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Using 88.9 million B{bar B} events collected by the BABAR detector at the?(4S), they measure the branching fraction for the radiative penguin process B → X{sub s}? from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy E{sub?}> 1.9 GeV is?(b → s?) = (3.27 ± 0.18(stat.){sub -0.40}{sup +0.55}(syst.){sub -0.09}{sup +0.04}(theory)) x 10−4. They also measure the isospin asymmetry between B− → X{sub s{bar u}}? and {bar B}° → X{sub sd}{gamma} to be?0 = -0.006 ± 0.058(stat.) ± 0.009(syst.) ± 0.024({bar B}°/B−). The photon energy spectrum is measured in the B rest frame, from which moments are derived for different values of the minimum photon energy. They present fits to the photon spectrum and moments which give the heavy-quark parameters m{sub b} and?{sub {pi}}2. The fitted parameters are consistent with those obtained from semileptonic B → X{sub c}l? decays, and are useful inputs for the extraction of.
We present a measurement of the branching fraction and photon energy spectrum for the decay B → X{sub s}[gamma] using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210 fb−1, from which approximately 680,000 B{bar B} events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure [Beta](B → X{sub s}[gamma]) = (3.66 ± 0.85{sub stat} ± 0.60{sub syst}) x 10−4 for photon energies E{sub {gamma}} above 1.9 GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters m{sub b} and [mu]{sub {pi}}2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.
We use 429 fb−1 of ee− collision data collected at the?(4S) resonance with the BABAR detector to measure the radiative transition rate of b → s? with a sum of 38 exclusive final states. The inclusive branching fraction with a minimum photon energy of 1.9 GeV is found to be?({bar B} → Xs?) = (3.29 ± 0.19 ± 0.48) x 10−4 where the first uncertainty is statistical and the second is systematic. We also measure the first and second moments of the photon energy spectrum and extract the best fit values for the heavy-quark parameters, m{sub b} and?{sub {pi}}2, in the kinetic and shape function models.
The photon spectrum in B 2!X{sub s}[gamma] decay, where X{sub s} is any strange hadronic state, is studied using a data sample of 88.5 x 106 ee− 2![Upsilon](4S) 2!B{bar B} decays collected by the BABAR experiment at SLAC. The partial branching fraction, [Delta][Beta](B 2!X{sub s}[gamma]) = (3.67 ± 0.29(stat.) ± 0.34(sys.) ± 0.29(model)) x 10−4, the first moment E{sub {gamma}} = 2.288 ± 0.025 ± 0.017 ± 0.015 GeV and the second moment E{sub {gamma}}2 = 0.0328 ± 0.0040 ± 0.0023 ± 0.0036 GeV2 are measured for the photon energy range 1.9 GeV E{sub {gamma}}
We use 772 × 106 BB-bar meson pairs collected at the ?(4S) resonance with the Belle detector to measure the branching fraction for B-bar → Xs?. Our measurement uses a sum-of-exclusives approach in which 38 of the hadronic final states with strangeness equal to +1, denoted by Xs, are reconstructed. The inclusive branching fraction for MXs 2.8 GeV/c2, which corresponds to a minimum photon energy of 1.9 GeV, is measured to be B(B-bar → Xsubs/sub?)=(3.51±0.17±0.33) × 10sup–4
The electromagnetic penguin process b [yields] s[gamma] is very interesting to theorists because it can be used to constrain contributions from new physics that could enter at the one loop level. The high statistics of B[bar B] events collected at the BABAR experiment make a measurement of this rare decay possible. The branching fraction of a sum of exclusive b [yields] s[gamma] decay modes is measured as a function of the strange hadronic mass. This is a large step toward the measurement of the b [yields] s[gamma] rate.
We measure the branching fraction for the flavor-changing neutral-current process B [yields] X[sub s][ell][sup +][ell][sup -] with a sample of 89 x 10[sup 6] [Upsilon](4S) [yields] B[bar B] events recorded with the BABAR detector at the PEP-II e[sup +]e[sup -] storage ring. The final state is reconstructed from e[sup +]e[sup -] or [mu][sup +][mu][sup -] pairs and a hadronic system X[sub s] consisting of one K[sup [+-]] or K[sub s][sup 0] and up to two pions, with at most one [pi][sup 0]. We observe a signal of 40 [+-] 10(stat) [+-] 2(syst) events and extract the inclusive branching fraction [Beta] (B [yields] X[sub s][ell][sup +][ell][sup -]) = (5.6 [+-] 1.5(stat) [+-] 0.6(exp syst) [+-] 1.1(model syst)) x 10[sup -6] for m[sub [ell][sup +][ell][sup -]]> 0.2 GeV/c[sup 2].
The authors present a measurement of the partial branching fractions and mass spectra of the exclusive radiative penguin processes B {yields} K{pi}{pi}{gamma} in the range m{sub K{pi}{pi}}
The authors present measurements of the B {yields} {eta}K{gamma} branching fractions and upper limits for the B {yields} {eta}'K{gamma} branching fractions. For B{sup +} {yields} {eta}K{sup +}{gamma} they also measure the time-integrated charge asymmetry. The data sample, collected with the BABAR detector at the Stanford Linear Accelerator Center, represents 232 x 10{sup 6} produced B{bar B} pairs. The results for branching fractions and upper limits at 90% C.L. in units of 10{sup -6} are: {Beta}(B{sup 0} {yields} {eta}K{sup 0}{gamma}) = 11.3{sub -2.6}{sup +2.8} {+-} 0.6, {Beta}(B{sup +} {yields} {eta}K{sup +}{gamma}) = 10.0 {+-} 1.3 {+-} 0.5, {Beta}(B{sup 0} {yields} {eta}'K{sup 0}{gamma})