Measurement of the $B^0_s\to\mu^+\mu^-$ branching fraction and effective lifetime and search for $B^0\to\mu^+\mu^-$ decays - INSPIRE

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Measurement of the $B^0_s\to\mu^+\mu^-$ branching fraction and effective lifetime and search for $B^0\to\mu^+\mu^-$ decays

LHCb

Collaboration

Mar 16, 2017

11 pages

Published in:

Phys.Rev.Lett. 118 (2017) 19, 191801

Published: May 11, 2017

e-Print:

1703.05747 [hep-ex]

DOI:

10.1103/PhysRevLett.118.191801

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}

Report number:

CERN-EP-2017-041,
LHCB-PAPER-2017-001

Experiments:

CERN-LHC-LHCb

View in:

reference search441 citations

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Abstract: (APS)

A search for the rare decays Bs0→μ+μ- and B0→μ+μ- is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb-1. An excess of Bs0→μ+μ- decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(Bs0→μ+μ-)=(3.0±0.6-0.2+0.3)×10-9, where the first uncertainty is statistical and the second systematic. The first measurement of the Bs0→μ+μ- effective lifetime, τ(Bs0→μ+μ-)=2.04±0.44±0.05 ps, is reported. No significant excess of B0→μ+μ- decays is found, and a 95% confidence level upper limit, B(B0→μ+μ-)<3.4×10-10, is determined. All results are in agreement with the standard model expectations.

Note:

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-001.html

p p: colliding beams
B/s0: hadroproduction
B0: hadroproduction
B/s0: leptonic decay
B/s0: rare decay
B0: leptonic decay
B0: rare decay
muon: pair production
B/s0: branching ratio: measured
B0: branching ratio: upper limit

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Figures(4)

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