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Title: Observation of the rare $$B^0_s\to\mu^+\mu^-$$ decay from the combined analysis of CMS and LHCb data

Abstract

The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. We foudn that the probabilities, or branching fractions, of the strange B meson (B 02 ) and the B0 meson decaying into two oppositely charged muons (μ+ and μ-) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B 02 → μ+ and μ- and (B 0 → μ+ and μ- decays are very rare, with about four of the former occurring for every billion mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (Compact Muon Solenoid) and LHCb (Large Hadron Collider beauty) collaborations have performed amore » joint analysis of the data from proton–proton collisions that they collected in 2011 at a centre-of-mass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the μ+ and μ-decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. We then obtained evidence for the B 0 → μ+ and μ- decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standard model. The LHC experiments will resume taking data in 2015, recording proton–proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of B 02 and B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.« less

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1234865
Report Number(s):
FERMILAB-PUB-14-489-CMS; CERN-PH-EP-2014-220; CMS-BPH-13-007
Journal ID: ISSN 0028-0836; arXiv eprint number arXiv:1411.4413; TRN: US1600714
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Nature (London)
Additional Journal Information:
Journal Name: Nature (London); Journal Volume: 522; Journal Issue: 7554; Journal ID: ISSN 0028-0836
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; experimental particle physics

Citation Formats

Khachatryan, Vardan. Observation of the rare $B^0_s\to\mu^+\mu^-$ decay from the combined analysis of CMS and LHCb data. United States: N. p., 2015. Web. doi:10.1038/nature14474.
Khachatryan, Vardan. Observation of the rare $B^0_s\to\mu^+\mu^-$ decay from the combined analysis of CMS and LHCb data. United States. https://doi.org/10.1038/nature14474
Khachatryan, Vardan. Wed . "Observation of the rare $B^0_s\to\mu^+\mu^-$ decay from the combined analysis of CMS and LHCb data". United States. https://doi.org/10.1038/nature14474. https://www.osti.gov/servlets/purl/1234865.
@article{osti_1234865,
title = {Observation of the rare $B^0_s\to\mu^+\mu^-$ decay from the combined analysis of CMS and LHCb data},
author = {Khachatryan, Vardan},
abstractNote = {The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. We foudn that the probabilities, or branching fractions, of the strange B meson (B 02 ) and the B0 meson decaying into two oppositely charged muons (μ+ and μ-) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B 02 → μ+ and μ- and (B 0 → μ+ and μ- decays are very rare, with about four of the former occurring for every billion mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (Compact Muon Solenoid) and LHCb (Large Hadron Collider beauty) collaborations have performed a joint analysis of the data from proton–proton collisions that they collected in 2011 at a centre-of-mass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the μ+ and μ-decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. We then obtained evidence for the B 0 → μ+ and μ- decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standard model. The LHC experiments will resume taking data in 2015, recording proton–proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of B 02 and B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.},
doi = {10.1038/nature14474},
journal = {Nature (London)},
number = 7554,
volume = 522,
place = {United States},
year = {Wed May 13 00:00:00 EDT 2015},
month = {Wed May 13 00:00:00 EDT 2015}
}

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Simplified dark matter models with two Higgs doublets: I. Pseudoscalar mediators
text, January 2017

  • Bauer, Martin; Haisch, Ulrich; Kahlhoefer, Felix
  • Deutsches Elektronen-Synchrotron, DESY, Hamburg
  • DOI: 10.3204/pubdb-2017-05984

FlavBit: a GAMBIT module for computing flavour observables and likelihoods
text, January 2017

  • Bernlochner, Florian U.; Chrząszcz, Marcin; Dal, Lars A.
  • Springer
  • DOI: 10.5167/uzh-148659

Likelihood analysis of supersymmetric SU(5) GUTs
text, January 2017


GAMBIT: the global and modular beyond-the-standard-model inference tool
journal, November 2017


FlavBit: A GAMBIT module for computing flavour observables and likelihoods
text, January 2017


Global fits of GUT-scale SUSY models with GAMBIT
text, January 2017


Invisible decay of the Higgs boson in the context of a thermal and nonthermal relic in MSSM
journal, May 2017

  • Barman, Rahool Kumar; Bélanger, Genevieve; Bhattacherjee, Biplob
  • Physical Review D, Vol. 95, Issue 9
  • DOI: 10.1103/physrevd.95.095018

Correlation between the decays h0 → γγ/gg in the MSSM with quark flavor violation
journal, August 2019

  • Eberl, H.; Hidaka, K.; Ginina, E.
  • International Journal of Modern Physics A, Vol. 34, Issue 22
  • DOI: 10.1142/s0217751x19501203

Rare B-meson decays at the crossroads
journal, August 2016


Naturalising the third family hypercharge model for neutral current $$B{-}\hbox {anomalies}$$B-anomalies
journal, November 2019


Global fits of GUT-scale SUSY models with GAMBIT
text, January 2017


Search for supersymmetry at the LHC
journal, January 2004


Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2
journal, February 2019


Update of the global electroweak fit and constraints on two-Higgs-doublet models
text, January 2018


Likelihood analysis of supersymmetric SU(5) GUTs
text, January 2017

  • Bagnaschi, E.; Costa, J. C.; Sakurai, K.
  • Deutsches Elektronen-Synchrotron, DESY, Hamburg
  • DOI: 10.3204/pubdb-2017-01137

Hybrid anomaly and gravity mediation for electroweak supersymmetry
journal, March 2018

  • Zhu, Bin; Ding, Ran; Li, Tianjun
  • International Journal of Modern Physics A, Vol. 33, Issue 07
  • DOI: 10.1142/s0217751x18500355

Global fits of GUT-scale SUSY models with GAMBIT
journal, December 2017


Probing new physics through B s * μ + μ decay
journal, February 2018


Rare B -Meson Decays at the Crossroads
conference, December 2016


CP violation in the B system
journal, February 2017


Some results on lepton flavour universality violation
journal, July 2019


UsingΛb→Λμ+μ−data within a Bayesian analysis of|ΔB|=|ΔS|=1decays
text, January 2016


Likelihood analysis of the sub-GUT MSSM in light of LHC 13-TeV data
journal, February 2018


The CMS trigger system
text, January 2017


FLAG Review 2019: Flavour Lattice Averaging Group (FLAG)
journal, February 2020


High scale flavor alignment in two-Higgs doublet models and its phenomenology
text, January 2017


Pseudoscalar mediators: a WIMP model at the neutrino floor
journal, March 2018

  • Arcadi, Giorgio; Lindner, Manfred; Queiroz, Farinaldo S.
  • Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 03
  • DOI: 10.1088/1475-7516/2018/03/042

Review of lattice results concerning low-energy particle physics
text, January 2017


Rare B-meson decays at the crossroads
text, January 2016


GAMBIT: the global and modular beyond-the-standard-model inference tool: Addendum for GAMBIT 1.1: Mathematica backends, SUSYHD interface and updated likelihoods
journal, February 2018


Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016
journal, December 2017


SCYNet: Testing supersymmetric models at the LHC with neural networks
text, January 2017


Subnuclear Physics
book, November 2017


Constraints on tensor and scalar couplings from $$B\rightarrow K\bar{\mu }\mu $$ B → K μ ¯ μ and $$B_s\rightarrow \bar{\mu }\mu $$ B s → μ ¯ μ
journal, September 2015


Lepton flavor violation in exclusive $$b\rightarrow s$$ b → s decays
journal, March 2016

  • Bečirević, Damir; Sumensari, Olcyr; Funchal, Renata Zukanovich
  • The European Physical Journal C, Vol. 76, Issue 3
  • DOI: 10.1140/epjc/s10052-016-3985-0

Neutral B-meson mixing from full lattice QCD at the physical point
text, January 2019

  • Dowdall, Rj; Davies, Cth; Horgan, Ronald
  • Apollo - University of Cambridge Repository
  • DOI: 10.17863/cam.45801

Update of the global electroweak fit and constraints on two-Higgs-doublet models
journal, August 2018


Search for Supersymmetry at the LHC
text, January 2017


Flavorful Two Higgs Doublet Models with a Twist
text, January 2018


Review of lattice results concerning low-energy particle physics: Flavour Lattice Averaging Group (FLAG)
journal, February 2017


Hybrid Anomaly and Gravity Mediation for Electroweak Supersymmetry
text, January 2017


Living without supersymmetry—the conformal alternative and a dynamical Higgs boson
journal, October 2017

  • Mannheim, Philip D.
  • Journal of Physics G: Nuclear and Particle Physics, Vol. 44, Issue 11
  • DOI: 10.1088/1361-6471/aa888e

Physics paper sets record with more than 5,000 authors
journal, May 2015


Update of the flavour-physics constraints in the NMSSM
journal, August 2016


Simplified dark matter models with two Higgs doublets: I. Pseudoscalar mediators
text, January 2017

  • Bauer, Martin; Haisch, Ulrich; Kahlhoefer, Felix
  • Deutsches Elektronen-Synchrotron, DESY, Hamburg
  • DOI: 10.3204/pubdb-2017-00821

Study of the rare decays ${B}_{s,d}^{* } \rightarrow {\mu }^{+}{\mu }^{-}$
journal, February 2017

  • Sahoo, Suchismita; Mohanta, Rukmani
  • Journal of Physics G: Nuclear and Particle Physics, Vol. 44, Issue 3
  • DOI: 10.1088/1361-6471/aa577e

Angular analysis of the $B^{0} o K^{*0} \mu^{+} \mu^{-}$ decay using 3 fb$^{-1}$ of integrated luminosity
text, January 2015


FLAG Review 2019
text, January 2019


The BSM-AI project: SUSY-AI–generalizing LHC limits on supersymmetry with machine learning
journal, April 2017


The design of the MEG II experiment: MEG II Collaboration
journal, May 2018


FlavBit: a GAMBIT module for computing flavour observables and likelihoods
journal, November 2017


Investigating the 331-Z′ mediated FCNC effects on b → sμ+μ− transitions
journal, July 2018

  • Singh, Soram Robertson; Mawlong, Barilang; D’cruz, Ritu
  • International Journal of Modern Physics A, Vol. 33, Issue 21
  • DOI: 10.1142/s0217751x18501257

Gauging the accidental symmetries of the standard model, and implications for the flavor anomalies
text, January 2020

  • Altmannshofer, Wolfgang; Davighi, Joseph; Nardecchia, Marco
  • Apollo - University of Cambridge Repository
  • DOI: 10.17863/cam.48521

CP violation in leptonic rare $$B^0_s$$Bs0 decays as a probe of new physics
journal, December 2017

  • Fleischer, Robert; Espinosa, Daniela Galárraga; Jaarsma, Ruben
  • The European Physical Journal C, Vol. 78, Issue 1
  • DOI: 10.1140/epjc/s10052-017-5488-z

Some results on Lepton Flavour Universality Violation
text, January 2018


Measurement of b hadron fractions in 13 TeV pp collisions
text, January 2019

  • Collaboration, LHCb; Bernet, Roland; Müller, Katharina
  • American Physical Society
  • DOI: 10.5167/uzh-180440

GAMBIT: the global and modular beyond-the-standard-model inference tool
text, January 2017

  • Athron, Peter; Balazs, Csaba; Bringmann, Torsten
  • Deutsches Elektronen-Synchrotron, DESY, Hamburg
  • DOI: 10.3204/pubdb-2018-00527

Precision tests of the Standard Model: Rare B -meson decays
text, January 2017


Precision tests of the Standard Model: Rare B -meson decays
journal, March 2017


Future flavour physics experiments
journal, December 2015