Measurement of the branching ratio Γ(Λb                             0→ψ(2S)Λ0)/Γ(Λb                             0→J/ψΛ0) with the ATLAS detector

ATLAS Collaboration

doi:10.1016/j.physletb.2015.10.009

Measurement of the branching ratio Γ(Λ_b ⁰→ψ(2S)Λ⁰)/Γ(Λ_b ⁰→J/ψΛ⁰) with the ATLAS detector

ATLAS Collaboration

Aix-Marseille Université
University of Oklahoma
Academia Sinica - Institute of Physics
Azerbaijan National Academy of Sciences
University of Amsterdam
Michigan State University
University of Toronto
Tel Aviv University
Technion-Israel Institute of Technology
University of Oregon
Stockholm University
Oskar Klein Centre
National Institute for Nuclear Physics
Abdus Salam International Centre for Theoretical Physics
King's College London
AGH University of Science and Technology
Brookhaven National Laboratory
Northern Illinois University
Ludwig Maximilian University of Munich
Rutherford Appleton Laboratory
University of Liverpool
University of Belgrade
University of Göttingen
Laboratório de Instrumentação e Física Experimental de Partículas
University of Granada
Boston University
Joint Institute for Nuclear Research
University of Rome Tor Vergata
Lund University
RAS - P.N. Lebedev Physics Institute
University of Bologna
University of Victoria BC
Université Grenoble Alpes
Consejo Nacional de Investigaciones Científicas y Técnicas
CERN
Horia Hulubei National Institute of Physics and Nuclear Engineering
National Technical University of Athens
The University of Chicago
Columbia University
University of Sussex
University of Naples Federico II
University of Copenhagen
Queen Mary University of London
University of Udine
University of Valencia
University of California at Berkeley
High Energy Accelerator Research Organization, Tsukuba
Universidade Federal do Rio de Janeiro
Brandeis University
University of Michigan, Ann Arbor
University of Coimbra
University of Lisbon
University of Freiburg
University of Sheffield
University of Geneva
Heidelberg University
University of Milan
National and Kapodistrian University of Athens
Technische Universität Dresden
RAS - Budker Institute of Nuclear Physics
Novosibirsk State University
Autonomous University of Barcelona
University of Pisa
Moscow Engineering Physics Institute
Slovak Academy of Sciences
University of Birmingham
Duke University
University of Montreal
German Electron Synchrotron
Bogazici University
Universidad Autónoma de Madrid
University of Cambridge
University of Bonn
Alikhanov Institute for Theoretical and Experimental Physics
The University of Tokyo
Comenius University
University of Illinois
University of Siegen
Czech Technical University in Prague
University of Johannesburg
Université Paris-Saclay
TRIUMF
Roma Tre University
CEA-IRFU/CNRS/Université Paris Diderot
Aristotle University of Thessaloniki
University of Rome La Sapienza
CAS - Institute of High Energy Physics
Yale University
Charles University
Stony Brook University
University of Manchester
Cracow
University of Wisconsin-Madison
University of Wuppertal
University of Melbourne
University of Genoa
Max Planck Institute for Physics (Werner Heisenberg Institute)
SLAC National Accelerator Laboratory
Université Savoie Mont Blanc
University of Oxford
Harvard University
Lancaster University
Russian Research Centre Kurchatov Institute
University of Glasgow
University of California at Santa Cruz
California State University Fresno
Ohio State University
CNRS/IN2P3
Tufts University
University of Bern
University of Fribourg
Johannes Gutenberg University Mainz
University of Warwick
Gaziantep University
McGill University
Carleton University
University of Massachusetts
University of Hassan II Casablanca
York University Toronto
Uppsala University
New York University
Royal Holloway University of London
University of Pittsburgh
Humboldt University of Berlin
University College London
University of Sydney
University of Washington
Argonne National Laboratory
Lomonosov Moscow State University
Institute for High Energy Physics
Chinese University of Hong Kong
The University of Hong Kong
Hong Kong University of Science and Technology
SUNY Albany
Université Clermont Auvergne
Oklahoma State University
University of Texas at Arlington
Tokyo Metropolitan University
University of Pennsylvania School of Arts and Sciences
Weizmann Institute of Science
University of the Witwatersrand
University of Edinburgh
Universidad Técnica Federico Santa Maria
University of Bergen
Simon Fraser University
University of Oslo
TU Dortmund University
University of Alberta
University of Calabria
Ankara University
Shanghai Jiao Tong University
Southern Methodist University
Radboud University Nijmegen
Pontificia Universidad Católica de Chile
University of Porto
Universidade Federal de Juiz de Fora
Dogus University
Tomsk State University
Iowa State University
Shandong University
Nanjing University
Tsinghua University
Kobe University
Mohammed V University in Rabat
University of Arizona
Indiana University Bloomington
Czech Academy of Sciences
Palacký University Olomouc
University of Ljubljana
University of Pavia
University of Naples Parthenope
Institute of Particle Physics
University of California at Irvine
University of British Columbia
Mohamed I University
Tbilisi State University
Universidade Federal de São João del-Rei
Universidade de São Paulo
Justus Liebig University Giessen
Cadi Ayyad University
Osaka University
Peter the Great St. Petersburg Polytechnic University
Nagasaki Institute of Applied Science
University of Science and Technology of China
National Center for Energy, Nuclear Science and Technology
University of New Mexico
University of Salento
Louisiana Tech University
ICREA
A. Alikhanian Yerevan Institute of Physics
University of Cape Town
University of Tsukuba
Belarus Academy of Sciences
Shinshu University
Tokyo Institute of Technology
Nagoya University
Belarusian State University
National Tsing Hua University
Waseda University
The University of Texas at Austin
Kyoto University
University of Texas at Dallas
University of Adelaide
Innsbruck Medical University
Ivane Javakhishvili Tbilisi State University
Ilia State University
Kyushu University
Georgian Technical University
Manhattan College
Istanbul Aydin University
University of Würzburg
Hellenic Open University
Universidad Antonio Nariño
KTH Royal Institute of Technology
University of Iowa
Hampton University
Moscow Institute of Physics and Technology
Hiroshima Institute of Technology
Okayama University
University of Minho
Universidad de Buenos Aires
Jagiellonian University in Kraków
International School for Advanced Studies
National Institute for Research and Development of Isotopic and Molecular Technologies
University of South Carolina
IN2P3 - Institut National de Physique Nucléaire et de Physique Des Particules
Sun Yat-Sen University
TOBB University of Economics and Technology
Kyoto University of Education
Massachusetts Institute of Technology
Stanford University
Wigner Research Centre for Physics
University of Malaya

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

An observation of the Λ_b ⁰→ψ(2S)Λ⁰ decay and a comparison of its branching fraction with that of the Λ_b ⁰→J/ψΛ⁰ decay has been made with the ATLAS detector in proton–proton collisions at s=8 TeV at the LHC using an integrated luminosity of 20.6 fb⁻¹. The J/ψ and ψ(2S) mesons are reconstructed in their decays to a muon pair, while the Λ⁰→pπ⁻ decay is exploited for the Λ⁰ baryon reconstruction. The Λ_b ⁰ baryons are reconstructed with transverse momentum p_T>10 GeV and pseudorapidity |η|<2.1. The measured branching ratio of the Λ_b ⁰→ψ(2S)Λ⁰ and Λ_b ⁰→J/ψΛ⁰ decays is Γ(Λ_b ⁰→ψ(2S)Λ⁰)/Γ(Λ_b ⁰→J/ψΛ⁰)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.

Original language	English
Pages (from-to)	63-80
Number of pages	18
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	751
DOIs	https://doi.org/10.1016/j.physletb.2015.10.009
Publication status	Published - 17 Dec 2015

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2015.10.009

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@article{5d05f3a3de2f4cf88afaf39b02d55383,

title = "Measurement of the branching ratio Γ(Λb 0→ψ(2S)Λ0)/Γ(Λb 0→J/ψΛ0) with the ATLAS detector",

abstract = "An observation of the Λb 0→ψ(2S)Λ0 decay and a comparison of its branching fraction with that of the Λb 0→J/ψΛ0 decay has been made with the ATLAS detector in proton–proton collisions at s=8 TeV at the LHC using an integrated luminosity of 20.6 fb−1. The J/ψ and ψ(2S) mesons are reconstructed in their decays to a muon pair, while the Λ0→pπ− decay is exploited for the Λ0 baryon reconstruction. The Λb 0 baryons are reconstructed with transverse momentum pT>10 GeV and pseudorapidity |η|<2.1. The measured branching ratio of the Λb 0→ψ(2S)Λ0 and Λb 0→J/ψΛ0 decays is Γ(Λb 0→ψ(2S)Λ0)/Γ(Λb 0→J/ψΛ0)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.",

author = "\{ATLAS Collaboration\} and G. Aad and B. Abbott and J. Abdallah and O. Abdinov and R. Aben and M. Abolins and AbouZeid, \{O. S.\} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, \{B. S.\} and L. Adamczyk and Adams, \{D. L.\} and J. Adelman and S. Adomeit and T. Adye and Affolder, \{A. A.\} and T. Agatonovic-Jovin and J. Agricola and Aguilar-Saavedra, \{J. A.\} and Ahlen, \{S. P.\} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, \{T. P.A.\} and Akimov, \{A. V.\} and Alberghi, \{G. L.\} and J. Albert and S. Albrand and \{Alconada Verzini\}, \{M. J.\} and M. Aleksa and Aleksandrov, \{I. N.\} and C. Alexa and G. Alexander and T. Alexopoulos and M. Alhroob and G. Alimonti and L. Alio and J. Alison and Alkire, \{S. P.\} and Allbrooke, \{B. M.M.\} and Allport, \{P. P.\} and A. Aloisio and A. Alonso and F. Alonso and C. Alpigiani and Connell, \{S. H.\} and N. Govender and L. Truong",

note = "Publisher Copyright: {\textcopyright} 2015 CERN for the benefit of the ATLAS Collaboration",

year = "2015",

month = dec,

day = "17",

doi = "10.1016/j.physletb.2015.10.009",

language = "English",

volume = "751",

pages = "63--80",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Measurement of the branching ratio Γ(Λb 0→ψ(2S)Λ0)/Γ(Λb 0→J/ψΛ0) with the ATLAS detector

AU - ATLAS Collaboration

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdinov, O.

AU - Aben, R.

AU - Abolins, M.

AU - AbouZeid, O. S.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Adamczyk, L.

AU - Adams, D. L.

AU - Adelman, J.

AU - Adomeit, S.

AU - Adye, T.

AU - Affolder, A. A.

AU - Agatonovic-Jovin, T.

AU - Agricola, J.

AU - Aguilar-Saavedra, J. A.

AU - Ahlen, S. P.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akerstedt, H.

AU - Åkesson, T. P.A.

AU - Akimov, A. V.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albrand, S.

AU - Alconada Verzini, M. J.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexander, G.

AU - Alexopoulos, T.

AU - Alhroob, M.

AU - Alimonti, G.

AU - Alio, L.

AU - Alison, J.

AU - Alkire, S. P.

AU - Allbrooke, B. M.M.

AU - Allport, P. P.

AU - Aloisio, A.

AU - Alonso, A.

AU - Alonso, F.

AU - Alpigiani, C.

AU - Connell, S. H.

AU - Govender, N.

AU - Truong, L.

PY - 2015/12/17

Y1 - 2015/12/17

N2 - An observation of the Λb 0→ψ(2S)Λ0 decay and a comparison of its branching fraction with that of the Λb 0→J/ψΛ0 decay has been made with the ATLAS detector in proton–proton collisions at s=8 TeV at the LHC using an integrated luminosity of 20.6 fb−1. The J/ψ and ψ(2S) mesons are reconstructed in their decays to a muon pair, while the Λ0→pπ− decay is exploited for the Λ0 baryon reconstruction. The Λb 0 baryons are reconstructed with transverse momentum pT>10 GeV and pseudorapidity |η|<2.1. The measured branching ratio of the Λb 0→ψ(2S)Λ0 and Λb 0→J/ψΛ0 decays is Γ(Λb 0→ψ(2S)Λ0)/Γ(Λb 0→J/ψΛ0)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.

AB - An observation of the Λb 0→ψ(2S)Λ0 decay and a comparison of its branching fraction with that of the Λb 0→J/ψΛ0 decay has been made with the ATLAS detector in proton–proton collisions at s=8 TeV at the LHC using an integrated luminosity of 20.6 fb−1. The J/ψ and ψ(2S) mesons are reconstructed in their decays to a muon pair, while the Λ0→pπ− decay is exploited for the Λ0 baryon reconstruction. The Λb 0 baryons are reconstructed with transverse momentum pT>10 GeV and pseudorapidity |η|<2.1. The measured branching ratio of the Λb 0→ψ(2S)Λ0 and Λb 0→J/ψΛ0 decays is Γ(Λb 0→ψ(2S)Λ0)/Γ(Λb 0→J/ψΛ0)=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.

UR - https://www.scopus.com/pages/publications/85042517730

U2 - 10.1016/j.physletb.2015.10.009

DO - 10.1016/j.physletb.2015.10.009

M3 - Article

AN - SCOPUS:85042517730

SN - 0370-2693

VL - 751

SP - 63

EP - 80

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Measurement of the branching ratio Γ(Λ_b ⁰→ψ(2S)Λ⁰)/Γ(Λ_b ⁰→J/ψΛ⁰) with the ATLAS detector

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