Measurement of properties of Bs0 to mu+mu- decays and search for B0 to mu+mu- with the CMS experiment - INSPIRE

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Measurement of properties of Bs0 to mu+mu- decays and search for B0 to mu+mu- with the CMS experiment

CMS

Collaboration

2019

25 pages

Published: 2019

Report number:

CMS-PAS-BPH-16-004,
CMS-PAS-BPH-16-004

Experiments:

CERN-LHC-CMS,
CERN-LHC-CMS

View in:

CERN Document Server

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Abstract: (CDS)

Results are reported for the

{\rm B_s^0}\to\mu^+\mu^-

branching fraction and effective lifetime and from a search for the decay

{\rm B^0}\to\mu^+\mu^-

. The analysis uses a data sample of proton-proton collisions accumulated by the CMS experiment in 2011, 2012, and 2016, with center-of-mass energies (integrated luminosities) of 7 TeV (5 fb

^{-1}

), 8 TeV (20 fb

^{-1}

), and 13 TeV (36 fb

^{-1}

). The branching fractions are determined by measuring efficiency-corrected event yields relative to

{\rm B^+}\to{\rm J}/\psi {\rm K^+}

decays (with

{\rm J}/\psi\to\mu^+\mu^-

), which results in the cancellation of many of the systematic uncertainties. The decay

{\rm B_s^0}\to\mu^+\mu^-

is observed with a branching fraction of

{\cal B}({\rm B_s^0}\to\mu^+\mu^-) = {[2.9^{+0.7}_{-0.6}\,(\text{exp})\pm{0.2}\,(\text{frag})]\times10^{-9}}

, where frag refers to the uncertainty in the ratio

f_s/f_u

of the

{\rm B_s^0}

and the

{\rm B^+}

fragmentation functions, corresponding to a significance of 5.6 standard deviations. No significant excess is observed for the decay

{\rm B^0}\to\mu^+\mu^-

, and the upper limit

{\cal B}({\rm B^0}\to\mu^+\mu^-) < {3.6\times10^{-10}}

is obtained at

95\%

confidence level. These measured branching fractions are consistent with standard model predictions, and they supersede previous results from CMS based on the 2011 and 2012 data only. Finally, the

{\rm B_s^0}\to\mu^+\mu^-

effective lifetime is measured, for the first time in CMS, and is found to be

\tau_{\mu^+\mu^-} = {1.70^{+0.61}_{-0.44}}

ps.

Note:

Preliminary results •
Preliminary results

Monte-Carlo
p p: colliding beams
B/s0: leptonic decay
B0: leptonic decay
B/s0: rare decay
B0: rare decay
muon: pair production
B/s0: branching ratio: measured
B0: branching ratio: upper limit
B/s0: lifetime

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