Abstract
In this paper we consider an $S^{1}/\mathbb{Z}_2$ compactified flat extra dimensional scenario where all the standard model states can access the bulk and have generalised brane localised kinetic terms. The flavour structure of brane kinetic terms for the standard model fermions are dictated by stringent flavour bounds on the first two generations implying an $U(2)_{Q_L} \otimes U(2)_{u_R} \otimes U(2)_{d_R}$ flavour symmetry. We consider the constraints on such a scenario arising from dark matter relic density and direct detection measurements, precision electroweak data, Higgs physics and LHC dilepton searches. We discuss the possibility of such a scenario providing an explanation of the recently measured anomaly in $R_{K^{(\ast)}}$ within the allowed region of the parameter space.
Highlights
Universal extra dimension (UED) [1,2,3] as an extension of the standard model (SM) of particle physics has received considerable attention in the literature, see [4] and references therein
Taking a cue from some recent hints about flavor violation beyond the SM in B meson decays [32], in this paper we explore a possible extension of this setup while imposing an Uð2ÞQL ⊗ Uð2ÞuR ⊗ Uð2ÞdR flavor symmetry on the brane localized kinetic terms (BLKT) parameters
The nonminimal UED models (nmUED) contribution of higher KK mode W-bosons in the b → c process, and in RDðÃÞ, is quite small which is evident from the Fig. 3 where not much deviation is found in RDðÃÞ even after considering BLKT values up to 20
Summary
Universal extra dimension (UED) [1,2,3] as an extension of the standard model (SM) of particle physics has received considerable attention in the literature, see [4] and references therein. Taking a cue from some recent hints about flavor violation beyond the SM in B meson decays [32], in this paper we explore a possible extension of this setup while imposing an Uð2ÞQL ⊗ Uð2ÞuR ⊗ Uð2ÞdR flavor symmetry on the BLKT parameters This ensures the absence of tree level FCNC mediated by SM gauge bosons in the first two generations of the quark sector. The non-observation of any hint of new physics at the Large Hadron Collider (LHC) either in direct searches for resonances [34,35] or in the increasingly SM like Higgs couplings [36] has been pushing the scale of new physics ever higher This leads to tension with the upper limit on the scale of the extra dimension coming from the overclosure bound for dark matter relic density.
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