Measurement of fs /fu Variation with Proton-Proton Collision Energy and B -Meson Kinematics

LHCb Collaboration

doi:10.1103/PhysRevLett.124.122002

Measurement of fs /fu Variation with Proton-Proton Collision Energy and B -Meson Kinematics

LHCb Collaboration

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University of Zurich
Universidade de Santiago de Compostela
University of Bristol
Syracuse University
University of Michigan, Ann Arbor
Clermont-Auvergne University
University of Cincinnati
LNF-INFN
University of Dortmund
European Organization for Nuclear Research
University of Glasgow
University of Barcelona
Petersburg Nuclear Physics Institute (PNPI)
Imperial College London
Instituto de Biofisica da UFRJ
Laboratoire de l'Accélérateur Linéaire
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
ENAC-IIC-GEL
Sezione INFN di Ferrara
University of Maryland, College Park
Aix-Marseille Université
Kurchatov Institute
Yandex School of Data Analysis
Sezione INFN di Cagliari
University of Heidelberg
University of Warwick
University of Manchester
Sezione di Genova
University of Genoa
Institute for Theoretical and Experimental Physics
National University of Science and Technology “MISIS”
National Centre for Nuclear Research (NCBJ)
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Centro Brasileiro de Pesquisas Fisicas
University of Chinese Academy of Sciences
Sorbonne Université
RWTH Aachen University
Moscow State University
INFN
INFN Sezione di Bologna
University of Bologna
University of Cambridge
Institute for Nuclear Physics
University of Birmingham
University of Modena and Reggio Emilia
University of Oxford
Sezione di Roma
Massachusetts Institute of Technology
National Research University
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
University of Liverpool
Tsinghua University
Wuhan University
University of Ferrara
INFN Sezione di Milano-Bicocca
University of Milano-Bicocca
Universitat Ramon LLull - CSIC
INFN Roma Tor Vergata
University of Pisa
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
University of Edinburgh
Horia Hulubei National Institute of Physics and Nuclear Engineering
MST-8, Los Alamos National Laboratory
INFN Sezione di Bari
Università degli studi di Bari Aldo Moro
Max-Planck-Institut für Kernphysik
Agh University of Science and Technology Faculty of Computer Science
Universitá di Cagliari
Central China Normal University
INFN Sezione di Trieste
Kharkov Institute of Physics and Technology
CCLRC Rutherford Appleton Laboratory
Institute for Nuclear Research of the Russian Academy of Sciences
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University of Milano
University of Valencia
Pontifícia Universidade Católica do Rio de Janeiro
Universidade Federal Do Triângulo Mineiro (UFTM)
Universität Rostock
Univ. Mentouri de Constantine
Vrije Universiteit Amsterdam
National Research Tomsk Polytechnic University
Institute of Nuclear Research, National Academy of Sciences in Ukraine
South China Normal University
Lanzhou University
Institute of High Energy Physics, Chinese Academy of Sciences
Kurchatov Institute
University of Padova
Iligan Institute of Technology (IIT)
University College Dublin
Universidad Nacional de Colombia
Scuola Normale Superiore di Pisa
Hanoi University of Science and Technology
ICS/University of Groningen
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
University of Rome “Tor Vergata”
University of Rome
Università degli Studi della Basilicata
University of Urbino Carlo Bo
Hunan University
Shaanxi Normal University

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

The ratio of the Bs0 and B+ fragmentation fractions fs and fu is studied with Bs0→J/ψφ and B+→J/ψK+ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV center-of-mass energies. The analysis is performed in bins of B-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity, and rapidity. The fragmentation-fraction ratio fs/fu is observed to depend on the B-meson transverse momentum with a significance of 6.0σ. This dependency is driven by the 13 TeV sample (8.7σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8σ evidence for an increase of fs/fu as a function of collision energy.

langue originale	Anglais
Numéro d'article	122002
journal	Physical Review Letters
Volume	124
Numéro de publication	12
Les DOIs	https://doi.org/10.1103/PhysRevLett.124.122002
état	Publié - 27 mars 2020

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10.1103/PhysRevLett.124.122002

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@article{a14d4271b6434bb49805f856d6d8f047,

title = "Measurement of fs /fu Variation with Proton-Proton Collision Energy and B -Meson Kinematics",

abstract = "The ratio of the Bs0 and B+ fragmentation fractions fs and fu is studied with Bs0→J/ψφ and B+→J/ψK+ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV center-of-mass energies. The analysis is performed in bins of B-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity, and rapidity. The fragmentation-fraction ratio fs/fu is observed to depend on the B-meson transverse momentum with a significance of 6.0σ. This dependency is driven by the 13 TeV sample (8.7σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8σ evidence for an increase of fs/fu as a function of collision energy.",

author = "\{LHCb Collaboration\} and R. Aaij and Beteta, \{C. Abell{\'a}n\} and B. Adeva and M. Adinolfi and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and Albero, \{A. Alfonso\} and G. Alkhazov and Cartelle, \{P. Alvarez\} and Alves, \{A. A.\} and S. Amato and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, \{J. E.\} and F. Archilli and Romeu, \{J. Arnau\} and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and Back, \{J. J.\} and S. Baker and V. Balagura and W. Baldini and A. Baranov and Barlow, \{R. J.\} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and V. Batozskaya and B. Batsukh and A. Battig and V. Battista and A. Bay and F. Bedeschi and I. Bediaga and F. Fleuret and E. Maurice",

note = "Publisher Copyright: {\textcopyright} 2020 CERN.",

year = "2020",

month = mar,

day = "27",

doi = "10.1103/PhysRevLett.124.122002",

language = "English",

volume = "124",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "12",

}

TY - JOUR

T1 - Measurement of fs /fu Variation with Proton-Proton Collision Energy and B -Meson Kinematics

AU - LHCb Collaboration

AU - Aaij, R.

AU - Beteta, C. Abellán

AU - Adeva, B.

AU - Adinolfi, M.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Albero, A. Alfonso

AU - Alkhazov, G.

AU - Cartelle, P. Alvarez

AU - Alves, A. A.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Archilli, F.

AU - Romeu, J. Arnau

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Back, J. J.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Baranov, A.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Batozskaya, V.

AU - Batsukh, B.

AU - Battig, A.

AU - Battista, V.

AU - Bay, A.

AU - Bedeschi, F.

AU - Bediaga, I.

AU - Fleuret, F.

AU - Maurice, E.

PY - 2020/3/27

Y1 - 2020/3/27

N2 - The ratio of the Bs0 and B+ fragmentation fractions fs and fu is studied with Bs0→J/ψφ and B+→J/ψK+ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV center-of-mass energies. The analysis is performed in bins of B-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity, and rapidity. The fragmentation-fraction ratio fs/fu is observed to depend on the B-meson transverse momentum with a significance of 6.0σ. This dependency is driven by the 13 TeV sample (8.7σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8σ evidence for an increase of fs/fu as a function of collision energy.

AB - The ratio of the Bs0 and B+ fragmentation fractions fs and fu is studied with Bs0→J/ψφ and B+→J/ψK+ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV center-of-mass energies. The analysis is performed in bins of B-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity, and rapidity. The fragmentation-fraction ratio fs/fu is observed to depend on the B-meson transverse momentum with a significance of 6.0σ. This dependency is driven by the 13 TeV sample (8.7σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8σ evidence for an increase of fs/fu as a function of collision energy.

U2 - 10.1103/PhysRevLett.124.122002

DO - 10.1103/PhysRevLett.124.122002

M3 - Article

C2 - 32281875

AN - SCOPUS:85083546097

SN - 0031-9007

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

IS - 12

M1 - 122002

ER -

Measurement of fs /fu Variation with Proton-Proton Collision Energy and B -Meson Kinematics

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