Direct CP asymmetry of B -> X-d,(s)gamma in a model with vector quarks

作者：Akeroyd AG^*; Recksiegel S

来源：Physics Letters B, 2002, 525(1-2): 81-88.

DOI：10.1016/S0370-2693(01)01419-8

• CP asymmetry
• rare B decay
• vector quarks

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.

• 出版日期2002-1-17