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New results on the search for $B^0_s\rightarrow \mu^+\mu^-$ from LHCb

Authors
  • Albrecht, Johannes
Type
Preprint
Publication Date
Feb 06, 2013
Submission Date
Feb 06, 2013
Identifiers
DOI: 10.1051/epjconf/20134903003
Source
arXiv
License
Yellow
External links

Abstract

A search for the rare decays $B^0_s\rightarrow \mu^+\mu^-$ and $B^0\rightarrow \mu^+\mu^-$ is performed with the LHCb experiment using 1.1\,fb$^{-1}$ of data collected at $\sqrt s=8$\,TeV$ and 1.0\,fb$^{-1}$ of data collected at $\sqrt s=7$\,TeV. An excess of $B^0_s\rightarrow \mu^+\mu^-$ candidates with respect to the background expectations is observed with a statistical significance of 3.5 standard deviations. A branching fraction of ${\cal BR}(B^0_s\rightarrow \mu^+\mu^-) =(3.2^{+1.5}_{-1.2}) \times 10^{-9}$ is measured with an unbinned maximum likelihood fit. The measured branching fraction is in agreement with the expectation from the Standard Model. The observed number of $B^0\rightarrow \mu^+\mu^-$ candidates is consistent with the background expectation and an upper limit on the branching fraction of ${\cal BR}(B^0\rightarrow \mu^+\mu^-) < 9.4\times10^{-10}$ is obtained.

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