A search for the rare decays B0s→μ+μ− and B0→μ+μ− is performed at the LHCb experiment. The data analyzed correspond to an integrated luminosity of 1  fb−1 of pp collisions at a center-of-mass energy of 7 TeV and 2  fb−1 at 8 TeV. An excess of B0s→μ+μ− signal candidates with respect to the background expectation is seen with a significance of 4.0 standard deviations. A time-integrated branching fraction of ℬ(B0s→μ+μ−)=(2.9+1.1−1.0)×10−9 is obtained and an upper limit of ℬ(B0→μ+μ−)<7.4×10−10 at 95% confidence level is set. These results are consistent with the standard model expectations.

Measurement of the B-s(0) -> mu(+)mu(-) Branching Fraction and Search for B-0 -> mu(+)mu(-) Decays at the LHCb Experiment

CARDINALE, ROBERTA;FONTANELLI, FLAVIO;PATRIGNANI, CLAUDIA;PETROLINI, ALESSANDRO;
2013-01-01

Abstract

A search for the rare decays B0s→μ+μ− and B0→μ+μ− is performed at the LHCb experiment. The data analyzed correspond to an integrated luminosity of 1  fb−1 of pp collisions at a center-of-mass energy of 7 TeV and 2  fb−1 at 8 TeV. An excess of B0s→μ+μ− signal candidates with respect to the background expectation is seen with a significance of 4.0 standard deviations. A time-integrated branching fraction of ℬ(B0s→μ+μ−)=(2.9+1.1−1.0)×10−9 is obtained and an upper limit of ℬ(B0→μ+μ−)<7.4×10−10 at 95% confidence level is set. These results are consistent with the standard model expectations.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/696032
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