Direct CP Asymmetry of B -> Xd,s γin a model with Vector quarks
A. G. Akeroyd, S. Recksiegel
Abstract
We investigate the effect of vector quarks on the inclusive decays B -> Xd,s γ. We show that the branching ratio of B -> Xd γcan differ sizably from the SM and MSSM predictions, being enhanced to present experimental observability or suppressed such that present runs of the B factories would not observe it. Current measurements of the direct CP asymmetry (ACP) for B -> Xs γare sensitive to the contribution from B -> Xd γ. For a sufficiently enhanced BR(B -> Xd γ) we show that the dominant contribution to the combined asymmetry may be from B -> Xd γ. Thus any large value for ACP should not immediately be attributed to B -> Xs γ, which stresses the importance of good K/pi separation.
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