Erratum to: Differential branching fraction and angular analysis of Λb0 → Λμ+μ− decays

JHEP09(2018)145

Received: August 17, 2018 Accepted: September 12, 2018 Published: September 26, 2018

Erratum: Differential branching fraction and angular

analysis of Λ

0

_b

→ Λµ

+

µ

−

decays

The LHCb collaboration

E-mail:

luca.pescatore@cern.ch

Erratum to:

JHEP06(2015)115

ArXiv ePrint:

1503.07138

JHEP09(2018)145

The angular distribution of the dimuon system of the decays Λ

→ Λµ

_µ

_{and Λ}

b

→ Λµ

µ

can be described by

dΓ

d cos θ

=

3

8

(1 + cos

_θ

)(1 − f

) + A

cos θ

+

3

4

f

sin

_θ

,

(1)

where A

is the forward-backward asymmetry of the dimuon system and f

is its

longitu-dinal polarisation fraction. For the Λ

decay, the angle θ

is calculated as the angle between

the direction of the µ

lepton, in the rest frame of the dimuon pair, and the direction of

the dimuon pair, in the rest frame of the Λ

decay. The forward-backward asymmetry of

the lepton pair, A

, is “odd” under CP conjugation and changes in sign between the Λ

and Λ

decays. To compensate for this sign, the angle θ

is usually calculated from the

µ

lepton rather than the µ

lepton such that A

can be calculated from the combined

sample. This was the intended approach of this paper. Unfortunately, A

FB

was determined

using the µ

lepton when determining θ

for both the Λ

and the Λ

decays. Consequently,

the value of A

in this paper corresponds to a difference A(A

) in asymmetries between

the Λ

b

and Λ

decays rather than a proper average and is expected to be zero if CP is

conserved. The result quoted as A

in this paper should therefore be interpreted as

A(A

) = −0.05 ± 0.09 (stat) ± 0.03 (syst) ,

(2)

and is indeed consistent with the Standard Model expectation that CP violating effects

should be small in the decay Λ

→ Λµ

_µ

_{. This is in itself a useful result. A measurement}

of A

has since been presented in ref. [

1

]. The results in ref. [

1

] supersede the

corre-sponding results in this paper. Note, the mistake in the angular definition only affects the

value of A

presented in the paper. The values of f

, A

and the differential branching

fraction are unchanged, due to the symmetry of the efficiency model in cos θ

.

Open Access.

This article is distributed under the terms of the Creative Commons

Attribution License (

CC-BY 4.0

), which permits any use, distribution and reproduction in

any medium, provided the original author(s) and source are credited.

References

[1] LHCb collaboration, Angular moments of the decay Λ0 b → Λµ

+_µ− _{at low hadronic recoil,}

JHEP09(2018)145

The LHCb collaboration

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JHEP09(2018)145

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JHEP09(2018)145

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A. Zhelezov11_{, A. Zhokhov}31 _{and L. Zhong}3

1

Centro Brasileiro de Pesquisas F´ısicas (CBPF), Rio de Janeiro, Brazil 2 _{Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil} 3 _{Center for High Energy Physics, Tsinghua University, Beijing, China}

4 _{LAPP, Universit´e Savoie Mont-Blanc, CNRS/IN2P3, Annecy-Le-Vieux, France}

5 _{Clermont Universit´e, Universit´e Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France} 6 _{CPPM, Aix-Marseille Universit´e, CNRS/IN2P3, Marseille, France}

7

LAL, Universit´e Paris-Sud, CNRS/IN2P3, Orsay, France 8

LPNHE, Universit´e Pierre et Marie Curie, Universit´e Paris Diderot, CNRS/IN2P3, Paris, France 9

Fakult¨at Physik, Technische Universit¨at Dortmund, Dortmund, Germany 10

Max-Planck-Institut f¨ur Kernphysik (MPIK), Heidelberg, Germany 11

Physikalisches Institut, Ruprecht-Karls-Universit¨at Heidelberg, Heidelberg, Germany 12

School of Physics, University College Dublin, Dublin, Ireland 13

Sezione INFN di Bari, Bari, Italy 14 _{Sezione INFN di Bologna, Bologna, Italy} 15 _{Sezione INFN di Cagliari, Cagliari, Italy} 16 _{Sezione INFN di Ferrara, Ferrara, Italy} 17 _{Sezione INFN di Firenze, Firenze, Italy}

18 _{Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy} 19

Sezione INFN di Genova, Genova, Italy 20

Sezione INFN di Milano Bicocca, Milano, Italy 21

Sezione INFN di Milano, Milano, Italy 22

Sezione INFN di Padova, Padova, Italy 23

Sezione INFN di Pisa, Pisa, Italy 24

Sezione INFN di Roma Tor Vergata, Roma, Italy 25

Sezione INFN di Roma La Sapienza, Roma, Italy

26 _{Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Krak´ow, Poland} 27 _{AGH — University of Science and Technology, Faculty of Physics and Applied Computer Science,}

Krak´ow, Poland

JHEP09(2018)145

Romania 30

Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia 31

Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia 32

Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia 33

Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia 34

Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia

35

Institute for High Energy Physics (IHEP), Protvino, Russia 36 _{Universitat de Barcelona, Barcelona, Spain}

37 _{Universidad de Santiago de Compostela, Santiago de Compostela, Spain} 38 _{European Organization for Nuclear Research (CERN), Geneva, Switzerland} 39 _{Ecole Polytechnique F´ed´erale de Lausanne (EPFL), Lausanne, Switzerland} 40 _{Physik-Institut, Universit¨at Z¨urich, Z¨urich, Switzerland}

41

Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands 42

Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands

43

NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine 44

Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine 45

University of Birmingham, Birmingham, United Kingdom 46

H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom 47 _{Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom} 48 _{Department of Physics, University of Warwick, Coventry, United Kingdom} 49 _{STFC Rutherford Appleton Laboratory, Didcot, United Kingdom}

50 _{School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom} 51 _{School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom} 52

Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom 53

Imperial College London, London, United Kingdom 54

School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom 55

Department of Physics, University of Oxford, Oxford, United Kingdom 56

Massachusetts Institute of Technology, Cambridge, MA, United States 57

University of Cincinnati, Cincinnati, OH, United States 58

University of Maryland, College Park, MD, United States 59 _{Syracuse University, Syracuse, NY, United States}

60 _{Pontif´ıcia Universidade Cat´olica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil, associated} to2

61 _{Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China, associated} to3

62

Departamento de Fisica , Universidad Nacional de Colombia, Bogota, Colombia, associated to8 63

Institut f¨ur Physik, Universit¨at Rostock, Rostock, Germany, associated to 11 64

National Research Centre Kurchatov Institute, Moscow, Russia, associated to31 65

Yandex School of Data Analysis, Moscow, Russia, associated to31 66

Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain, associated to36

67

Van Swinderen Institute, University of Groningen, Groningen, The Netherlands, associated to 41 a _{Universidade Federal do Triˆangulo Mineiro (UFTM), Uberaba-MG, Brazil}

b _{P.N. Lebedev Physical Institute, Russian Academy of Science (LPI RAS), Moscow, Russia} c _{Universit`a di Bari, Bari, Italy}

d _{Universit`a di Bologna, Bologna, Italy} e

Universit`a di Cagliari, Cagliari, Italy f

JHEP09(2018)145

h _{Universit`a di Urbino, Urbino, Italy} i

Universit`a di Modena e Reggio Emilia, Modena, Italy j

Universit`a di Genova, Genova, Italy k

Universit`a di Milano Bicocca, Milano, Italy l

Universit`a di Roma Tor Vergata, Roma, Italy m

Universit`a di Roma La Sapienza, Roma, Italy n

Universit`a della Basilicata, Potenza, Italy o

AGH — University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, Krak´ow, Poland

p _{LIFAELS, La Salle, Universitat Ramon Llull, Barcelona, Spain} q _{Hanoi University of Science, Hanoi, Viet Nam}

r _{Universit`a di Padova, Padova, Italy</sub> s <sub>Universit`a di Pisa, Pisa, Italy} t

Scuola Normale Superiore, Pisa, Italy u

Universit`a degli Studi di Milano, Milano, Italy v