Direct CP Asymmetry of B -> X_d,s γin a model with Vector quarks

Details Direct CP Asymmetry of B -> X_d,s γin a model with Vector quarks Direct CP Asymmetry of B -> X_d,s γin a model with Vector quarks

2001-09-11

arxiv.org/abs/hep-ph/0109091v2

Phys.Lett. B525 (2002) 81-88

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 6 figures. v2: Minor changes, 3 references added, to be publ. in PLB

Scientific paper

10.1016/S0370-2693(01)01419-8

We investigate the effect of vector quarks on the inclusive decays B -> X_d,s \gamma. We show that the branching ratio of B -> X_d \gamma can 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 (A_CP) for B -> X_s \gamma are sensitive to the contribution from B -> X_d \gamma. For a sufficiently enhanced BR(B -> X_d \gamma) we show that the dominant contribution to the combined asymmetry may be from B -> X_d \gamma. Thus any large value for A_CP should not immediately be attributed to B -> X_s \gamma, which stresses the importance of good K/pi separation.

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