2006/03/21 by Ikaros I. Bigi, Bigi, Ikaros I., George Chiladze +9
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0603160
15 pages, 2 figures, to appear in the Annual report of Tbilisi State University
arxiv created 2006/03/21 · arxiv updated 2009/12/01
This paper addresses the role of Large Extra Dimensions in some flavor changing neutral current (FCNC) driven processes. In particular we have investigated radiative decays of charged leptons within models with only one universal extra dimension (UED). Loop contributions with internal fermions and scalars of comparable mass would seem to yield sizeable amplitudes, since the generic quadratic suppression factor is changed into a linear one. Such scenarios can in principle be realized in models with universal extra space dimensions. Yet our calculations of the Kaluza-Klein (KK) contributions to these radiative decays show this expected relative enhancement to disappear due to the near mass degeneracy of the heavy neutrinos from the different generations. In this paper we estimate also the UED contribution to the Bs,d→γγ rate and find an enhancement of 3% and 6%, respectively, over the SM prediction.