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.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.