Difference in B^+ and B^0 Direct CP Asymmetry as Effect of a Fourth Generation

Abstract

Direct CP violation in B^0-> K^+π^- decay has emerged at -10% level, but the asymmetry in B^+ -> K^+π^0 mode is consistent with zero. This difference points towards possible New Physics in the electroweak penguin operator. We point out that a sequential fourth generation, with sizable V^*_{t's}V_{t'b} and near maximal phase, could be a natural cause. We use the perturbative QCD factorization approach for B-> Kπamplitudes. While the B^0-> K^+π^- mode is insensitive to t', we critically compare t' effects on direct CP violation in B^+ -> K^+π^0 with b-> s\ell^+\ell^- and B_s mixing. If the K^+π^0-K^+π^- asymmetry difference persists, we predict \sin2Φ_{B_s} to be negative.

Text reorganized, including adding discussion of DCPV in b -> s gamma, to appear in Phys. Rev. Lett

References in corpus (2)

• The B -> pi K Puzzle and New Physics
• Branching Fractions and CP Asymmetries in B0 -> pi0pi0, B+ -> pi+pi0 and B+ -> K+pi0 Decays and Isospin Analysis of the B -> pipi System

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