Radiative charmless B_{(s)}\to V γand B_{(s)}\to A γdecays in pQCD approach

Details Radiative charmless B_{(s)}\to V γand B_{(s)}\to A γdecays in pQCD approach Radiative charmless B_{(s)}\to V γand B_{(s)}\to A γdecays in pQCD approach

2007-11-03

arxiv.org/abs/0711.0432v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

54 pages, 9 figures. Typos are corrected and more references are added

Scientific paper

We study the radiative charmless $B_{(s)}\to V(A)\gamma $ decays in perturbative QCD (pQCD) approach to the leading order in $\alpha_s$ (here $V$ and $A$ denotes vector mesons and two kinds of axial-vector mesons: $^3P_1$ and $^1P_1$ states, respectively.). Our predictions of branching ratios are consistent with the current available experimental data. We update all $B_{(s)}\to V$ form factors and give the predictions for $B\to A$ form factors using the recent hadronic inputs. In addition to the dominant factorizable spectator diagrams, which is form factor like, we also calculate the so-called ``power suppressed'' annihilation type diagrams, the gluonic penguin, charming penguin, and two photon diagrams. These diagrams give the main contributions to direct CP asymmetries, mixing-induced CP asymmetry variables, the isospin asymmetry and U-spin asymmetry variables. Unlike the branching ratios, these ratios or observables possess higher theoretical precision in our pQCD calculation, since they do not depend on the input hadronic parameters too much. Most of the results still need experimental tests in the on-going and forthcoming experiments.

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