Title: Measurements of the Branching Fraction, CP Asymmetry And Isospin Asymmetry of the Radiative Penguin B0 ---> K*0 Gamma And a Search for the Decays B0 ---> Rho Gamma And B0 ---> Omega Gamma at BaBar

A search for the decays B --> {rho}(770){gamma} and B{sup 0} --> {omega}(782){gamma} is performed on a sample of 211 million {Upsilon}(4S) --> B{bar B} events collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. No evidence for the decays is seen. The authors set the following limits on the individual branching fractions B(B{sup +} --> {rho}{sup +}{gamma}) < 1.8 x 10{sup -6}, B(B{sup 0} --> {rho}{sup 0}{gamma}) < 0.4 x 10{sup -6}, and B(B{sup 0} --> {omega}{gamma}) < 1.0 x 10{sup -6} at the 90% confidence level (C.L.). They use the quark model tomore » limit the combined branching fraction {bar B}|B --> ({rho}/{omega}){gamma}| < 1.2 x 10{sup -6} and constrain |V{sub td}|/|V{sub ts}| < 0.19 at the 90%. C.L.« less

A review of the results obtained from the analysis of the B meson decays that involve Radiative Penguin processes, recorded at the BaBar experiment at the Stanford Linear Accelerator Center PEP-II B-Factory, is presented. The physics interest of these processes and their SM prediction are discussed briefly. The most relevant selection techniques used in the analysis are described before quoting the latest results made public by the BaBar collaboration as of July 2003.

The purpose of this analysis is the simultaneous measurement of the branching fraction, the longitudinal-polarization component, and the direct-CP-violating charge asymmetry for the B --> vector-vector decay mode B{sup +} --> K*{sup 0}{rho}{sup +}, which has previously not been seen experimentally. The measurement of the polarization of the penguin decay is of special interest. There is no tree contribution to the decay amplitude and only a very small annihilation process. The polarization of the B{sup +} --> K*{sup 0}{rho}{sup +} decay mode can be compared to that already measured for the similar penguin decay B --> K*{phi}.

Electromagnetic radiative penguin decays of the B meson were studied with the BaBar detector at SLAC's PEP-II asymmetric-energy B Factory. Branching fractions and isospin asymmetry of the decay B {yields} K*{gamma}, branching fractions of B {yields} K*{sub 2}(1430){gamma}, and a search for B{sup 0} {yields} {phi}{gamma} are presented. The decay rates may be enhanced by contributions from non-standard model processes.

A search for the decays B {yields} {rho}(770){gamma} and B{sup 0} {yields} {omega}(782) is performed on a sample of 211 million {Upsilon}(4S) {yields} B{bar B} events collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. No evidence for the decays is seen. We set the following limits on the individual branching fractions {Beta}(B{sup +} {yields} {rho}{sup +}{gamma}) < 1.8 x 10{sup -6}, {Beta}(B{sup 0} {yields} {rho}{sup 0}{gamma}) < 0.4 x 10{sup -6}, and {Beta}(B{sup 0} {yields} {omega}{gamma}) < 1.0 x 10{sup -6} at the 90% confidence level (C.L.). We use the quark model to limitmore » the combined branching fraction {bar {Beta}}[B {yields} ({rho}/{omega}){gamma}] < 1.2 x 10{sup -6} and constrain |V{sub td}|/|V{sub ts}|.« less