Strong Interaction Corrections To The Weak Radiative B Meson Decay At Order O Alfa S2 With Exact Dependence On The C Quark Mass PDF Download

The radiative decays of the B meson to the final states K*(892)[gamma] and[rho](770)[gamma] proceed through virtual effective flavor-changing neutral current processes which are sensitive to contributions from high mass scales from within the Standard Model of particle interactions and from possible new physics. In the context of the Standard Model, these transitions are of interest in probing the weak interaction behavior of the top quark. In particular, the ratio of branching fractions for the two processes can be used to extract the ratio of Cabibbo-Kobayashi-Maskawa matrix elementsV[sub td]/V[sub ts]. Potential new physics contributions in these virtual transitions may induce new sources of direct CP violation and enhancement or suppression of the rate of these processes. The B[yields] K*[gamma] is a manifestation of the b[yields] s[gamma] radiative transition. This process has been previously observed by the CLEO collaboration and its branching fraction measured. While the theoretical prediction for the inclusive rate of b[yields] s[gamma] transitions is more robust than that of the exclusive B[yields] K*[gamma], the prospects for precise measurements of[Beta][B[yields] K*[gamma]] and direct CP violation in this channel has attracted considerable attention. The analysis described here represents an improved measurement of the B[yields] K*[gamma] branching factions and a more sensitive search for direct CP violation. In 22.7 x 10[sup 6] B[bar B] events collected by the BABAR detector in 1999-2000, we measure:[Beta][B[sup 0][yields] K*[sup 0][gamma]]= 4.23[+-] 0.40(stat.)[+-] 0.22(syst.) x 10[sup -5] and[Beta][B[sup+][yields] K*[sup+][gamma]]= 3.83[+-] 0.62(stat.)[+-] 0.22(syst.) x 10[sup -5]. We find no evidence for direct CP violation in the decays and constrain -0.170