@misc{10481/59405,
year = {2019},
url = {http://hdl.handle.net/10481/59405},
abstract = {We have revisited the computations of the flavor
violating leptonic decays of the τ and μ leptons into three
lighter charged leptons in the Standard Model with massive
neutrinos. We were driven by a claimed unnaturally large
branching ratio predicted for the τ
− → μ
−
l
+
l
− (l = μ, e)
decays (Pham, Eur Phys J C 8:513 1999), which was at odds
with the corresponding predictions for the μ
− → e−e−e+
processes (Petcov, Sov J Nucl Phys 25:340 1977). In contrast
with the prediction in [17], our results are strongly suppressed
and in good agreement with the approximationmade
in Ref. [15], where masses and momenta of the external particles
were neglected in order to deal with the loop integrals.
However -as a result of keeping external momenta and
masses in the computation of the dominant penguin and box
diagrams- we even find slightly smaller branching fractions.
Therefore, we confirm that any future observation of such
processes would be an unambiguous manifestation of new
physics beyond the Standard Model.},
organization = {Finally, we also
acknowledge support from Conacyt through projects FOINS-296-2016
(Fronteras de la Ciencia), and 236394 and 250628 (Ciencia Básica).},
publisher = {Springer Nature},
title = {Flavor violating leptonic decays of τ and μ leptons in the Standard Model with massive neutrinos},
doi = {10.1140/epjc/s10052-019-6563-4},
author = {Hernández Tomé, G. and López Castro, Gabriel and Roig, P.},
}