Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-03-21
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 2 figures, to appear in the Annual report of Tbilisi State University
Scientific paper
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 $B_{s,d}\to\gamma\gamma$ rate and find an enhancement of 3% and 6%, respectively, over the SM prediction.
Bigi Ikaros I.
Chiladze George
Devidze Gela
Hanhart Christoph
Lipartelian Akaki
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