A search has been performed for Bs0->mu+mu- and B0->mu+mu- decays using 7fb-1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. The observed number of B0 candidates is consistent with background-only expectations and yields an upper limit on the branching fraction of B(B0->mu+mu-)<6.0x10^-9 at 95% confidence level. We observe an excess of Bs0 candidates. The probability that the background processes alone could produce such an excess or larger is 0.27%. The probability that the combination of background and the expected standard model rate ofBs0->mu+mu- could produce such an excess or larger is 1.9%. These data are used to determine B(Bs0->mu+mu-)=(1.8[-0.9+1.1])×10^-8 and provide an upper limit of B(Bs0->mu+mu-)<4.0×10^-8 at 95% confidence level.

T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2011). Search for B_{s}^{0}→μ^{+}μ^{-} and B^{0}→μ^{+}μ^{-} Decays with CDF II. PHYSICAL REVIEW LETTERS, 107(19), 191801-1-191801-7 [10.1103/PhysRevLett.107.191801].

Search for B_{s}^{0}→μ^{+}μ^{-} and B^{0}→μ^{+}μ^{-} Decays with CDF II

BARRIA, PATRIZIA;GAROSI, PAOLA;RUFFINI, FABRIZIO;SCRIBANO, ANGELO;
2011

Abstract

A search has been performed for Bs0->mu+mu- and B0->mu+mu- decays using 7fb-1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. The observed number of B0 candidates is consistent with background-only expectations and yields an upper limit on the branching fraction of B(B0->mu+mu-)<6.0x10^-9 at 95% confidence level. We observe an excess of Bs0 candidates. The probability that the background processes alone could produce such an excess or larger is 0.27%. The probability that the combination of background and the expected standard model rate ofBs0->mu+mu- could produce such an excess or larger is 1.9%. These data are used to determine B(Bs0->mu+mu-)=(1.8[-0.9+1.1])×10^-8 and provide an upper limit of B(Bs0->mu+mu-)<4.0×10^-8 at 95% confidence level.
T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2011). Search for B_{s}^{0}→μ^{+}μ^{-} and B^{0}→μ^{+}μ^{-} Decays with CDF II. PHYSICAL REVIEW LETTERS, 107(19), 191801-1-191801-7 [10.1103/PhysRevLett.107.191801].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/48446
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