Measurement of the Bs0 →μ+μ- Branching Fraction and Effective Lifetime and Search for B0 →μ+μ- Decays

(LHCb Collaboration)

doi:10.1103/PhysRevLett.118.191801

Measurement of the Bs0 →μ+μ- Branching Fraction and Effective Lifetime and Search for B0 →μ+μ- Decays

(LHCb Collaboration)

European Organization for Nuclear Research
University Santiago de Compostela
University of Bristol
Clermont-Auvergne University
University of Cincinnati
University of Dortmund
University of Glasgow
Science Park 105
Petersburg Nuclear Physics Institute (PNPI)
Imperial College London
Instituto de Biofisica da UFRJ
INFN
Laboratoire de l'Accélérateur Linéaire
Tsinghua University
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
ENAC-IIC-GEL
Sezione INFN di Ferrara
University of Ferrara
University of Maryland, College Park
University of Manchester
University of Heidelberg
Aix-Marseille Université
Kurchatov Institute
Syracuse University
Sezione di Roma
University of Warwick
University of Barcelona
Pontifícia Universidade Católica do Rio de Janeiro
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Yandex School of Data Analysis
Institute for Theoretical and Experimental Physics
Institute for Nuclear Physics
Agh University of Science and Technology Faculty of Computer Science
National Centre for Nuclear Research (NCBJ)
Université Savoie Mont Blanc
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Centro Brasileiro de Pesquisas Fisicas
INFN Sezione di Milano-Bicocca
University of Milano-Bicocca
Universités Paris VI and VII
LNF-INFN
RWTH Aachen University
Moscow State University
University of Zurich
INFN Sezione di Bologna
University of Birmingham
University of Modena and Reggio Emilia
Max-Planck-Institut für Kernphysik
Massachusetts Institute of Technology
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Sezione INFN di Cagliari
University of Liverpool
Universitat Ramon LLull - CSIC
University of Bologna
University of Rome “Tor Vergata”
Sezione di Genova
University of Genoa
University of Edinburgh
Scuola Normale Superiore di Pisa
University of Oxford
University of Cambridge
Universitá di Cagliari
Horia Hulubei National Institute of Physics and Nuclear Engineering
INFN Sezione di Bari
Università degli studi di Bari Aldo Moro
Sezione INFN di Milano
Kharkov Institute of Physics and Technology
CCLRC Rutherford Appleton Laboratory
Institute for Nuclear Research of the Russian Academy of Sciences
University of Milano
University of Valencia
Universidade Federal Do Triângulo Mineiro (UFTM)
Universität Rostock
University of Chinese Academy of Sciences
Vrije Universiteit Amsterdam
Institute of Nuclear Research, National Academy of Sciences in Ukraine
Kurchatov Institute
University of Padova
Iligan Institute of Technology (IIT)
University College Dublin
Universidad Nacional de Colombia
Hanoi University of Science
ICS/University of Groningen
University of Pisa
University of Rome
Università degli Studi della Basilicata
Wuhan University
University of Urbino Carlo Bo
Central China Normal University

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

Abstract

A search for the rare decays Bs0→μ+μ- and B0→μ+μ- is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb-1. An excess of Bs0→μ+μ- decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(Bs0→μ+μ-)=(3.0±0.6-0.2+0.3)×10-9, where the first uncertainty is statistical and the second systematic. The first measurement of the Bs0→μ+μ- effective lifetime, τ(Bs0→μ+μ-)=2.04±0.44±0.05 ps, is reported. No significant excess of B0→μ+μ- decays is found, and a 95% confidence level upper limit, B(B0→μ+μ-)<3.4×10-10, is determined. All results are in agreement with the standard model expectations.

Original language	English
Article number	191801
Journal	Physical Review Letters
Volume	118
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.118.191801
Publication status	Published - 11 May 2017

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10.1103/PhysRevLett.118.191801

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@article{9abc3b2eba7840a7895a9d862cef8578,

title = "Measurement of the Bs0 →μ+μ- Branching Fraction and Effective Lifetime and Search for B0 →μ+μ- Decays",

abstract = "A search for the rare decays Bs0→μ+μ- and B0→μ+μ- is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb-1. An excess of Bs0→μ+μ- decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(Bs0→μ+μ-)=(3.0±0.6-0.2+0.3)×10-9, where the first uncertainty is statistical and the second systematic. The first measurement of the Bs0→μ+μ- effective lifetime, τ(Bs0→μ+μ-)=2.04±0.44±0.05 ps, is reported. No significant excess of B0→μ+μ- decays is found, and a 95\% confidence level upper limit, B(B0→μ+μ-)<3.4×10-10, is determined. All results are in agreement with the standard model expectations.",

author = "\{(LHCb Collaboration)\} and R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and \{Alvarez Cartelle\}, P. and Alves, \{A. A.\} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, \{J. E.\} and Appleby, \{R. B.\} and F. Archilli and P. D'Argent and \{Arnau Romeu\}, J. and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and I. Babuschkin and S. Bachmann and Back, \{J. J.\} and A. Badalov and C. Baesso and S. Baker and V. Balagura and W. Baldini and A. Baranov and Barlow, \{R. J.\} and C. Barschel and S. Barsuk and W. Barter and F. Baryshnikov and M. Baszczyk and V. Batozskaya and B. Batsukh and V. Battista and A. Bay and F. Fleuret and E. Maurice",

note = "Publisher Copyright: {\textcopyright} 2017 CERN, for the LHCb Collaboration. Published by the American Physical Society under the terms of the «https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.",

year = "2017",

month = may,

day = "11",

doi = "10.1103/PhysRevLett.118.191801",

language = "English",

volume = "118",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "19",

}

TY - JOUR

T1 - Measurement of the Bs0 →μ+μ- Branching Fraction and Effective Lifetime and Search for B0 →μ+μ- Decays

AU - (LHCb Collaboration)

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - D'Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Babuschkin, I.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Baranov, A.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Baryshnikov, F.

AU - Baszczyk, M.

AU - Batozskaya, V.

AU - Batsukh, B.

AU - Battista, V.

AU - Bay, A.

AU - Fleuret, F.

AU - Maurice, E.

N1 - Publisher Copyright: © 2017 CERN, for the LHCb Collaboration. Published by the American Physical Society under the terms of the «https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2017/5/11

Y1 - 2017/5/11

N2 - A search for the rare decays Bs0→μ+μ- and B0→μ+μ- is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb-1. An excess of Bs0→μ+μ- decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(Bs0→μ+μ-)=(3.0±0.6-0.2+0.3)×10-9, where the first uncertainty is statistical and the second systematic. The first measurement of the Bs0→μ+μ- effective lifetime, τ(Bs0→μ+μ-)=2.04±0.44±0.05 ps, is reported. No significant excess of B0→μ+μ- decays is found, and a 95% confidence level upper limit, B(B0→μ+μ-)<3.4×10-10, is determined. All results are in agreement with the standard model expectations.

AB - A search for the rare decays Bs0→μ+μ- and B0→μ+μ- is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb-1. An excess of Bs0→μ+μ- decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(Bs0→μ+μ-)=(3.0±0.6-0.2+0.3)×10-9, where the first uncertainty is statistical and the second systematic. The first measurement of the Bs0→μ+μ- effective lifetime, τ(Bs0→μ+μ-)=2.04±0.44±0.05 ps, is reported. No significant excess of B0→μ+μ- decays is found, and a 95% confidence level upper limit, B(B0→μ+μ-)<3.4×10-10, is determined. All results are in agreement with the standard model expectations.

U2 - 10.1103/PhysRevLett.118.191801

DO - 10.1103/PhysRevLett.118.191801

M3 - Article

C2 - 28548525

AN - SCOPUS:85019565744

SN - 0031-9007

VL - 118

JO - Physical Review Letters

JF - Physical Review Letters

IS - 19

M1 - 191801

ER -

Measurement of the Bs0 →μ+μ- Branching Fraction and Effective Lifetime and Search for B0 →μ+μ- Decays

Abstract

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