The Impact of Universal Extra Dimensions on B -> Xs gamma, B -> Xs gluon, B -> Xs mu+ mu-, KL -> pi0 e +e-, and epsilon'/epsilon
Abstract
We calculate the contributions of the Kaluza-Klein (KK) modes to the gamma-penguins, gluon-penguins, gamma-magnetic penguins and chromomagnetic penguins in the Appelquist, Cheng and Dobrescu (ACD) model with one universal extra dimension. Together with our previous calculation of Z0 penguin diagrams (See http://arxiv.org/abs/hep-ph/0212143) this allows to study the impact of the KK modes on the decays B -> Xs gamma, B -> Xs gluon, B -> Xs mu+ mu- and KL -> pi0 e+ e- and on the CP-violating ratio epsilon'/epsilon. For the compactification scale 1/R= 300 GeV the perturbative part of the branching ratio for B -> Xs mu+ mu- is enhanced by 12 % while the zero in the AFB asymmetry is shifted from s0=0.162 to s0=0.142. The sizable suppressions of Br(B -> Xs gamma) ~ 20 % and Br(B -> Xs gluon) ~ 40 % could have interesting phenomenological implications on the lower bound on 1/R provided the experimental and theoretical uncertainties will be decreased. Similar comments apply to epsilon'/epsilon that is suppressed relative to the Standard Model expectations with the size of the suppression depending sensitively on the hadronic matrix elements. The impact on KL -> pi0 e+ e- is below 10 %. We point out a correlation between the zero s0 in the AFB asymmetry and Br(B -> Xs gamma) that should be valid in most models with minimal flavour violation.
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