CERN Accelerating science

LHCb Note
Report number	arXiv:1705.03274 ; LHCB-PROC-2017-014 ; CERN-LHCB-PROC-2017-014 ; LHCb-PROC-2017-014; CERN-LHCb-PROC-2017-014 ; CERN-LHCb-PROC-2017-014
Title	The branching fraction and effective lifetime of $B_{(s)}^{0} \rightarrow \mu^+ \mu^-$ at LHCb with Run 1 and Run 2 data
Author(s)	Mulder, Mick (NIKHEF, Amsterdam)
Collaboration	LHCb Collaboration
Note	4 pages, 2 figures, Moriond 2017 EW Session
Submitted to	52nd Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 18 - 25 Mar 2017, pp.469-472
Submitted by	[email protected] on 08 May 2017
Subject category	Particle Physics - Experiment ; hep-ex
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	After Run 1 of the LHC, global fits to $b \rightarrow s \ell \ell$ observables show a deviation from the Standard Model (SM) with a significance of $\sim$ 4 standard devations. An example of a $b \rightarrow s \ell \ell$ process is the decay of a $B_{s}^0$ meson into two muons ($B_{s}^0 \rightarrow \mu^+ \mu^-$). The latest analysis of $B_{(s)}^0 \rightarrow \mu^+ \mu^-$ decays by LHCb with Run 1 and Run 2 data is presented. The $B_{s}^0 \rightarrow \mu^+ \mu^-$ decay is observed for the first time by a single experiment. In addition, the first measurement of the $B_{s}^0 \rightarrow \mu^+ \mu^-$ effective lifetime is performed. No significant excess of $B^0 \rightarrow \mu^+ \mu^-$ decays is observed. All results are consistent with the SM and constrain New Physics in $b \rightarrow s \ell \ell$ processes.
Copyright/License	arXiv nonexclusive-distrib. 1.0 Preprint: (License: CC-BY-4.0)

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