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

Abstract

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.

arXiv comment15 pages, Latex, 2 postscript figures. Sections 2 and 3 are reordered. More references are added. Version to be published in PLB

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• Implications of the non-universal Z boson in FCNC mediated rare decays
• Implications of Canonical Gauge Coupling Unification in High-Scale Supersymmetry Breaking
• Effect of FCNC mediated Z boson on lepton flavor violating decays
• $B_s^0-{\bar{B}}_s^0$ mixing and $b\to s$ transitions in isosinglet down quark model
• Signature of new physics in B -> phi pi decay
• CP asymmetry in B \to phi K_S in a SUSY SO(10) GUT
• CP violation in beauty decays
• Isospin of new physics in $|\Delta S|=1$ charmless B decays
• Time dependent CP asymmetry in $B^0\to {\rho }^0\gamma$ decay to probe the origin of CP violation
• New Physics in b --> s bar(s) s Decay
• Implication of Z-mediated FCNC on semileptonic decays $B_s\to \varphi l^{+}{l}^{-}$ and $B^{+}\to K^{+}{l}^{+}{l}^{-}$
• Inspection of new physics in ${\mathrm{B}}_{\mathrm{s}}^0\to {\mathrm{K}}^{+}{\mathrm{K}}^{-}$ decay mode
• Scrutinizing new physics of $B_d\to \varphi ({\eta }^{{(}^{\prime })},\pi ,\omega )$ decay modes