Branching Ratio and CP-asymmetry for B-> 1^{1}P_{1}gamma decays

Details Branching Ratio and CP-asymmetry for B-> 1^{1}P_{1}gamma decays Branching Ratio and CP-asymmetry for B-> 1^{1}P_{1}gamma decays

2006-07-11

arxiv.org/abs/hep-ph/0607114v1

Phys.Rev.D75:034004,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures

Scientific paper

10.1103/PhysRevD.75.034004

We calculate the branching ratios for B_{d}^{0}->(b_{1},h_{1})gamma at next-to-leading order (NLO) of alpha_{s} where b_{1} and h_{1} are the corresponding radially excited axial vector mesons of rho and omega respectively. Using the SU(3)symmetry for the form factor, the branching ratio for B_{d}^{0}->(b_{1},h_{1})gamma is expressed in terms of the branching ratio of the B_{d}^{0}-> K_{1}gamma and it is found to be B(B_{d}^{0}->b_{1}gamma)=0.71* 10^{-6} and B(B_{d}^{0}-> h_{1}gamma) =0.74*10^{-6}. We also calculate direct CP asymmetry for these decays and find, in confirmity with the observations made in the literature, that the hard spectator contributions significantely reduces the asymmetry arising from the vertex corrections alone. The value of CP-asymmetry is 10% and is negative like rho and omega in the Standard Model.

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