S. Levy

Search for the rare decays B{sup +}{yields}{mu}{sup +}{mu}{sup -}K{sup +}, B{sup 0}{yields}{mu}{sup +}{mu}{sup -}K*(892){sup 0}, and B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -}{phi} at CDF

We search for b → sμ + μ - transitions in B meson (B + , B°, or B 0 s ) decays with 924 pb -1 of pp collisions at s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. We find excesses with significances of 4.5, 2.9, and 2.4 standard deviations in the B + → μ + μ - K + , B 0 → μ + μ - K*(892) 0 , and B 0 s → μ + μ - Φ decay modes, respectively. Using B → J/ψh (h = K + , K*(892) 0 , Φ) decays as normalization channels, we report branching fractions for the previously observed B + and B° decays, B(B + → μ + μ - K + ) = (0.59 ± 0.15 ± 0.04) X 10 -6 , and B(B 0 → μ + μ - K*(892) 0 ) = (0.81 ± 0.30 ± 0.10) × 10 -6 , where the first uncertainty is statistical, and the second is systematic. We set an upper limit on the relative branching fraction B(B 0 s → μ + μ - Φ)/Β(Β 0 s → J/ψΦ) < 2.6(2.3) X 10 -3 at the 95(90)% confidence level, which is the most stringent to date.We search for b{yields}s{mu}{sup +}{mu}{sup -} transitions in B meson (B{sup +}, B{sup 0}, or B{sub s}{sup 0}) decays with 924 pb{sup -1} of pp collisions at {radical}(s)=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. We find excesses with significances of 4.5, 2.9, and 2.4 standard deviations in the B{sup +}{yields}{mu}{sup +}{mu}{sup -}K{sup +}, B{sup 0}{yields}{mu}{sup +}{mu}{sup -}K*(892){sup 0}, and B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -}{phi} decay modes, respectively. Using B{yields}J/{psi}h (h=K{sup +}, K*(892){sup 0}, {phi}) decays as normalization channels, we report branching fractions for the previously observed B{sup +} and B{sup 0} decays, B(B{sup +}{yields}{mu}{sup +}{mu}{sup -}K{sup +})=(0.59{+-}0.15{+-}0.04)x10{sup -6}, and B(B{sup 0}{yields}{mu}{sup +}{mu}{sup -}K*(892){sup 0})=(0.81{+-}0.30{+-}0.10)x10{sup -6}, where the first uncertainty is statistical, and the second is systematic. We set an upper limit on the relative branching fraction B(B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -}{phi})/B(B{sub s}{sup 0}{yields}J/{psi}{phi})<2.6(2.3)x10{sup -3} at the 95(90)% confidence level, which is the most stringent to date.

Search for B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -} and B{sup 0}{yields}{mu}{sup +}{mu}{sup -} Decays with 2 fb{sup -1} of pp Collisions

We have performed a search for Bs0→μ+μ- and B0→μ+μ- decays in pp¯ collisions at √s=1.96  TeV using 2  fb-1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron Collider. The observed number of Bs0 and B0 candidates is consistent with background expectations. The resulting upper limits on the branching fractions are B(Bs0→μ+μ-)<5.8×10-8 and B(B0→μ+μ-)<1.8×10-8 at 95% C.L.We have performed a search for B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -} and B{sup 0}{yields}{mu}{sup +}{mu}{sup -} decays in pp collisions at {radical}(s)=1.96 TeV using 2 fb{sup -1} of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron Collider. The observed number of B{sub s}{sup 0} and B{sup 0} candidates is consistent with background expectations. The resulting upper limits on the branching fractions are B(B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -})<5.8x10{sup -8} and B(B{sup 0}{yields}{mu}{sup +}{mu}{sup -})<1.8x10{sup -8} at 95% C.L.

Observation of the Decay B{sub c}{sup {+-}}{yields}J/{psi}{pi}{sup {+-}} and Measurement of the B{sub c}{sup {+-}} Mass

The B{sub c}{sup {+-}} meson is observed through the decay B{sub c}{sup {+-}}{yields}J/{psi}{pi}{sup {+-}}, in data corresponding to an integrated luminosity of 2.4 fb{sup -1} recorded by the Collider Detector at Fermilab II detector at the Fermilab Tevatron. A signal of 108{+-}15 candidates is observed, with a significance that exceeds 8{sigma}. The mass of the B{sub c}{sup {+-}} meson is measured to be 6275.6{+-}2.9(stat){+-}2.5(syst) MeV/c{sup 2}.