Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-09-25
Nucl.Phys.B649:189-204,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages with 2 figures. Figures for \tau -> \mu \gamma decay corrected after typo found in the program. Decay \mu -> e gamma
Scientific paper
10.1016/S0550-3213(02)01031-3
That $\mu \to e, \gamma$ and $\tau \to \mu,\gamma$ are sensitive probes of SUSY models with a see-saw mechanism is a well accepted fact. Here we propose a `top-down' approach in a general SUSY SO(10) scheme. In this framework, we show that at least one of the neutrino Yukawa couplings is as large as the top Yukawa coupling. This leads to a strong enhancement of these leptonic flavour changing decay rates. We examine two `extreme' cases, where the lepton mixing angles in the neutrino Yukawa couplings are either small (CKM-like) or large (PMNS-like). In these two cases, we quantify the sensitivity of leptonic radiative decays to the SUSY mass spectrum. In the PMNS case, we find that the ongoing experiments at the B-factories can completely probe the spectrum up to gaugino masses of 500 GeV (any tan $\beta$). Even in the case of CKM-like mixings, large regions of the parameter space will be probed in the near future, making these two processes leading candidates for indirect SUSY searches.
Masiero Antonio
Vempati Sudhir K.
Vives Oscar
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