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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

Journal Article · · Nature (London)
DOI:https://doi.org/10.1038/nature14474· OSTI ID:1234865
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.

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.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
CMS Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1234865
Report Number(s):
FERMILAB-PUB-14-489-CMS; CERN-PH-EP-2014-220; CMS-BPH-13-007; arXiv eprint number arXiv:1411.4413; TRN: US1600714
Journal Information:
Nature (London), Vol. 522, Issue 7554; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 117 works
Citation information provided by
Web of Science

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