https://doi.org/10.1140/epjc/s10052-019-7422-z
Regular Article - Theoretical Physics
Lepton flavor violation and collider searches in a type I + II seesaw model
1
Departamento de Fisica, Universidade Federal do Maranhao, Campus Universitario do Bacanga, São Luís, MA, 65080-805, Brazil
2
International Institute of Physics, Universidade Federal do Rio Grande do Norte, Campus Universitario, Lagoa Nova, Natal, RN, 59078-970, Brazil
3
Departamento de Fisica, Universidade Federal da Paraiba, Caixa Postal 5008, João Pessoa, PB, 58051-970, Brazil
4
Centro Cientifico-Tecnologico de Valparaiso, Universidad Tecnica Federico Santa Maria, Casilla 110-V, Valparaiso, Chile
5
Coordenadoria Interdisciplinar de Ciência e Tecnologia, Universidade Federal do Maranhão, São Luís, Maranhão, 65080-805, Brazil
* e-mail: farinaldo.queiroz@iip.ufrn.br
Received:
24
June
2019
Accepted:
25
October
2019
Published online:
21
November
2019
Neutrinos are massless in the Standard Model. The most popular mechanism to generate neutrino masses are the type I and type II seesaw, where right-handed neutrinos and a scalar triplet are augmented to the Standard Model, respectively. In this work, we discuss a model where a type I + II seesaw mechanism naturally arises via spontaneous symmetry breaking of an enlarged gauge group. Lepton flavor violation is a common feature in such setup and for this reason, we compute the model contribution to the 
and 
decays. Moreover, we explore the connection between the neutrino mass ordering and lepton flavor violation in perspective with the LHC, HL-LHC and HE-LHC sensitivities to the doubly charged scalar stemming from the Higgs triplet. Our results explicitly show the importance of searching for signs of lepton flavor violation in collider and muon decays. The conclusion about which probe yields stronger bounds depends strongly on the mass ordering adopted, the absolute neutrino masses and which much decay one considers. In the 1–5 TeV mass region of the doubly charged scalar, lepton flavor violation experiments and colliders offer orthogonal and complementary probes. Thus if a signal is observed in one of the two new physics searches, the other will be able to assess whether it stems from a seesaw framework.
© The Author(s), 2019
