Oct 23 – 27, 2017
America/Argentina/Buenos_Aires timezone

LFV Higgs decays in low-scale seesaw models within the mass insertion approximation

Oct 24, 2017, 4:00 PM


ICAS Campus Miguelete, 25 de Mayo y Francia. C.P.: 1650. San Martín, Provincia de Buenos Aires, Argentina.


Roberto Morales (UNLP)


In this talk I present a new computation of the Lepton Flavor Violating
Higgs decays that are generated radiatively to one-loop from heavy
right-handed neutrinos. We work within the context of the Inverse Seesaw
model with three right-handed neutrinos and three extra singlets, but the
results could be generalized to other Low Scale Seesaw models. The novelty
of our computation is that it uses a completely different method by means
of the Mass Insertion Approximation which works with the electroweak
interaction states instead of the usual 9 physical neutrino mass
eigenstates of the Inverse Seesaw model. This method also allows us to
write the analytical results explicitly in terms of the most relevant
model parameters, that are the neutrino Yukawa coupling matrix and the
right-handed mass matrix, which is very convenient for a phenomenological
We also study numerically the goodness of the Mass Insertion Approximation
results. In the last part we present the computation of the relevant
one-loop effective vertex for the Lepton Flavor Violating Higgs decay
which is derived from a large right-handed neutrino mass expansion of the
form factors. We believe that our simple formula found for this effective
vertex can be of interest for other researchers who wish to estimate the
corresponding rates in a fast way in terms of their own preferred input
values for the relevant model parameters.

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