Radion Flavor Violation in Warped Extra Dimension

TL;DR

This paper investigates how radion mediation in warped extra dimensions causes flavor violation, constraining radion parameters and predicting observable effects in meson decays and collider experiments.

Contribution

It provides the first detailed analysis of radion-induced flavor violation constraints and potential signals in meson decays and collider searches.

Findings

Radion mass constrained to around 65 GeV for \\Lambda_\\phi ~ 1 TeV.

Branching ratio of B_s \\to \\mu^+ \\mu^- can reach 10^{-8}.

Radion signatures could be observed via flavor-violating decays at the LHC.

Abstract

We analyze the flavor violation in warped extra dimension due to radion mediation. We show that \Delta S=2 and \Delta B=2 flavor violating processes impose stringent constraints on radion mass, m_\phi and the scale \Lambda_\phi. In particular, for \Lambda_\phi ~ O(1) TeV, B_d^0-\bar{B}^0_d implies that m_\phi ~ 65 GeV. We also study radion contributions to lepton flavor violating processes: \tau -> (e,\mu) \phi, \tau -> e\mu^+\mu^- and B -> l_i l_j. We show that BR(B_s -> \mu^+ \mu^-) can be of order 10^{-8}, which is reachable at the LHCb. The radion search at LHC, through the flavor violation decays into \tau \mu or top-charm quarks, is also considered.