Search for New Physics in the Multijet and Missing Transverse Momentum Final State
in Proton-Proton Collisions at
p
ffiffiffi
s
¼ 7 TeV
S. Chatrchyan et al.* (CMS Collaboration)
(Received 8 July 2012; published 26 October 2012)
A search for physics beyond the standard model is performed in events with at least three jets and large missing transverse momentum produced in proton-proton collisions at a center-of-mass energy offfiffiffi
s p
¼ 7 TeV. No significant excess of events above the expected backgrounds is observed in 4:98 fb1
of data collected with the CMS detector at the Large Hadron Collider. The results are presented in the context of the constrained minimal supersymmetric extension of the standard model and more generically for simplified models. For the simplified models of gluino-gluino and squark-squark production, gluino masses below 1.0 TeV and squark masses below 0.76 TeV are excluded in case the lightest supersymmetric particle mass is below 200 GeV. These results significantly extend previous searches.
DOI:10.1103/PhysRevLett.109.171803 PACS numbers: 14.80.Ly, 12.60.Jv, 13.85.Rm
Many extensions of the standard model (SM) of particle physics have been proposed to address the shortcomings of the SM, e.g., problems concerning the gauge hierarchy and identity of dark matter [1–3]. Supersymmetry (SUSY) is one such new physics model, which postulates a new symmetry that relates fermionic and bosonic degrees of freedom and introduces a super-partner for each SM particle. In R-parity conserving models [4], SUSY particles are produced in pairs, and the lightest SUSY particle (LSP) is stable. If the LSP is weakly interacting and neutral, it serves as a candidate for dark matter. At the Large Hadron Collider (LHC), squarks (q) and gluinos (~g), the superpartners of the~ quarks and gluons, would be produced via the strong interaction and decay to SM particles and two LSPs. A typical signature is the all-hadronic final state, charac-terized by multiple jets arising from quarks and gluons, and large missing transverse momentum due to the un-observed LSPs.
Searches in this final state have been performed by experiments at the Fermilab Tevatron [5,6] and at the LHC [7–15]. This Letter presents a search in events with multiple jets and large missing transverse momentum pro-duced in 7 TeV pp collisions using a data sample corre-sponding to an integrated luminosity of 4:98 0:11 fb1 [16] collected with the Compact Muon Solenoid (CMS) detector. The search strategy follows Ref. [7] but uses more than 100 times the amount of data. This search is not specifically optimized for a particular SUSY model but is sensitive to a variety of new physics models that lead to
the multijet final state with large missing transverse mo-mentum. The results of this search are interpreted in the context of the constrained minimal supersymmetric extension of the SM (CMSSM) [17–19] and in a more general context for simplified models [20,21] of new particles decaying to one or two jets and a stable weakly interacting particle.
The central feature of the CMS detector [22] is a super-conducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. Within the field volume are the silicon pixel and strip tracker, the lead-tungstate crystal electromagnetic calorimeter, and the brass and scintillator hadron calorimeter. Charged particles are measured by the silicon tracker, covering 0 < < 2 in azimuth and jj < 2:5 [23]. The calorimeters surrounding the tracking volume cover jj < 3. Outside the field, the quartz and steel forward hadron calorimeters extend the coverage to jj < 5. Muons are identified in gas ionization detectors, covering jj < 2:4, embedded in the steel return yoke of the magnet. A two-tier trigger system selects the pp col-lision events for use in this search.
The recorded events are reconstructed using the particle-flow algorithm [24], which reconstructs partic-les, namely, charged hadrons, photons, neutral hadrons, muons, and electrons, using the information from all subdetectors. These particles are then clustered into jets using the anti-kT clustering algorithm with distance pa-rameter 0.5 [25]. Corrections are applied to account for the dependence of the jet response on transverse mom-entum pT and [26] and for the effects of additional (pileup) pp collisions overlapping with the collision of interest [27,28].
The event sample for the search is selected by requiring at least three jets with pT> 50 and jj < 2:5. The further selection is based on two variables: HT, defined as HT¼ Pp
T where the sum is carried out over jets with pT>
50 GeV and jj < 2:5, and =~HT, defined as =~HT¼
P ~p
T
*Full author list given at the end of the article.
Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distri-bution of this work must maintain attridistri-bution to the author(s) and the published article’s title, journal citation, and DOI.
where the sum is over jets with pT> 30 GeV and jj < 5. Events are required to have HT> 500 GeV and =HT> 200 GeV, where =HT is the magnitude of the =~HT. The
=
HT requirement rejects most of the QCD multijet back-ground. Events with =~HTaligned in azimuth with one of the two leading jets with < 0:5 rad or along the third jet with < 0:3 rad are removed to further reduce the QCD multijet background. Events containing isolated muons or electrons with pT> 10 GeV are also vetoed in order to reject tt and W=Zþ jets backgrounds with leptons in the final state [7,29,30]. Events are also rejected if a jet with pT> 30 GeV has an electromagnetic pT fraction larger
than 0.95 or a neutral hadron pTfraction larger than 0.90. In addition, events affected by instrumental effects, particles from noncollision sources, and poor reconstruction quality are rejected (event cleaning) [7,31]. All these requirements constitute the baseline selection [32]. The event sample used in this search is collected by triggering on both HT and =HTor only on HT. The HTthreshold ranges from 160 to 350 GeV, and the =HT threshold ranges from 60 to 110 GeV. The trigger efficiency is measured to be consis-tent with 100% for the baseline event selection.
To increase the sensitivity of the search to the different kinematic regions of signal events, the sample of 1885 events passing the baseline selection is divided into 14 subsamples defined in terms of the HT and =HT values (search selections), as listed in the first column of TableI. The SM backgrounds mainly consist of Zð Þ þ jets events and Wð‘Þ þ jets events from W or tt production (‘¼ e, , or ). The Wð‘Þ þ jets events pass the search selection when the e= escapes detection or a decays hadronically. The QCD multijet events also contribute to the background when leptonic decays of heavy-flavor had-rons inside jets or jet energy mismeasurements lead to a
large =HT. The contributions from other SM processes are found to be negligible. In this search, all of the back-grounds are estimated from data [7].
Several Monte Carlo (MC) samples are used to model the signal as well as to develop and validate the background prediction methods. The tt, W=Zþ jets, and þ jets samples are produced using theMADGRAPH5[33] generator, interfaced with the PYTHIA 6.4.24 [34] parton-shower model. The tt and W=Zþ jets samples are scaled up to the next-to-leading-order (NLO) or next-to-next-to-leading-order cross section predictions [35,36]. The QCD multijet and SUSY signal production is simulated with PYTHIA6.4.24, the CTEQ6L [37] parton distribution func-tions (PDFs), and a CMS custom underlying event tuning [38]. The generated events are passed through aGEANT4 -based [39] detector simulation and have the same distribu-tion of pileup pp interacdistribu-tions as observed in the data.
The Zð Þ þ jets background contribution is estimated using þ jets events by treating photons as Z ! de-cays. The Z boson and photon exhibit similar kinematic properties at high pT, and the hadronic component of events is similar in the two cases [40–43]. A þ jets sample is collected by triggering on a candidate with or without an additional requirement on HT, depending on the data-taking period. The photon candidates [44] are required to be iso-lated from other particles in the tracker and calorimeters and to have the shower shape consistent with that for a prompt photon. In order to predict the Zð Þ þ jets background, the þ jets sample is corrected for the reconstruction efficiency and purity, both measured from data [7], and the Zð Þ þ jets= þ jets production ratio, obtained from the MADGRAPHsimulation samples, which also takes into account the detector acceptance for photons. The total multiplicative correction factor to obtain the Zð Þ þ jets
TABLE I. Event yields for different backgrounds for the 14 search selections together with the total backgrounds, as determined from the collision data, and number of events observed in data. The quoted uncertainties are the combinations of the statistical and systematic uncertainties.
Selection HT(GeV) H=T (GeV) Z ! tt=W ! e, þ X tt=W ! hþ X QCD multijet Total background Data
500–800 200–350 359 81 327 47 349 40 119 77 1154 128 1269 500–800 350–500 112 26 48 9 62:5 8:7 2:2 2:2 225 29 236 500–800 500–600 17:6 4:9 5:0 2:2 8:7 2:5 0:0 0:1 31:3 5:9 22 500–800 >600 5:5 2:6 0:8 0:8 2:0 1:8 0:0 0:0 8:3 3:2 6 800–1000 200–350 48 19 58 15 56:3 8:3 35 24 197 35 177 800–1000 350–500 16:0 6:7 5:4 2:3 7:2 2:0 1:2þ1:31:2 29:8 7:5 24 800–1000 500–600 7:1 3:7 2:4 1:5 1:3 0:6 0:0þ0:20:0 10:8 4:0 6 800–1000 >600 3:3 1:7 0:7 0:7 1:0 0:3 0:0þ0:10:0 5:0 1:9 5 1000–1200 200–350 10:9 5:1 13:7 3:8 21:9 4:6 19:7 13:3 66 15 71 1000–1200 350–500 5:5 3:0 5:0 4:4 2:9 1:3 0:4þ0:70:4 13:8 5:5 12 1000–1200 >500 2:2 1:7 1:6 1:2 2:3 1:0 0:0þ0:20:0 6:1 2:3 4 1200–1400 200–350 3:1 1:8 4:2 2:1 6:2 1:8 11:7 8:3 25:2 8:9 29 1200–1400 >350 2:3 1:5 2:3 1:4 0:6þ0:80:6 0:2þ0:60:2 5:4 2:3 8 >1400 >200 3:2 1:8 2:7 1:6 1:1 0:5 12:0 9:1 19:0 9:4 16
background prediction from the þ jets event yield is 0:28 0:06 for the baseline selection. The dominant systematic uncertainties on this background estimation originate from the theoretical uncertainty on the =Z cross section ratio (20–40%) [40,43], the detector acceptance (5–7%), and the reconstruction and isolation efficiency (1–10%), depending on the search regions.
As a cross check, the Zð Þ þ jets background is also estimated using ZðþÞ þ jets events by treating muons as neutrinos and correcting for the acceptance and effici-encies of the ZðþÞ þ jets event selection and the ratio of branching fractions Bð! Þ=Bð! þÞ ¼ 5:95 0:02 [45]. The Zð Þ þ jets background estimated with this method is found to be consistent with the one from the þ jets events.
The Wð‘Þ þ jets events (‘ ¼ e or ) from W or top quark production constitute a background when an electron or muon is not identified or is nonisolated and therefore passes the lepton veto. This background is estimated from a þ jets control sample, selected with the same criteria as those used for the search, except that we require exactly one rather than zero isolated . The transverse mass mT¼
ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi 2pT6ET½1 cosðÞ
q
is required to be less than 100 GeV in order to select events containing a W! decay and to suppress possible new physics signal contamination, i.e., the signal events resulting in the þ jets sample used for the background estimation. Here,6ETis the missing trans-verse energy [31], and is the azimuthal angle between the and the6ET. Events are weighted according toð1=isoÞ [ð1 e;recoÞ=reco] andðrecoe;=recoÞ [ð1 e;isoÞ=iso] in or-der to predict events with unidentified leptons and non-isolated leptons, where e;recoand e;iso are the reconstruction and isolation efficiencies of the electrons and muons. The lepton reconstruction efficiencies are obtained from MC simulation, while the isolation efficiencies are extracted by applying a ‘‘tag-and-probe’’ method [46] on the Zð‘þ‘Þ þ jets events in data. The lepton reconstruction
and identification efficiencies are parametrized in lepton pTand R ¼pffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiðÞ2þ ðÞ2 relative to the closest jet,
in order to account for the kinematic differences between Zð‘þ‘Þ þ jets events and the tt and W þ jets events.
Leptons that are out of acceptance and events lost due to the mT requirement are accounted for using factors determined from simulation. This background estimation method based on the collision data is validated by applying it to a MC sample and comparing the predicted and the true detector-level background distributions.
The predicted background for each search region is listed in TableI. On this background estimation, low statistics in the þ jets control sample are the dominant source of uncertainty in most of the search regions. The modeling of the lepton reconstruction and isolation efficiencies yields a 10% uncertainty. An additional uncertainty of 4–20% varying for different search regions is assigned based on
the statistical power of the validation of this background estimation method. A 3% uncertainty accounts for the effect of the presence of QCD, Z, or diboson events in the þ jets sample, which are modeled by MC simulation.
The background from the hadronic decay of leptons (h) is estimated from a sample of þ jets events, selected from inclusive or þ 2-jet triggers by requiring exactly one with pT> 20 GeV and jj < 2:1. In this sample, the muon pT is replaced with a jet pT taken randomly from a simulated response function for a ha-dronically decaying lepton. The HTand =HTof the event are recalculated including this jet, and the search selec-tions are applied to predict the h background. The -jet response function for pjetT=pT is obtained from simulated tt and WðÞ þ jets events by matching the reconstructed jet with the generated . Corrections are applied to account for the trigger efficiency, acceptance, and effi-ciency of the selection, and the ratio of branching fractions BðW ! hÞ=BðW ! Þ ¼ 0:69 0:05 [45]. This h background estimation method is validated by applying it to the W and tt MC samples, and 6–13% uncertainties are assigned mainly to reflect the statistical power of this validation. The other main systematic un-certainties arise from the acceptance ( 13%); the -jet response function ( 20%); and the subtraction of residual QCD multijet, ZðþÞ þ jets, and ðtt=WÞ ! þ X ! þ X backgrounds ( 2%), where the quoted uncer-tainties apply to all search regions.
The QCD background is estimated from collision data [7] recorded with a set of triggers having an HTthreshold ranging from 150 to 700 GeV. The data samples used include the electroweak contributions not removed by the lepton veto and any potential new physics events; however, their cross section is negligible compared to the QCD multijet cross section. First, the pTvalues of the jets with pT> 15 GeV in these events are adjusted within the jet pT
resolution, using a kinematic fit such that the events are balanced in the transverse plane. The jet pT values in the rebalanced events are then smeared with the measured jet resolutions to predict the QCD multijet background. The jet pT response functions are determined as a function of pT and using a QCD multijet MC sample that includes heavy-flavor quarks. The width and tail of the pTresponse functions are subsequently adjusted to account for the differences in the resolutions measured in simulation and in data [26]. The width ( ) of the Gaussian part of the simulated response is 5 ð30Þ% narrower than what is observed in the data for jj < 0:5 (2:3 < jj < 5:0). After correcting for this difference, the fraction of jets with response more than 2:5 away from the mean value is consistent with that in the data within uncertainties. The main uncertainties in this QCD estimation method arise from the shape of the jet response functions, including the Gaussian width, the tails, the heavy-flavor contribution, and the effect of pileup on jets in an event. The method
has been validated in simulated QCD multijet events within the statistical uncertainties (30–50%), which are assigned as an additional uncertainty. The total uncertainty adds up to 60–70%.
The predicted yields of the SM background and the number of events observed in data are summarized in TableIfor the 14 search regions. Figure 1shows the HT and =HT distributions predicted for the SM background, together with those observed in data. The data are consis-tent with the SM background estimates.
The 95% confidence level (C.L.) upper limits on the CMSSM signal cross section are set using a modified frequentist CLs method, taking the profile likelihood as a
test statistic [47–49]. The results from 14 exclusive search regions are combined into one test statistic considering the bin-to-bin correlations of the systematic uncertainties. The CMSSM model has five independent parameters: the uni-versal scalar and gaugino masses at the grand unification scale, m0 and m1=2; the trilinear coupling, A0; the ratio of the vacuum expectation values of the two Higgs doublets, tan; and the sign of the Higgsino mixing parameter, . The signal cross section is calculated at NLO and next-to-leading-log (NLL) accuracy [50–52]. The HT and =HT distributions predicted for a low-mass CMSSM benchmark parameter set LM5, m0 ¼ 230 GeV, m1=2 ¼ 360 GeV, A0¼ 0, tan ¼ 10, and > 0, are shown in Fig.1.
The acceptance times efficiency of the event selection for signal events is evaluated using the simulated CMSSM samples. The uncertainties on the background predictions, the luminosity determination (2:2%) [16], the signal accep-tance and efficiency arising from the jet energy correction (8%), the jet energy resolution (2%), the PDF (6%), the trigger inefficiency (2%), and the event cleaning [31] (3%) are taken into account by the limit-setting procedure. The possible overprediction of the backgrounds due to the presence of the signal in the data samples used for the
background prediction is estimated to be about 3–20%, depending onðm0; m1=2Þ values, and subtracted when testing for the signalþ background hypothesis in the CLsmethod.
The upper limits on the CMSSM signal cross section are mapped into lower limits in theðm0; m1=2Þ plane (exclusion contour), as shown in Fig. 2[32,53]. The exclusion con-tours are also shown for the cases in which the signal cross section is varied by changing the renormalization and factorization scales by a factor of 2 and using the PDF4LHC recommendation [54] for the PDF uncertainty to illustrate the sensitivity of the exclusion to the signal cross section uncertainty. Conservatively, using the 1 theory uncertainty values on the observed limit, squark masses below 1.2 TeV and gluino masses below 0.72 TeV are excluded for the chosen CMSSM parameter set.
The search results are also presented in a more general context of simplified models [20,21] of new particles (q or~
~
g) decaying to one or two jets and an undetectable weakly interacting particle ( ~0). The model used here includes the
production ofg~g and ~q~q pairs and their decays for a wide~ range ofðmð~gÞ; mð~ 0ÞÞ and ðmð~qÞ; mð~ 0ÞÞ values, and other
SUSY particles are decoupled by being given masses beyond the reach of the LHC. The signal acceptance times efficiency [32] and its uncertainty are evaluated in the same way as used for the CMSSM but using the simulated simplified model signal samples. The observed and ex-pected 95% C.L. upper limits on the signal cross section of g~g and ~q~q production are shown in Fig.~ 3 in the
Events 1 10 2 10 3 10 4 10 (a) CMS, 4.98 fb-1, s = 7 TeV [GeV] T H 500 1000 1500 2000 Data / Pred. 1 2 (b) Data LM5 +jets ν ν → Z +X h τ → t W/t +X µ e/ → t W/t QCD [GeV] T H 200 400 600 800
FIG. 1 (color online). The (a) HT and (b) =HT distributions in
the search data samples (circles) compared with histograms showing predictions of the SM background and SUSY signal (LM5, see the text) for events passing the baseline selection. The hatched region indicates the uncertainties on the background predictions. The last bin contains all events above the maximum values of HT and =HT in the figures. The ratio of the observed data to the background predictions is also shown.
[GeV] 0 m 500 1000 1500 2000 2500 3000 [GeV] 1/2 m 100 200 300 400 500 600 700 800 900 1000 ± l ~ LEP2 ± 1 χ∼ LEP2 No EW SB = LSPτ∼ Nonconvergent RGE's ) = 500 g~ m( ) = 1000 g~ m( ) = 1500 g~ m( ) = 2000 g~ m( ) = 1000 q~ m( ) = 1 500 q~ m( ) = 2000 q~ m( ) = 2 500 q~ m( )=10 β tan( = 0 GeV 0 A > 0 µ = 173.2 GeV t m -1, s = 7 TeV L dt = 4.98 fb
∫
CMS, Observed signal theory σ 1 ± Observed exp. σ 1 ± Expected -1 CMS, 36 pb LM5FIG. 2 (color online). The observed and expected 95% C.L. limits in the CMSSM ðm0; m1=2Þ plane. The shaded region around the expected limit shows the 1 variation in the expected limit, while the dot-dashed curves show the variation in the observed limit when the signal cross section is varied by its theoretical uncertainties. The remaining CMSSM parameters are tan ¼ 10, > 0, and A0¼ 0. The limits from an earlier
CMS search [7] and from other experiments [55] are also shown. The limits from Ref. [7] are shown only up to 1000 GeV in m0, as done in [7]. The regions where the superpartner of the lepton (~) is the LSP, the renormalization group equations (RGEs) do not converge, or there is no electroweak symmetry breaking (EWSB) [53], are also indicated.
ðmð~gÞ; mð~ 0ÞÞ and ðmð~qÞ; mð~ 0ÞÞ planes, together with
contours where the signal cross sections from the NLO þ NLL calculations [50–52] are excluded. The re-sults are presented only in the region of mð~g; ~qÞ mð~ 0Þ >
150 GeV, since the estimation of signal acceptance times efficiency becomes unreliable due to its strong dependence on the modeling of QCD radiation when the mass differ-ence mð~g; ~qÞ mð~ 0Þ is smaller. In this model, the mð~gÞ
values below 1.0 TeV and mð~qÞ values below 0.76 TeV are excluded for mð~ 0Þ < 200 GeV.
In summary, a search for new physics has been performed in the final state with at least three jets and large =HTusing a data sample corresponding to an integrated luminosity of 4:98 fb1 collected in 7 TeV pp collisions with the CMS detector at the LHC. The observed numbers of events are consistent with the estimated SM background contributions, and 95% C.L. exclusion limits are set in the CMSSM parameter space which significantly extend the previous results. For the simplified models ofg~g and ~q~q production,~ the mð~gÞ values below 1.0 TeV and mð~qÞ values below 0.76 TeV are excluded for mð~ 0Þ < 200 GeV.
We wish to congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC machine. We thank the technical and adminis-trative staff at CERN and other CMS institutes and acknowledge support from FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia); Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Korea); LAS (Lithuania);
CINVESTAV, CONACYT, SEP, and UASLP-FAI
(Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTD (Serbia);
MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); and DOE and NSF (USA).
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A. Juodagalvis,74H. Castilla-Valdez,75E. De La Cruz-Burelo,75I. Heredia-de La Cruz,75R. Lopez-Fernandez,75 R. Magan˜a Villalba,75J. Martı´nez-Ortega,75A. Sa´nchez-Herna´ndez,75L. M. Villasenor-Cendejas,75 S. Carrillo Moreno,76F. Vazquez Valencia,76H. A. Salazar Ibarguen,77E. Casimiro Linares,78A. Morelos Pineda,78
M. A. Reyes-Santos,78D. Krofcheck,79A. J. Bell,80P. H. Butler,80R. Doesburg,80S. Reucroft,80H. Silverwood,80 M. Ahmad,81M. I. Asghar,81H. R. Hoorani,81S. Khalid,81W. A. Khan,81T. Khurshid,81S. Qazi,81M. A. Shah,81 M. Shoaib,81G. Brona,82K. Bunkowski,82M. Cwiok,82W. Dominik,82K. Doroba,82A. Kalinowski,82M. Konecki,82
J. Krolikowski,82H. Bialkowska,83B. Boimska,83T. Frueboes,83R. Gokieli,83M. Go´rski,83M. Kazana,83 K. Nawrocki,83K. Romanowska-Rybinska,83M. Szleper,83G. Wrochna,83P. Zalewski,83N. Almeida,84 P. Bargassa,84A. David,84P. Faccioli,84M. Fernandes,84P. G. Ferreira Parracho,84M. Gallinaro,84J. Seixas,84
J. Varela,84P. Vischia,84P. Bunin,85M. Gavrilenko,85I. Golutvin,85I. Gorbunov,85V. Karjavin,85 V. Konoplyanikov,85G. Kozlov,85A. Lanev,85A. Malakhov,85P. Moisenz,85V. Palichik,85V. Perelygin,85 M. Savina,85S. Shmatov,85V. Smirnov,85A. Volodko,85A. Zarubin,85S. Evstyukhin,86V. Golovtsov,86Y. Ivanov,86
V. Kim,86P. Levchenko,86V. Murzin,86V. Oreshkin,86I. Smirnov,86V. Sulimov,86L. Uvarov,86S. Vavilov,86 A. Vorobyev,86An. Vorobyev,86Yu. Andreev,87A. Dermenev,87S. Gninenko,87N. Golubev,87M. Kirsanov,87
N. Krasnikov,87V. Matveev,87A. Pashenkov,87D. Tlisov,87A. Toropin,87V. Epshteyn,88M. Erofeeva,88 V. Gavrilov,88M. Kossov,88,fN. Lychkovskaya,88V. Popov,88G. Safronov,88S. Semenov,88V. Stolin,88E. Vlasov,88
A. Zhokin,88A. Belyaev,89E. Boos,89M. Dubinin,89,eL. Dudko,89A. Ershov,89A. Gribushin,89V. Klyukhin,89 O. Kodolova,89I. Lokhtin,89A. Markina,89S. Obraztsov,89M. Perfilov,89S. Petrushanko,89A. Popov,89 L. Sarycheva,89,aV. Savrin,89A. Snigirev,89V. Andreev,90M. Azarkin,90I. Dremin,90M. Kirakosyan,90 A. Leonidov,90G. Mesyats,90S. V. Rusakov,90A. Vinogradov,90I. Azhgirey,91I. Bayshev,91S. Bitioukov,91 V. Grishin,91,fV. Kachanov,91D. Konstantinov,91A. Korablev,91V. Krychkine,91V. Petrov,91R. Ryutin,91A. Sobol,91
L. Tourtchanovitch,91S. Troshin,91N. Tyurin,91A. Uzunian,91A. Volkov,91P. Adzic,92,ddM. Djordjevic,92 M. Ekmedzic,92D. Krpic,92,ddJ. Milosevic,92M. Aguilar-Benitez,93J. Alcaraz Maestre,93P. Arce,93C. Battilana,93
E. Calvo,93M. Cerrada,93M. Chamizo Llatas,93N. Colino,93B. De La Cruz,93A. Delgado Peris,93 D. Domı´nguez Va´zquez,93C. Fernandez Bedoya,93J. P. Ferna´ndez Ramos,93A. Ferrando,93J. Flix,93M. C. Fouz,93
P. Garcia-Abia,93O. Gonzalez Lopez,93S. Goy Lopez,93J. M. Hernandez,93M. I. Josa,93G. Merino,93 J. Puerta Pelayo,93A. Quintario Olmeda,93I. Redondo,93L. Romero,93J. Santaolalla,93M. S. Soares,93 C. Willmott,93C. Albajar,94G. Codispoti,94J. F. de Troco´niz,94H. Brun,95J. Cuevas,95J. Fernandez Menendez,95
S. Folgueras,95I. Gonzalez Caballero,95L. Lloret Iglesias,95J. Piedra Gomez,95,eeJ. A. Brochero Cifuentes,96 I. J. Cabrillo,96A. Calderon,96S. H. Chuang,96J. Duarte Campderros,96M. Felcini,96,ffM. Fernandez,96G. Gomez,96 J. Gonzalez Sanchez,96C. Jorda,96A. Lopez Virto,96J. Marco,96R. Marco,96C. Martinez Rivero,96F. Matorras,96
F. J. Munoz Sanchez,96T. Rodrigo,96A. Y. Rodrı´guez-Marrero,96A. Ruiz-Jimeno,96L. Scodellaro,96 M. Sobron Sanudo,96I. Vila,96R. Vilar Cortabitarte,96D. Abbaneo,97E. Auffray,97G. Auzinger,97P. Baillon,97 A. H. Ball,97D. Barney,97J. F. Benitez,97C. Bernet,97,gG. Bianchi,97P. Bloch,97A. Bocci,97A. Bonato,97C. Botta,97
H. Breuker,97T. Camporesi,97G. Cerminara,97T. Christiansen,97J. A. Coarasa Perez,97D. D’Enterria,97 A. Dabrowski,97A. De Roeck,97S. Di Guida,97M. Dobson,97N. Dupont-Sagorin,97A. Elliott-Peisert,97B. Frisch,97
W. Funk,97G. Georgiou,97M. Giffels,97D. Gigi,97K. Gill,97D. Giordano,97M. Giunta,97F. Glege,97 R. Gomez-Reino Garrido,97P. Govoni,97S. Gowdy,97R. Guida,97M. Hansen,97P. Harris,97C. Hartl,97J. Harvey,97
B. Hegner,97A. Hinzmann,97V. Innocente,97P. Janot,97K. Kaadze,97E. Karavakis,97K. Kousouris,97P. Lecoq,97 Y.-J. Lee,97P. Lenzi,97C. Lourenc¸o,97T. Ma¨ki,97M. Malberti,97L. Malgeri,97M. Mannelli,97L. Masetti,97 F. Meijers,97S. Mersi,97E. Meschi,97R. Moser,97M. U. Mozer,97M. Mulders,97P. Musella,97E. Nesvold,97 T. Orimoto,97L. Orsini,97E. Palencia Cortezon,97E. Perez,97L. Perrozzi,97A. Petrilli,97A. Pfeiffer,97M. Pierini,97
M. Pimia¨,97D. Piparo,97G. Polese,97L. Quertenmont,97A. Racz,97W. Reece,97J. Rodrigues Antunes,97 G. Rolandi,97,ggT. Rommerskirchen,97C. Rovelli,97,hhM. Rovere,97H. Sakulin,97F. Santanastasio,97C. Scha¨fer,97 C. Schwick,97I. Segoni,97S. Sekmen,97A. Sharma,97P. Siegrist,97P. Silva,97M. Simon,97P. Sphicas,97,iiD. Spiga,97
M. Spiropulu,97,eA. Tsirou,97G. I. Veres,97,sJ. R. Vlimant,97H. K. Wo¨hri,97S. D. Worm,97,jjW. D. Zeuner,97 W. Bertl,98K. Deiters,98W. Erdmann,98K. Gabathuler,98R. Horisberger,98Q. Ingram,98H. C. Kaestli,98S. Ko¨nig,98
D. Kotlinski,98U. Langenegger,98F. Meier,98D. Renker,98T. Rohe,98J. Sibille,98,kkL. Ba¨ni,99P. Bortignon,99 M. A. Buchmann,99B. Casal,99N. Chanon,99A. Deisher,99G. Dissertori,99M. Dittmar,99M. Du¨nser,99J. Eugster,99
K. Freudenreich,99C. Grab,99D. Hits,99P. Lecomte,99W. Lustermann,99A. C. Marini,99
P. Martinez Ruiz del Arbol,99N. Mohr,99F. Moortgat,99C. Na¨geli,99,llP. Nef,99F. Nessi-Tedaldi,99F. Pandolfi,99
L. Pape,99F. Pauss,99M. Peruzzi,99F. J. Ronga,99M. Rossini,99L. Sala,99A. K. Sanchez,99A. Starodumov,99,mm B. Stieger,99M. Takahashi,99L. Tauscher,99,aA. Thea,99K. Theofilatos,99D. Treille,99C. Urscheler,99R. Wallny,99
H. A. Weber,99L. Wehrli,99E. Aguilo,100C. Amsler,100V. Chiochia,100S. De Visscher,100C. Favaro,100 M. Ivova Rikova,100B. Millan Mejias,100P. Otiougova,100P. Robmann,100H. Snoek,100S. Tupputi,100M. Verzetti,100
Y. H. Chang,101K. H. Chen,101C. M. Kuo,101S. W. Li,101W. Lin,101Z. K. Liu,101Y. J. Lu,101D. Mekterovic,101 A. P. Singh,101R. Volpe,101S. S. Yu,101P. Bartalini,102P. Chang,102Y. H. Chang,102Y. W. Chang,102Y. Chao,102 K. F. Chen,102C. Dietz,102U. Grundler,102W.-S. Hou,102Y. Hsiung,102K. Y. Kao,102Y. J. Lei,102R.-S. Lu,102 D. Majumder,102E. Petrakou,102X. Shi,102J. G. Shiu,102Y. M. Tzeng,102X. Wan,102M. Wang,102A. Adiguzel,103
M. N. Bakirci,103,nnS. Cerci,103,ooC. Dozen,103I. Dumanoglu,103E. Eskut,103S. Girgis,103G. Gokbulut,103 E. Gurpinar,103I. Hos,103E. E. Kangal,103G. Karapinar,103,ppA. Kayis Topaksu,103G. Onengut,103K. Ozdemir,103
S. Ozturk,103,qqA. Polatoz,103K. Sogut,103,rrD. Sunar Cerci,103,ooB. Tali,103,ooH. Topakli,103,nnL. N. Vergili,103 M. Vergili,103I. V. Akin,104T. Aliev,104B. Bilin,104S. Bilmis,104M. Deniz,104H. Gamsizkan,104A. M. Guler,104 K. Ocalan,104A. Ozpineci,104M. Serin,104R. Sever,104U. E. Surat,104M. Yalvac,104E. Yildirim,104M. Zeyrek,104 E. Gu¨lmez,105B. Isildak,105,ssM. Kaya,105,ttO. Kaya,105,ttS. Ozkorucuklu,105,uuN. Sonmez,105,vvK. Cankocak,106
L. Levchuk,107F. Bostock,108J. J. Brooke,108E. Clement,108D. Cussans,108H. Flacher,108R. Frazier,108 J. Goldstein,108M. Grimes,108G. P. Heath,108H. F. Heath,108L. Kreczko,108S. Metson,108D. M. Newbold,108,jj
K. Nirunpong,108A. Poll,108S. Senkin,108V. J. Smith,108T. Williams,108L. Basso,109,wwK. W. Bell,109 A. Belyaev,109,wwC. Brew,109R. M. Brown,109D. J. A. Cockerill,109J. A. Coughlan,109K. Harder,109S. Harper,109
J. Jackson,109B. W. Kennedy,109E. Olaiya,109D. Petyt,109B. C. Radburn-Smith,109
C. H. Shepherd-Themistocleous,109I. R. Tomalin,109W. J. Womersley,109R. Bainbridge,110G. Ball,110 R. Beuselinck,110O. Buchmuller,110D. Colling,110N. Cripps,110M. Cutajar,110P. Dauncey,110G. Davies,110 M. Della Negra,110W. Ferguson,110J. Fulcher,110D. Futyan,110A. Gilbert,110A. Guneratne Bryer,110G. Hall,110
Z. Hatherell,110J. Hays,110G. Iles,110M. Jarvis,110G. Karapostoli,110L. Lyons,110A.-M. Magnan,110 J. Marrouche,110B. Mathias,110R. Nandi,110J. Nash,110A. Nikitenko,110,mmA. Papageorgiou,110J. Pela,110,f M. Pesaresi,110K. Petridis,110M. Pioppi,110,xxD. M. Raymond,110S. Rogerson,110A. Rose,110M. J. Ryan,110
C. Seez,110P. Sharp,110,aA. Sparrow,110M. Stoye,110A. Tapper,110M. Vazquez Acosta,110T. Virdee,110 S. Wakefield,110N. Wardle,110T. Whyntie,110M. Chadwick,111J. E. Cole,111P. R. Hobson,111A. Khan,111 P. Kyberd,111D. Leggat,111D. Leslie,111W. Martin,111I. D. Reid,111P. Symonds,111L. Teodorescu,111M. Turner,111
K. Hatakeyama,112H. Liu,112T. Scarborough,112O. Charaf,113C. Henderson,113P. Rumerio,113A. Avetisyan,114 T. Bose,114C. Fantasia,114A. Heister,114J. St. John,114P. Lawson,114D. Lazic,114J. Rohlf,114D. Sperka,114
L. Sulak,114J. Alimena,115S. Bhattacharya,115D. Cutts,115A. Ferapontov,115U. Heintz,115S. Jabeen,115 G. Kukartsev,115E. Laird,115G. Landsberg,115M. Luk,115M. Narain,115D. Nguyen,115M. Segala,115 T. Sinthuprasith,115T. Speer,115K. V. Tsang,115R. Breedon,116G. Breto,116M. Calderon De La Barca Sanchez,116 S. Chauhan,116M. Chertok,116J. Conway,116R. Conway,116P. T. Cox,116J. Dolen,116R. Erbacher,116M. Gardner,116 R. Houtz,116W. Ko,116A. Kopecky,116R. Lander,116T. Miceli,116D. Pellett,116B. Rutherford,116M. Searle,116
J. Smith,116M. Squires,116M. Tripathi,116R. Vasquez Sierra,116V. Andreev,117D. Cline,117R. Cousins,117 J. Duris,117S. Erhan,117P. Everaerts,117C. Farrell,117J. Hauser,117M. Ignatenko,117C. Jarvis,117C. Plager,117 G. Rakness,117P. Schlein,117,aJ. Tucker,117V. Valuev,117M. Weber,117J. Babb,118R. Clare,118M. E. Dinardo,118 J. Ellison,118J. W. Gary,118F. Giordano,118G. Hanson,118G. Y. Jeng,118,yyH. Liu,118O. R. Long,118A. Luthra,118 H. Nguyen,118S. Paramesvaran,118J. Sturdy,118S. Sumowidagdo,118R. Wilken,118S. Wimpenny,118W. Andrews,119
J. G. Branson,119G. B. Cerati,119S. Cittolin,119D. Evans,119F. Golf,119A. Holzner,119R. Kelley,119 M. Lebourgeois,119J. Letts,119I. Macneill,119B. Mangano,119S. Padhi,119C. Palmer,119G. Petrucciani,119
M. Pieri,119M. Sani,119V. Sharma,119S. Simon,119E. Sudano,119M. Tadel,119Y. Tu,119A. Vartak,119 S. Wasserbaech,119,zzF. Wu¨rthwein,119A. Yagil,119J. Yoo,119D. Barge,120R. Bellan,120C. Campagnari,120 M. D’Alfonso,120T. Danielson,120K. Flowers,120P. Geffert,120J. Incandela,120C. Justus,120P. Kalavase,120 S. A. Koay,120D. Kovalskyi,120V. Krutelyov,120S. Lowette,120N. Mccoll,120V. Pavlunin,120F. Rebassoo,120 J. Ribnik,120J. Richman,120R. Rossin,120D. Stuart,120W. To,120C. West,120A. Apresyan,121A. Bornheim,121 Y. Chen,121E. Di Marco,121J. Duarte,121M. Gataullin,121Y. Ma,121A. Mott,121H. B. Newman,121C. Rogan,121 V. Timciuc,121P. Traczyk,121J. Veverka,121R. Wilkinson,121Y. Yang,121R. Y. Zhu,121B. Akgun,122R. Carroll,122 T. Ferguson,122Y. Iiyama,122D. W. Jang,122Y. F. Liu,122M. Paulini,122H. Vogel,122I. Vorobiev,122J. P. Cumalat,123 B. R. Drell,123C. J. Edelmaier,123W. T. Ford,123A. Gaz,123B. Heyburn,123E. Luiggi Lopez,123J. G. Smith,123
K. Stenson,123K. A. Ulmer,123S. R. Wagner,123J. Alexander,124A. Chatterjee,124N. Eggert,124L. K. Gibbons,124 B. Heltsley,124A. Khukhunaishvili,124B. Kreis,124N. Mirman,124G. Nicolas Kaufman,124J. R. Patterson,124
A. Ryd,124E. Salvati,124W. Sun,124W. D. Teo,124J. Thom,124J. Thompson,124J. Vaughan,124Y. Weng,124 L. Winstrom,124P. Wittich,124D. Winn,125S. Abdullin,126M. Albrow,126J. Anderson,126L. A. T. Bauerdick,126
A. Beretvas,126J. Berryhill,126P. C. Bhat,126I. Bloch,126K. Burkett,126J. N. Butler,126V. Chetluru,126 H. W. K. Cheung,126F. Chlebana,126V. D. Elvira,126I. Fisk,126J. Freeman,126Y. Gao,126D. Green,126O. Gutsche,126
J. Hanlon,126R. M. Harris,126J. Hirschauer,126B. Hooberman,126S. Jindariani,126M. Johnson,126U. Joshi,126 B. Kilminster,126B. Klima,126S. Kunori,126S. Kwan,126C. Leonidopoulos,126D. Lincoln,126R. Lipton,126 J. Lykken,126K. Maeshima,126J. M. Marraffino,126S. Maruyama,126D. Mason,126P. McBride,126K. Mishra,126 S. Mrenna,126Y. Musienko,126,aaaC. Newman-Holmes,126V. O’Dell,126O. Prokofyev,126E. Sexton-Kennedy,126 S. Sharma,126W. J. Spalding,126L. Spiegel,126P. Tan,126L. Taylor,126S. Tkaczyk,126N. V. Tran,126L. Uplegger,126 E. W. Vaandering,126R. Vidal,126J. Whitmore,126W. Wu,126F. Yang,126F. Yumiceva,126J. C. Yun,126D. Acosta,127
P. Avery,127D. Bourilkov,127M. Chen,127S. Das,127M. De Gruttola,127G. P. Di Giovanni,127D. Dobur,127 A. Drozdetskiy,127R. D. Field,127M. Fisher,127Y. Fu,127I. K. Furic,127J. Gartner,127J. Hugon,127B. Kim,127
J. Konigsberg,127A. Korytov,127A. Kropivnitskaya,127T. Kypreos,127J. F. Low,127K. Matchev,127 P. Milenovic,127,bbbG. Mitselmakher,127L. Muniz,127R. Remington,127A. Rinkevicius,127P. Sellers,127 N. Skhirtladze,127M. Snowball,127J. Yelton,127M. Zakaria,127V. Gaultney,128L. M. Lebolo,128S. Linn,128 P. Markowitz,128G. Martinez,128J. L. Rodriguez,128J. R. Adams,129T. Adams,129A. Askew,129J. Bochenek,129
J. Chen,129B. Diamond,129S. V. Gleyzer,129J. Haas,129S. Hagopian,129V. Hagopian,129M. Jenkins,129 K. F. Johnson,129H. Prosper,129V. Veeraraghavan,129M. Weinberg,129M. M. Baarmand,130B. Dorney,130 M. Hohlmann,130H. Kalakhety,130I. Vodopiyanov,130M. R. Adams,131I. M. Anghel,131L. Apanasevich,131 Y. Bai,131V. E. Bazterra,131R. R. Betts,131I. Bucinskaite,131J. Callner,131R. Cavanaugh,131C. Dragoiu,131 O. Evdokimov,131L. Gauthier,131C. E. Gerber,131D. J. Hofman,131S. Khalatyan,131F. Lacroix,131M. Malek,131
C. O’Brien,131C. Silkworth,131D. Strom,131N. Varelas,131U. Akgun,132E. A. Albayrak,132B. Bilki,132,ccc W. Clarida,132F. Duru,132S. Griffiths,132J.-P. Merlo,132H. Mermerkaya,132,dddA. Mestvirishvili,132A. Moeller,132
J. Nachtman,132C. R. Newsom,132E. Norbeck,132Y. Onel,132F. Ozok,132S. Sen,132E. Tiras,132J. Wetzel,132 T. Yetkin,132K. Yi,132B. A. Barnett,133B. Blumenfeld,133S. Bolognesi,133D. Fehling,133G. Giurgiu,133 A. V. Gritsan,133Z. J. Guo,133G. Hu,133P. Maksimovic,133S. Rappoccio,133M. Swartz,133A. Whitbeck,133
P. Baringer,134A. Bean,134G. Benelli,134O. Grachov,134R. P. Kenny Iii,134M. Murray,134D. Noonan,134 S. Sanders,134R. Stringer,134G. Tinti,134J. S. Wood,134V. Zhukova,134A. F. Barfuss,135T. Bolton,135 I. Chakaberia,135A. Ivanov,135S. Khalil,135M. Makouski,135Y. Maravin,135S. Shrestha,135I. Svintradze,135
J. Gronberg,136D. Lange,136D. Wright,136A. Baden,137M. Boutemeur,137B. Calvert,137S. C. Eno,137 J. A. Gomez,137N. J. Hadley,137R. G. Kellogg,137M. Kirn,137T. Kolberg,137Y. Lu,137M. Marionneau,137 A. C. Mignerey,137K. Pedro,137A. Peterman,137A. Skuja,137J. Temple,137M. B. Tonjes,137S. C. Tonwar,137
E. Twedt,137G. Bauer,138J. Bendavid,138W. Busza,138E. Butz,138I. A. Cali,138M. Chan,138V. Dutta,138 G. Gomez Ceballos,138M. Goncharov,138K. A. Hahn,138Y. Kim,138M. Klute,138K. Krajczar,138,eeeW. Li,138
P. D. Luckey,138T. Ma,138S. Nahn,138C. Paus,138D. Ralph,138C. Roland,138G. Roland,138M. Rudolph,138 G. S. F. Stephans,138F. Sto¨ckli,138K. Sumorok,138K. Sung,138D. Velicanu,138E. A. Wenger,138R. Wolf,138 B. Wyslouch,138S. Xie,138M. Yang,138Y. Yilmaz,138A. S. Yoon,138M. Zanetti,138S. I. Cooper,139B. Dahmes,139
A. De Benedetti,139G. Franzoni,139A. Gude,139S. C. Kao,139K. Klapoetke,139Y. Kubota,139J. Mans,139 N. Pastika,139R. Rusack,139M. Sasseville,139A. Singovsky,139N. Tambe,139J. Turkewitz,139L. M. Cremaldi,140
R. Kroeger,140L. Perera,140R. Rahmat,140D. A. Sanders,140E. Avdeeva,141K. Bloom,141S. Bose,141J. Butt,141 D. R. Claes,141A. Dominguez,141M. Eads,141J. Keller,141I. Kravchenko,141J. Lazo-Flores,141H. Malbouisson,141
S. Malik,141G. R. Snow,141U. Baur,142A. Godshalk,142I. Iashvili,142S. Jain,142A. Kharchilava,142A. Kumar,142 S. P. Shipkowski,142K. Smith,142G. Alverson,143E. Barberis,143D. Baumgartel,143M. Chasco,143J. Haley,143 D. Nash,143D. Trocino,143D. Wood,143J. Zhang,143A. Anastassov,144A. Kubik,144N. Mucia,144N. Odell,144 R. A. Ofierzynski,144B. Pollack,144A. Pozdnyakov,144M. Schmitt,144S. Stoynev,144M. Velasco,144S. Won,144
L. Antonelli,145D. Berry,145A. Brinkerhoff,145M. Hildreth,145C. Jessop,145D. J. Karmgard,145J. Kolb,145 K. Lannon,145W. Luo,145S. Lynch,145N. Marinelli,145D. M. Morse,145T. Pearson,145R. Ruchti,145J. Slaunwhite,145
N. Valls,145M. Wayne,145M. Wolf,145B. Bylsma,146L. S. Durkin,146A. Hart,146C. Hill,146R. Hughes,146 K. Kotov,146T. Y. Ling,146D. Puigh,146M. Rodenburg,146C. Vuosalo,146G. Williams,146B. L. Winer,146
N. Adam,147E. Berry,147P. Elmer,147D. Gerbaudo,147V. Halyo,147P. Hebda,147J. Hegeman,147A. Hunt,147 P. Jindal,147D. Lopes Pegna,147P. Lujan,147D. Marlow,147T. Medvedeva,147M. Mooney,147J. Olsen,147P. Piroue´,147
X. Quan,147A. Raval,147B. Safdi,147H. Saka,147D. Stickland,147C. Tully,147J. S. Werner,147A. Zuranski,147 J. G. Acosta,148E. Brownson,148X. T. Huang,148A. Lopez,148H. Mendez,148S. Oliveros,148J. E. Ramirez Vargas,148 A. Zatserklyaniy,148E. Alagoz,149V. E. Barnes,149D. Benedetti,149G. Bolla,149D. Bortoletto,149M. De Mattia,149
A. Everett,149Z. Hu,149M. Jones,149O. Koybasi,149M. Kress,149A. T. Laasanen,149N. Leonardo,149 V. Maroussov,149P. Merkel,149D. H. Miller,149N. Neumeister,149I. Shipsey,149D. Silvers,149A. Svyatkovskiy,149
M. Vidal Marono,149H. D. Yoo,149J. Zablocki,149Y. Zheng,149S. Guragain,150N. Parashar,150A. Adair,151 C. Boulahouache,151K. M. Ecklund,151F. J. M. Geurts,151B. P. Padley,151R. Redjimi,151J. Roberts,151J. Zabel,151
B. Betchart,152A. Bodek,152Y. S. Chung,152R. Covarelli,152P. de Barbaro,152R. Demina,152Y. Eshaq,152 A. Garcia-Bellido,152P. Goldenzweig,152J. Han,152A. Harel,152D. C. Miner,152D. Vishnevskiy,152M. Zielinski,152
A. Bhatti,153R. Ciesielski,153L. Demortier,153K. Goulianos,153G. Lungu,153S. Malik,153C. Mesropian,153 S. Arora,154A. Barker,154J. P. Chou,154C. Contreras-Campana,154E. Contreras-Campana,154D. Duggan,154 D. Ferencek,154Y. Gershtein,154R. Gray,154E. Halkiadakis,154D. Hidas,154A. Lath,154S. Panwalkar,154M. Park,154
R. Patel,154V. Rekovic,154J. Robles,154K. Rose,154S. Salur,154S. Schnetzer,154C. Seitz,154S. Somalwar,154 R. Stone,154S. Thomas,154G. Cerizza,155M. Hollingsworth,155S. Spanier,155Z. C. Yang,155A. York,155 R. Eusebi,156W. Flanagan,156J. Gilmore,156T. Kamon,156,fffV. Khotilovich,156R. Montalvo,156I. Osipenkov,156 Y. Pakhotin,156A. Perloff,156J. Roe,156A. Safonov,156T. Sakuma,156S. Sengupta,156I. Suarez,156A. Tatarinov,156
D. Toback,156N. Akchurin,157J. Damgov,157P. R. Dudero,157C. Jeong,157K. Kovitanggoon,157S. W. Lee,157 T. Libeiro,157Y. Roh,157I. Volobouev,157E. Appelt,158C. Florez,158S. Greene,158A. Gurrola,158W. Johns,158 C. Johnston,158P. Kurt,158C. Maguire,158A. Melo,158P. Sheldon,158B. Snook,158S. Tuo,158J. Velkovska,158
M. W. Arenton,159M. Balazs,159S. Boutle,159B. Cox,159B. Francis,159J. Goodell,159R. Hirosky,159 A. Ledovskoy,159C. Lin,159C. Neu,159J. Wood,159R. Yohay,159S. Gollapinni,160R. Harr,160P. E. Karchin,160
C. Kottachchi Kankanamge Don,160P. Lamichhane,160A. Sakharov,160M. Anderson,161M. Bachtis,161 D. Belknap,161L. Borrello,161D. Carlsmith,161M. Cepeda,161S. Dasu,161L. Gray,161K. S. Grogg,161M. Grothe,161
R. Hall-Wilton,161M. Herndon,161A. Herve´,161P. Klabbers,161J. Klukas,161A. Lanaro,161C. Lazaridis,161 J. Leonard,161R. Loveless,161A. Mohapatra,161I. Ojalvo,161F. Palmonari,161G. A. Pierro,161I. Ross,161A. Savin,161
W. H. Smith,161and J. Swanson161 (CMS Collaboration)
1Yerevan Physics Institute, Yerevan, Armenia 2Institut fu¨r Hochenergiephysik der OeAW, Wien, Austria 3
National Centre for Particle and High Energy Physics, Minsk, Belarus
4Universiteit Antwerpen, Antwerpen, Belgium 5Vrije Universiteit Brussel, Brussel, Belgium 6Universite´ Libre de Bruxelles, Bruxelles, Belgium
7Ghent University, Ghent, Belgium
8Universite´ Catholique de Louvain, Louvain-la-Neuve, Belgium 9Universite´ de Mons, Mons, Belgium
10Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil 11Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil 12Instituto de Fisica Teorica, Universidade Estadual Paulista, Sao Paulo, Brazil
13Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria 14University of Sofia, Sofia, Bulgaria
15Institute of High Energy Physics, Beijing, China
16State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China 17Universidad de Los Andes, Bogota, Colombia
18Technical University of Split, Split, Croatia 19
University of Split, Split, Croatia
20Institute Rudjer Boskovic, Zagreb, Croatia 21University of Cyprus, Nicosia, Cyprus 22Charles University, Prague, Czech Republic
23Academy of Scientific Research and Technology of the Arab Republic of Egypt,
24National Institute of Chemical Physics and Biophysics, Tallinn, Estonia 25Department of Physics, University of Helsinki, Helsinki, Finland
26Helsinki Institute of Physics, Helsinki, Finland 27Lappeenranta University of Technology, Lappeenranta, Finland
28DSM/IRFU, CEA/Saclay, Gif-sur-Yvette, France
29Laboratoire Leprince-Ringuet, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
30Institut Pluridisciplinaire Hubert Curien, Universite´ de Strasbourg, Universite´ de Haute Alsace Mulhouse, CNRS/IN2P3,
Strasbourg, France
31
Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules (IN2P3), Villeurbanne, France
32Universite´ de Lyon, Universite´ Claude Bernard Lyon 1, CNRS-IN2P3, Institut de Physique Nucle´aire de Lyon, Villeurbanne, France 33E. Andronikashvili Institute of Physics, Academy of Science, Tbilisi, Georgia
34RWTH Aachen University, I. Physikalisches Institut, Aachen, Germany 35RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany 36RWTH Aachen University, III. Physikalisches Institut B, Aachen, Germany
37Deutsches Elektronen-Synchrotron, Hamburg, Germany 38University of Hamburg, Hamburg, Germany 39Institut fu¨r Experimentelle Kernphysik, Karlsruhe, Germany 40Institute of Nuclear Physics ‘‘Demokritos,’’ Aghia Paraskevi, Greece
41University of Athens, Athens, Greece 42University of Ioa´nnina, Ioa´nnina, Greece
43KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary 44Institute of Nuclear Research ATOMKI, Debrecen, Hungary
45University of Debrecen, Debrecen, Hungary 46Panjab University, Chandigarh, India
47
University of Delhi, Delhi, India
48Saha Institute of Nuclear Physics, Kolkata, India 49Bhabha Atomic Research Centre, Mumbai, India 50Tata Institute of Fundamental Research-EHEP, Mumbai, India 51Tata Institute of Fundamental Research-HECR, Mumbai, India 52Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
53aINFN Sezione di Bari, Bari, Italy 53bUniversita` di Bari, Bari, Italy 53cPolitecnico di Bari, Bari, Italy 54aINFN Sezione di Bologna, Bologna, Italy
54bUniversita` di Bologna, Bologna, Italy 55aINFN Sezione di Catania, Catania, Italy
55bUniversita` di Catania, Catania, Italy 56aINFN Sezione di Firenze, Firenze, Italy
56bUniversita` di Firenze, Firenze, Italy
57INFN Laboratori Nazionali di Frascati, Frascati, Italy 58INFN Sezione di Genova, Genova, Italy 59aINFN Sezione di Milano-Bicocca, Milano, Italy
59bUniversita` di Milano-Bicocca, Milano, Italy 60aINFN Sezione di Napoli, Napoli, Italy 60bUniversita` di Napoli ‘‘Federico II,’’ Napoli, Italy
61aINFN Sezione di Padova, Padova, Italy 61bUniversita` di Padova, Padova, Italy 61c
Universita` di Trento (Trento), Padova, Italy
62aINFN Sezione di Pavia, Pavia, Italy 62bUniversita` di Pavia, Pavia, Italy 63aINFN Sezione di Perugia, Perugia, Italy
63bUniversita` di Perugia, Perugia, Italy 64aINFN Sezione di Pisa, Pisa, Italy
64bUniversita` di Pisa, Pisa, Italy 64cScuola Normale Superiore di Pisa, Pisa, Italy
65aINFN Sezione di Roma, Roma, Italy 65b
Universita` di Roma ‘‘La Sapienza,’’ Roma, Italy
66aINFN Sezione di Torino, Torino, Italy 66bUniversita` di Torino, Torino, Italy
66cUniversita` del Piemonte Orientale (Novara), Torino, Italy 67aINFN Sezione di Trieste, Trieste, Italy
67bUniversita` di Trieste, Trieste, Italy 68Kangwon National University, Chunchon, Korea
69Kyungpook National University, Daegu, Korea
70Chonnam National University, Institute for Universe and Elementary Particles, Kwangju, Korea 71Korea University, Seoul, Korea
72University of Seoul, Seoul, Korea 73Sungkyunkwan University, Suwon, Korea
74Vilnius University, Vilnius, Lithuania 75
Centro de Investigacion y de Estudios Avanzados del IPN, Mexico City, Mexico
76Universidad Iberoamericana, Mexico City, Mexico 77Benemerita Universidad Autonoma de Puebla, Puebla, Mexico 78Universidad Auto´noma de San Luis Potosı´, San Luis Potosı´, Mexico
79University of Auckland, Auckland, New Zealand 80University of Canterbury, Christchurch, New Zealand
81National Centre for Physics, Quaid-I-Azam University, Islamabad, Pakistan 82Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
83Soltan Institute for Nuclear Studies, Warsaw, Poland
84Laborato´rio de Instrumentac¸a˜o e Fı´sica Experimental de Partı´culas, Lisboa, Portugal 85Joint Institute for Nuclear Research, Dubna, Russia
86Petersburg Nuclear Physics Institute, Gatchina (St. Petersburg), Russia 87Institute for Nuclear Research, Moscow, Russia
88Institute for Theoretical and Experimental Physics, Moscow, Russia 89Moscow State University, Moscow, Russia
90P.N. Lebedev Physical Institute, Moscow, Russia 91
State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, Russia
92University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade, Serbia 93Centro de Investigaciones Energe´ticas Medioambientales y Tecnolo´gicas (CIEMAT), Madrid, Spain
94Universidad Auto´noma de Madrid, Madrid, Spain 95Universidad de Oviedo, Oviedo, Spain
96Instituto de Fı´sica de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander, Spain 97CERN, European Organization for Nuclear Research, Geneva, Switzerland
98Paul Scherrer Institut, Villigen, Switzerland
99Institute for Particle Physics, ETH Zurich, Zurich, Switzerland 100Universita¨t Zu¨rich, Zurich, Switzerland
101National Central University, Chung-Li, Taiwan 102National Taiwan University (NTU), Taipei, Taiwan
103Cukurova University, Adana, Turkey
104Middle East Technical University, Physics Department, Ankara, Turkey 105Bogazici University, Istanbul, Turkey
106Istanbul Technical University, Istanbul, Turkey
107National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov, Ukraine 108University of Bristol, Bristol, United Kingdom
109Rutherford Appleton Laboratory, Didcot, United Kingdom 110Imperial College, London, United Kingdom 111Brunel University, Uxbridge, United Kingdom
112Baylor University, Waco, Texas, USA
113The University of Alabama, Tuscaloosa, Alabama, USA 114
Boston University, Boston, Massachusetts, USA
115Brown University, Providence, Rhode Island, USA 116University of California, Davis, Davis, California, USA 117University of California, Los Angeles, Los Angeles, California, USA
118University of California, Riverside, Riverside, California, USA 119University of California, San Diego, La Jolla, California, USA 120University of California, Santa Barbara, Santa Barbara, California, USA
121California Institute of Technology, Pasadena, California, USA 122Carnegie Mellon University, Pittsburgh, Pennsylvania, USA 123
University of Colorado at Boulder, Boulder, Colorado, USA
124Cornell University, Ithaca, New York, USA 125Fairfield University, Fairfield, Connecticut, USA 126Fermi National Accelerator Laboratory, Batavia, Illinois, USA
