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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.
Using a sample of 471 million B{bar B} events collected with the BaBar detector, we study the sum of seven exclusive final states b → X{sub s(d)}?, where X{sub s(d)} is a strange (non-strange) hadronic system with a mass of up to 2.0 Gev/c2. After correcting for unobserved decay modes, we obtain a branching fraction for b → d? of (9.2 ± 2.0(stat.) ± 2.3(syst.)) x 10−6 in this mass range, and a branching fraction for b → s? of (23.0 ± 0.8(stat.) ± 3.0(syst.)) x 10−5 in the same mass range. We find BF(b → d?)/BF(b → s?) = 0.040 ± 0.009(stat.) ± 0.010(syst.), from which we determine.
Using a sample of 471 million B{bar B} events collected with the BABAR detector, we study the sum of seven exclusive final states B → X{sub s(d)[gamma]}, where X{sub s(d)} is a strange (non-strange) hadronic system with a mass of up to 2.0 GeV/c2. After correcting for unobserved decay modes, we obtain a branching fraction for b → d[gamma] of (9.2 ± 2.0(stat.) ± 2.3(syst.)) x 10−6 in this mass range, and a branching fraction for b → s[gamma] of (23.0 ± 0.8(stat.) ± 3.0(syst.)) x 10−5 in the same mass range. We find [Beta](b→d[gamma])/[Beta](b→s{gamma}) = 0.040 ± 0.009(stat.) ± 0.010(syst.), from which we determine.
The b [yields] s[gamma] decay represents a possible electromagnetic ''loop'' penguin decay of the B meson. This FCNC process is of high theoretical interest because various scenarios of new physics are expected to have contributions at the same (one loop) level as the Standard Model. The large sample of B[bar B] meson decays collected by the BaBar experiment makes a precision measurement of this rare decay possible. In conjunction with Standard Model predictions at the 10% level, it brings new physics effects into the realm of detection--or seriously constrains models that could predict them. A fully inclusive technique is presented to study the b [yields] s[gamma] transition as a function of photon energy, using 88.5 [+-] 1.0 x 10[sup 6] B[bar B] meson decays collected by the BaBar experiment in the years 2000 to 2002. The expected statistical and systematic uncertainties have been fully determined which enables first comparisons with theoretical predictions and other experimental results. It also lays the basis for the determination of the inclusive branching fraction [Beta](B [yields] X[sub s][gamma]) and the measurement of the photon energy spectrum.
This volume contains contributions to the XXI International Symposium on Lepton and Photon Interactions at High Energies, held at the Fermi National Accelerator Laboratory. It gives up-to-date reviews of all aspects of particle physics, written by leading practitioners in the field. The review nature of all the articles makes this volume more accessible to students and researchers in other fields of physics. In addition to new experimental data and advances in theory, the future directions and prospects for the field are covered.