Electromagnetic suppression of the decay mu --> e+gamma
High Energy Physics - Phenomenology
2008-11-26 v2
Abstract
Due to large QED anomalous dimensions of the electric and magnetic dipole operators, the rate of the rare muon decay mu --> e+gamma is suppressed by the factor [ 1- 8 alpha/pi ln(Lambda/m_mu) ], independent of the physics responsible for the lepton-flavor violation, except for the scale Lambda at which it occurs. For Lambda = 100 -- 1000 GeV, the resulting decrease of the rate amounts to about 12 -- 17 %.
Cite
@article{arxiv.hep-ph/0106237,
title = {Electromagnetic suppression of the decay mu --> e+gamma},
author = {Andrzej Czarnecki and Ernest Jankowski},
journal= {arXiv preprint arXiv:hep-ph/0106237},
year = {2008}
}
Comments
Added analysis of four-fermion operators. Journal version