Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk Standard Model and B -> X_s gamma

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  • 30 March 2002
Abstract
We study the top quark Kaluza-Klein (KK) mode mixing in the Randall-Sundrum (RS) scenario, where all the SM fields except the Higgs field are in the bulk. To avoid the problems of FCNC, for all three generations the universal bulk fermion mass m_psi are assumed. The degeneracy in the KK masses of quarks leads to the GIM cancellation KK-level by level. However, Yukawa mass terms for the top quark generate the mixing among its KK modes. The degeneracy in the KK masses of up-type quarks is broken and their contribution to FCNC is inevitable. The current measurements of Br(B -> X_s+gamma) with 99% CL strongly constrain the effective weak scale k_{EW}: k_{EW} > 2 TeV for m_psi/k=-0.3 and k_{EW} > 3 TeV for m_psi/k=-0.4, where k is the AdS_5 curvature. Moreover, high energy collider and rare B decays can play complementary roles to probe the effects of the RS-bulk SM: The m_psi/k=-0.3 (m_psi/k=-0.4) case generates larger (smaller) collider signatures but smaller (larger) b -> s gamma contribution.

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