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

Abstract

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

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

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• Observation of Large CP Violation in the Neutral B Meson System
• Observation of CP violation in the B^0 meson system
• Quark mass effects in B -> Xs gamma
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Cited by in corpus (9)

• Untagged B -> X_(s+d) gamma CP asymmetry as a probe for new physics
• Measurement of the CP Asymmetry in B -> X_s gamma
• Large enhancement of D -> e nu and Ds -> e nu in R Parity violating SUSY models
• CP asymmetries of $\overline{B}\to X_s/X_d\gamma$ in models with three Higgs doublets
• Particle identification performance of the prototype Aerogel RICH counter for the Belle II experiment
• Solving the SUSY CP problem with flavor breaking F-terms
• Constraints on the quark mixing matrix with vector-like quarks
• A model with vectorlike fermions and $U(1{)}_X$ symmetry: CKM unitarity, $b\to s$ transitions, and prospect at Belle II
• Direct CP asymmetry of b -> s gamma and b -> d gamma in models beyond the Standard Model