CERN Accelerating science

Published Articles
Report number	ATL-PHYS-PROC-2016-064 ; 2155542
Title	Study Of The Rare Decays Of $B^0_s$ And $B^0$ Into Muon Pairs With The ATLAS Detector
Author(s)	Palestini, Sandro (CERN)
Collaboration	ATLAS
Publication	ARISF, 2016
Number of pages	6
In:	51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 12 - 19 Mar 2016, pp.59-64
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	on behalf of the ATLAS Collaboration A study of the decays $B^0$s → $μ^+ μ^−$ and $B^0$ → $μ^+ μ^−$ has been performed using data corresponding to an integrated luminosity of 25 fb −1 of 7 TeV and 8 TeV proton–proton collisions collected with the ATLAS detector during the LHC Run 1. For B 0 , an upper limit on the branching fraction is set at B($B^0 → μ^+ μ^−$) < 4.2 × 10 −10 at 95% confidence level. For $B^0_s$ , the branching fraction B($B^0 → μ^+ μ^−$) = $0.9^{+1.1}_{−0.8}$ × $10^{−9}$ is measured. The results are consistent with the Standard Model prediction with a p-value of 4.8%, corresponding to 2.0 standard deviations.

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