Flavor and CP violating Z exchange and the rate asymmetry in B --> phi K_S

Details Flavor and CP violating Z exchange and the rate asymmetry in B --> phi K_S Flavor and CP violating Z exchange and the rate asymmetry in B --> phi K_S

2003-11-26

arxiv.org/abs/hep-ph/0311332v3

Phys.Lett. B593 (2004) 135-142

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, Latex, 2 postscript figures. Sections 2 and 3 are reordered. More references are added. Version to be published in P

Scientific paper

10.1016/j.physletb.2004.04.060

Recent measurements of time dependent CP asymmetry in B --> phi K_S, if confirmed, would indicate a new source of CP violation. We examine flavor violating tree-level Z currents in models with extra down-type quark singlets that arise naturally in string compactified gauge groups like E_6. We evaluate the new operators at the scale mu = m_b in NLO, and using QCD improved factorization to describe B --> phi K_S, find the allowed range of parameters for rho and psi, the magnitude and phase of the flavor violating parameter U_{bs}. This allowed range does satisfy the constraint from flavor changing process b --> s l+ l- . However, further improvement in measurement of these rates could severely constrain the model.

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