Search for the rare decays Bs -> mu+ mu- and B0 -> mu+ mu-
LHCb Collaboration: R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi,, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander,, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr, S. Amato, Y. Amhis, J., Anderson, R. B. Appleby, O. Aquines Gutierrez
TL;DR
This paper reports a search for rare Bs and B0 meson decays into muon pairs using LHCb data, setting new upper limits on their branching fractions at 95% confidence level.
Contribution
The study provides the most stringent upper limits to date on the branching fractions of Bs and B0 decays into muon pairs, combining 2010 and 2011 datasets.
Findings
Upper limit on BR(Bs -> mu+ mu-) < 1.4 x 10^-8
Upper limit on BR(B0 -> mu+ mu-) < 3.2 x 10^-9
No evidence of these rare decays was observed
Abstract
A search for the decays Bs -> mu+ mu- and B0 -> mu+ mu- is performed with 0.37 fb^-1 of pp collisions at sqrt{s} = 7 TeV collected by the LHCb experiment in 2011. The upper limits on the branching fractions are BR (Bs -> mu+ mu-) < 1.6 x 10^-8 and BR(B0 -> mu+ mu-) < 3.6 x 10^-9 at 95% confidence level. A combination of these results with the LHCb limits obtained with the 2010 dataset leads to BR (Bs -> mu+ mu-) < 1.4 x 10^-8 and BR (B0 -> mu+ mu-) < 3.2 x 10^-9 at 95% confidence level.
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