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EnglishA 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. RI De Cecco, Sandro/B-1016-2012; Robson, Aidan/G-1087-2011; Prokoshin, Fedor/E-2795-2012
http://hdl.handle.net/11384/3641| Titolo: | Search for B-s(0) -> mu(+)mu(-) and B-0 -> mu(+)mu(-) Decays with CDF II |
| Autori interni: | MORELLO, MICHAEL JOSEPH |
| Data di pubblicazione: | 2011 |
| Rivista: | PHYSICAL REVIEW LETTERS |
| 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. RI De Cecco, Sandro/B-1016-2012; Robson, Aidan/G-1087-2011; Prokoshin, Fedor/E-2795-2012 |
| Handle: | http://hdl.handle.net/11384/3641 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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