Measurement of the B0s → μ+μ- Branching Fraction and Search for B0 → μ+μ- with the CMS Experiment

CMS Collaboration

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Abstract

Results are presented from a search for the rare decays B0s → μ+μ- and B0 → μ+μ- in pp collisions at √s = 7 and 8 TeV, with data samples corresponding to integrated luminosities of 5 and 20 fb-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(B0s → μ+μ-) = (3.0+1.0-0.9) x 10-9, where the uncertainty includes both statistical and systematic contributions. An excess of B0s → μ+μ- events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B0 → μ+μ- an upper limit of B(B0 → μ+μ- ) < 1.1 x 10-9 at the 95% confidence level is determined. Both results are in agreement with the expectations from the standard model.
Original languageEnglish
Article number101804
Number of pages17
JournalPhysical Review Letters
Volume111
Issue number10
DOIs
Publication statusPublished - 2013
Externally publishedYes

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