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EnglishWe report the first observation of the baryonic flavor-changing neutral current decay Lambda(0)(b) -> Lambda mu(+)mu(-) with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a p (p) over bar collisions data sample corresponding to 6.8 fb(-1) at root s = 1.96 TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for Lambda(0)(b) -> Lambda mu(+)mu(-) are measured. We find B(Lambda(0)(b) -> Lambda mu(+)mu(-)) = [1.73 +/- 0.42(stat) +/- (syst)] x 10(-6). We also report the first measurement of the differential branching ratio of B-s(0) -> phi mu(+)mu(-), using 49 signal events. In addition, we report branching ratios for B+ -> K+mu(+)mu(-), B-0 -> K-0 mu(+)mu(-), and B -> K*(892)mu(+)mu(-) decays. RI Robson, Aidan/G-1087-2011; De Cecco, Sandro/B-1016-2012; St.Denis, Richard/C-8997-2012; Prokoshin, Fedor/E-2795-2012
| Titolo: | Observation of the Baryonic Flavor-Changing Neutral Current Decay Lambda(0)(b) -> Lambda mu(+)mu(-) |
| Autori: | |
| Data di pubblicazione: | 2011 |
| Rivista: | |
| Abstract: | We report the first observation of the baryonic flavor-changing neutral current decay Lambda(0)(b) -> Lambda mu(+)mu(-) with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a p (p) over bar collisions data sample corresponding to 6.8 fb(-1) at root s = 1.96 TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for Lambda(0)(b) -> Lambda mu(+)mu(-) are measured. We find B(Lambda(0)(b) -> Lambda mu(+)mu(-)) = [1.73 +/- 0.42(stat) +/- (syst)] x 10(-6). We also report the first measurement of the differential branching ratio of B-s(0) -> phi mu(+)mu(-), using 49 signal events. In addition, we report branching ratios for B+ -> K+mu(+)mu(-), B-0 -> K-0 mu(+)mu(-), and B -> K*(892)mu(+)mu(-) decays. RI Robson, Aidan/G-1087-2011; De Cecco, Sandro/B-1016-2012; St.Denis, Richard/C-8997-2012; Prokoshin, Fedor/E-2795-2012 |
| Handle: | http://hdl.handle.net/11384/5435 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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