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| Release | : 2004 |
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| Author | : Deutsches Elektronen-Synchrotron (Center) |
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| Release | : 2004 |
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| Author | : HERA B Collaboration |
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| Total Pages | : 8 |
| Release | : 2010 |
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We report on a search for the flavor-changing neutral-current decay D° →??− in p{bar p} collisions at √s = 1.96TeV using 360 pb−1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. A displaced vertex trigger selects long-lived D° candidates in the?+?−,?+?−, and K−?+ decay modes. We use the Cabibbo-favored D° → K−?+ channel to optimize the selection criteria in an unbiased manner, and the kinematically similar D° →?+?− channel for normalization. We set an upper limit on the branching fraction?(D° →?+?−)
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We report on a search for the flavor-changing neutral-current decays K/sub L/° .-->. .pi.°ee/sup /minus//, K/sub L/° .-->. ee/sup /minus// and K/sub L/° .-->. .mu./sup +-/e/sup /minus plus//. Limits obtained for these processes are BR(K/sub L/° .-->. .pi.°e+e/sup /minus//) 3.2 x 10/sup /minus/7/, BR(K/sub L/° .--. e+e/sup /minus//) 1.2 x 10/sup /minus/9/, BR(K/sub L/° .--. .mu./sup +-/e/sup /minus plus//)
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| Release | : 2004 |
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The authors report on a search for the flavor-changing neutral current decays D[sup 0] --> e[sup +]e[sup -] and D[sup 0] --> [mu][sup +][mu][sup -], and the lepton-flavor violating decay D[sup 0] --> e[sup [+-]][mu][sup [-+]]. The measurement is based on 122 fb[sup -1] of data collected by the BABAR detector at the PEP-II asymmetric e[sup +]e[sup -] collider. No evidence is found for any of the decays. The upper limits on the branching fractions, at the 90% confidence level, are 1.2 x 10[sup -6] for D[sup 0] --> e[sup +]e[sup -], 1.3 x 10[sup -6] for D[sup 0] --> [mu][sup +][mu][sup -], and 8.1 x 10[sup -7] for D[sup 0] --> e[sup [+-]][mu][sup [-+]].
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| Total Pages | : 7 |
| Release | : 2006 |
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The authors present a search for the flavor-changing neutral current decay B{sub s}° →???− using about 0.45 fb−1 of data collected in p{bar p} collisions at √s = 1.96 TeV with the D0 detector at the Fermilab Tevatron Collider. They find an upper limit on the branching ratio of this decay normalized to B{sub s}° → J/?? of?(B{sub s}° →??+?−)/?(B{sub s}° → J/??)
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| Total Pages | : 5 |
| Release | : 2004 |
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The authors report on a search for the flavor-changing neutral current decays D° --> ee− and D° -->?+?−, and the lepton-flavor violating decay D° --> e{sup {+-}}?{sup {-+}}. The measurement is based on 122 fb−1 of data collected by the BABAR detector at the PEP-II asymmetric e+e− collider. No evidence is found for any of the decays. The upper limits on the branching fractions, at the 90% confidence level, are 1.2 x 10−6 for D° --> e+e−, 1.3 x 10−6 for D° -->?+?−, and 8.1 x 10−7 for D° --> e{sup {+-}}?{sup {-+}}.
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The authors present preliminary results from a search for the rare, flavor-changing neutral current decays B[yields] K[ell][sup+][ell][sup -] and B[yields] K*[ell][sup+][ell][sup -], where[ell][sup+][ell][sup -] is either an e[sup+]e[sup -] or[mu][sup+][mu][sup -] pair. The data sample comprises (84.4[+-] 0.9) x 10[sup 6][Upsilon](4S)[yields] B[bar B] decays (77.8 fb[sup -1]) collected with the BaBar detector at the PEP-II B Factory. For B[yields] K[ell][sup+][ell][sup -], they observe a signal with estimated significance of 4.4[sigma] and obtain[Beta](B[yields] K[ell][sup+][ell][sup -])= (0.78[sub -0.20-0.18][sup+0.24+0.11]) x 10[sup 06] (averaged over[ell]= e and[mu]). For B[yields] K*[ell][sup+][ell][sup -], they observe an excess of events over background with estimated significance of 2.8[sigma]. They obtain[Beta](B[yields] K*[ell][sup+][ell][sup -])= (1.68[sub -0.58][sup+0.68][+-] 0.28) x 10[sup -6] and the 90% C.L. upper limit[Beta](B[yields] K*[ell][sup+][ell][sup -])
