia-Bellido,J. Han, A. Harel, O. Hindrichs, A. Khukhunaishvili, G. Petrillo, M. Verzetti

UniversityofRochester,Rochester,USA

S. Arora,A. Barker, J.P. Chou, C. Contreras-Campana, E. Contreras-Campana,D. Duggan, D. Ferencek, Y. Gershtein,R. Gray, E. Halkiadakis, D. Hidas,E. Hughes, S. Kaplan, R. Kunnawalkam Elayavalli, A. Lath, K. Nash,S. Panwalkar, M. Park, S. Salur,S. Schnetzer, D. Sheffield, S. Somalwar, R. Stone,S. Thomas, P. Thomassen,M. Walker

Rutgers,TheStateUniversityofNewJersey,Piscataway,USA

M. Foerster, G. Riley, K. Rose, S. Spanier,A. York UniversityofTennessee,Knoxville,USA

O. Bouhali66, A. Castaneda Hernandez66,M. Dalchenko, M. De Mattia, A. Delgado, S. Dildick,R. Eusebi, W. Flanagan,J. Gilmore, T. Kamon67,V. Krutelyov, R. Mueller, I. Osipenkov,Y. Pakhotin, R. Patel,

A. Perloff,A. Rose, A. Safonov,A. Tatarinov, K.A. Ulmer2 TexasA&MUniversity,CollegeStation,USA

N. Akchurin, C. Cowden,J. Damgov, C. Dragoiu, P.R. Dudero, J. Faulkner, S. Kunori,K. Lamichhane, S.W. Lee, T. Libeiro, S. Undleeb, I. Volobouev