Aaij, R. et al. (2013) First Evidence for the Decay B_{s}^{0}→μ^{+}μ^{-}. Physical Review Letters, 110 (2). ISSN 0031-9007
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Abstract
A search for the rare decays Bs0→μ+μ- and B0→μ+μ- is performed with data collected in 2011 and 2012 with the LHCb experiment at the Large Hadron Collider. The data samples comprise 1.1 fb-1 of proton-proton collisions at √s=8 TeV and 1.0 fb-1 at √s=7 TeV. We observe an excess of Bs0→μ+μ- candidates with respect to the background expectation. The probability that the background could produce such an excess or larger is 5.3×10-4 corresponding to a signal significance of 3.5 standard deviations. A maximum-likelihood fit gives a branching fraction of B(Bs0→μ+μ-)=(3.2-1.2+1.5)×10-9, where the statistical uncertainty is 95% of the total uncertainty. This result is in agreement with the standard model expectation. The observed number of B0→μ+μ- candidates is consistent with the background expectation, giving an upper limit of B(B0→μ+μ-)<9.4×10-10 at 95% confidence level.
Item Type: | Article |
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Subjects: | Q Science > QC Physics |
Schools: | School of Applied Sciences |
Related URLs: | |
Depositing User: | Roger Barlow |
Date Deposited: | 29 Jul 2013 09:35 |
Last Modified: | 28 Aug 2021 19:50 |
URI: | http://eprints.hud.ac.uk/id/eprint/18005 |
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