Measurement of the B[0 over s] → μ[superscript +]μ[superscript -] Branching Fraction and Search for B[superscript 0] → μ[superscript +]μ[superscript -] with the CMS Experiment
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Chatrchyan-2013-Measurement of the B.pdf
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Author(s)
Apyan, Aram
Busza, Wit
Cali, Ivan Amos
Chan, M.
Di Matteo, Leonardo
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Kim, Y.
Klute, Markus
Date Issued
September 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Measurement of the B[0 over s] → μ[superscript +]μ[superscript -] Branching Fraction and Search for B[superscript 0] → μ[superscript +]μ[superscript -] with the CMS Experiment.” Physical Review Letters 111, no. 10 (September 2013). © 2013 CERN, for the CMS Collaboration
Version
Final published version
Abstract
Results are presented from a search for the rare decays B[0 over s] → μ[superscript +]μ[superscript -] and B[superscript 0] → μ[superscript +]μ[superscript -] in pp collisions at √s = 7 and 8 TeV, with data samples corresponding to integrated luminosities of 5 and 20 fb[superscript −1], respectively, collected by the CMS experiment at the LHC. An unbinned maximum-likelihood fit to the dimuon invariant mass distribution gives a branching fraction B(B[0 over s] → μ[superscript +]μ[superscript -]) = (3.0[+1.0 over −0.9]) × 10[superscript −9], where the uncertainty includes both statistical and systematic contributions. An excess of B[0 over s] → μ[superscript +]μ[superscript -] events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B[superscript 0] → μ[superscript +]μ[superscript -] an upper limit of B(B[superscript 0] → μ[superscript +]μ[superscript -]) < 1.1 × 10[superscript −9] at the 95% confidence level is determined. Both results are in agreement with the expectations from the standard model.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.101804
