A search has been performed for B-s(0) --> mu(+)mu(-) and B-0 --> mu(+)mu(-) decays using 7 fb(-1) of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. The observed number of B-0 candidates is consistent with background- only expectations and yields an upper limit on the branching fraction of B(B-0 --> mu(+)mu(-)) < 6.0 X 10(-9) at 95% confidence level. We observe an excess of B-s(0) 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 of B-s(0) --> mu(+)mu(-) could produce such an excess or larger is 1.9%. These data are used to determine B(B-s(0) --> mu(+)mu(-)) = (1.8(-0.9)(+1.1)) x 10(-8) and provide an upper limit of B(B-s(0) --> mu(+)mu(-)) < 4.0 x 10(-8) at 95% confidence level.
Search for B⁰ₛ → μ⁺μ⁻ and B⁰ → μ⁺μ⁻ decays with CDF II
Ciocci M. A.;DELL'ORSO, MAURO;DONATI, SIMONE;PUNZI, GIOVANNI;Ruffini F.;
2011-01-01
Abstract
A search has been performed for B-s(0) --> mu(+)mu(-) and B-0 --> mu(+)mu(-) decays using 7 fb(-1) of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. The observed number of B-0 candidates is consistent with background- only expectations and yields an upper limit on the branching fraction of B(B-0 --> mu(+)mu(-)) < 6.0 X 10(-9) at 95% confidence level. We observe an excess of B-s(0) 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 of B-s(0) --> mu(+)mu(-) could produce such an excess or larger is 1.9%. These data are used to determine B(B-s(0) --> mu(+)mu(-)) = (1.8(-0.9)(+1.1)) x 10(-8) and provide an upper limit of B(B-s(0) --> mu(+)mu(-)) < 4.0 x 10(-8) at 95% confidence level.File | Dimensione | Formato | |
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PhysRevLett.107.191801.pdf
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