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The authors present preliminary measurements of branching fractions of the b[yields] s[bar s]s penguin-dominated decays B[sup[+-]][yields][phi]K[sup[+-]] and B[sup 0][yields][phi]K[sup 0] in a sample of approximately 89 million B[bar B] pairs collected by the BABAR detector at the PEP-II asymmetric-energy B-meson Factor at SLAC. They determine[Beta](B[sup[+-]][yields][phi]K[sup[+-]])= (10.0[sub -0.8][sup+0.9](stat.)[+-] 0.5(syst.)) x 10[sup -6] and[Beta](B[sup 0][yields][phi]K[sup 0])= (7.6[sub -1.2][sup+1.3](stat.)[+-] 0.5(syst.)) x 10[sup -6]. Additionally, they measure the charge asymmetry[Alpha][sub CP](B[sup[+-]][yields][phi]K[sup[+-]])= 0.039[+-] 0.086(stat.)[+-] 0.011(syst.) and set an upper limit on the CKM- and color-suppressed decay B[sup[+-]][yields][phi][pi][sup[+-]], [Beta](B[sup[+-]][yields][phi][pi][sup[+-]])
The authors present measurements of branching fractions in the b 2!s{bar s}s penguin-dominated decays B 2![phi]K and B° 2![phi]K° in a sample of approximately 89 million B{bar B} pairs collected by the BABAR detector at the PEP-II asymmetric-energy B-meson Factory at SLAC. They determine [Beta](B+ 2![phi]K+) = (10.0{sub -0.8}{sup +0.9} ± 0.5) x 10−6 and [Beta](B° 2![phi]K°) = (8.4{sub -1.3}{sup +1.5} ± 0.5) x 10−6. Additionally, they measure the CP-violating charge asymmetry [Alpha]{sub CP}(B{sup ±} 2![phi]K{sup ±}) = 0.04 {+-} 0.09 {+-} 0.01, with a 90% confidence-level interval of [-0.10, 0.18], and set an upper limit on the CKM- and color-suppressed decay B+ 2![phi][pi]+, [Beta](B+ 2![phi][pi]+)
The authors present measurements of branching fractions in the b[yields] s[bar s]s penguin-dominated decays B[sup+][yields][phi]K[sup+] and B[sup 0][yields][phi]K[sup 0] in a sample of approximately 89 million B[bar B] pairs collected by the BABAR detector at the PEP-II asymmetric-energy B-meson Factory at SLAC. They determine[Beta](B[sup+][yields][phi]K[sup+])= (10.0[sub -0.8][sup+0.9][+-] 0.5) x 10[sup -6] and[Beta](B[sup 0][yields][phi]K[sup 0])= (8.4[sub -1.3][sup+1.5][+-] 0.5) x 10[sup -6]. Additionally, they measure the CP-violating charge asymmetry[Alpha][sub CP](B[sup[+-]][yields][phi]K[sup[+-]])= 0.04[+-] 0.09[+-] 0.01, with a 90% confidence-level interval of[-0.10, 0.18], and set an upper limit on the CKM- and color-suppressed decay B[sup+][yields][phi][pi][sup+], [Beta](B[sup+][yields][phi][pi][sup+])
We present measurements of the branching fractions, longitudinal polarization, and direct CP-violation asymmetries for the decays B →?°K*+ and B+ f0(980)K*+ with a sample of (467 ± 5) x 106 B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e− collider at the SLAC National Accelerator Laboratory. We observe B+ →?°K*+ with a significance of 5.3? and measure the branching fraction?(B+ →?°K*+) = (4.6 ± 1.0 ± 0.4) x 10−6, the longitudinal polarization f{sub L} = 0.78 ± 0.12 ± 0.03, and the CP-violation asymmetry A{sub CP} = 0.31 ± 0.13 ± 0.03. We observe B+ → f0(980)K*+ and measure the branching fraction?(B+ → f0(980)K*+) x?(f0(980) →?+?−) = (4.2 ± 0.6 ± 0.3) x 10−6 and the CP-violation asymmetry A{sub CP} = -0.15 ± 0.12 ± 0.03. The first uncertainty quoted is statistical and the second is systematic.
The authors present measurements of branching fractions in the b → s{bar s}s penguin-dominated decays B →?K+ and B° →?K° in a sample of approximately 89 million B{bar B} pairs collected by the BABAR detector at the PEP-II asymmetric-energy B-meson Factory at SLAC. They determine?(B+ →?K+) = (10.0{sub -0.8}{sup +0.9} ± 0.5) x 10−6 and?(B° →?K°) = (8.4{sub -1.3}{sup +1.5} ± 0.5) x 10−6. Additionally, they measure the CP-violating charge asymmetry?{sub CP}(B{sup ±} →?K{sup ±}) = 0.04 {+-} 0.09 {+-} 0.01, with a 90% confidence-level interval of [-0.10, 0.18], and set an upper limit on the CKM- and color-suppressed decay B+ →??+,?(B+ →??+)
The presented study of the radiative electroweak "penguin"--Decay B->K*(892)gamma, proceeding by the b->sgamma "loop"-transition, provides an important test of the Standard Model and a candidate of the search for New Physics. The used data sample has been recorded at the Y(4S) resonance with the BABAR detector at the asymmetric electron-positron- collider PEP-II of the Stanford Linear Accelerator Center (SLAC) in California. The B->K*gamma branching fractions are measured in four K*-decay modes. A search for direct CP-violation in the B->K*gamma mode has also been carried out.
We report the first reconstruction in hadron collisions of the suppressed decays B-2!D(2!K+[pi]- )K- and B-2!D(2!K+[pi]- )[pi]- decays, sensitive to the CKM phase [gamma], using data from 7 fb-1 of integrated luminosity collected by the CDF II detector at the Tevatron collider. We reconstruct a signal for the B-2!D(2!K+[pi]- )K- suppressed mode with a significance of 3.2 standard deviations, and measure the ratios of the suppressed to favored branching fractions R(K) = [22.0 " 8.6(stat) " 2.6(syst)] x 10-3, R+(K) = [42.6 " 13.7(stat) " 2.8(syst)] x 10-3, R-(K) = [3.8 " 10.3(stat) " 2.7(syst)] x 10-3 as well as the direct CP-violating asymmetry A(K) = -0.82"0.44(stat)"0.09(syst) of this mode. Corresponding quantities for B- 2!D(2!K+[pi]- )[pi]- decay are also reported.