Renato M. Fonseca
Spanish National Research Council
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Featured researches published by Renato M. Fonseca.
Journal of High Energy Physics | 2014
Renato M. Fonseca; W. Grimus
A bstractAssuming that neutrinos are Majorana particles, we perform a complete classification of all possible mixing matrices which are fully determined by residual symmetries in the charged-lepton and neutrino mass matrices. The classification is based on the assumption that the residual symmetries originate from a finite flavour symmetry group. The mathematical tools which allow us to accomplish this classification are theorems on sums of roots of unity. We find 17 sporadic cases plus one infinite series of mixing matrices associated with three-flavour mixing, all of which have already been discussed in the literature. Only the infinite series contains mixing matrices which are compatible with the data at the 3 sigma level.
Physical Review D | 2015
Sofiane M. Boucenna; Felix Gonzalez-Canales; Renato M. Fonseca; J.W.F. Valle
The physics responsible for gauge coupling unification may also induce small neutrino masses. We propose a novel gauge mediated radiative seesaw mechanism for calculable neutrino masses. These arise from quantum corrections mediated by new
Physical Review D | 2015
Cesar Bonilla; Renato M. Fonseca; J.W.F. Valle
SU(3)_c \times SU(2)_L \times U(1)_X
Physics Letters B | 2016
Cesar Bonilla; Renato M. Fonseca; J.W.F. Valle
(3-3-1) gauge bosons and the physics driving gauge coupling unification. Gauge couplings unify for a 3-3-1 scale in the TeV range, making the model directly testable at the LHC.
Physical Review D | 2013
Carolina Arbeláez; Renato M. Fonseca; J. C. Romao; Martin S. Hirsch
Adding a scalar triplet to the Standard Model is one of the simplest ways of giving mass to neutrinos, providing at the same time a mechanism to stabilize the theory’s vacuum. In this paper, we revisit these aspects of the type-II seesaw model pointing out that the boundedfrom-below conditions for the scalar potential in use in the literature are not correct. We discuss some scenarios where the correction can be significant and sketch the typical scalar boson profile expected by consistency.
Physical Review D | 2016
Renato M. Fonseca; Martin Hirsch
Abstract The vacuum of the Standard Model is known to be unstable for the measured values of the top and Higgs masses. Here we show how vacuum stability can be achieved naturally if lepton number is violated spontaneously at the TeV scale. More precise Higgs measurements in the next LHC run should provide a crucial test of our symmetry breaking scenario. In addition, these schemes typically lead to enhanced rates for processes involving lepton flavor violation.
Journal of High Energy Physics | 2016
Renato M. Fonseca; Martin Hirsch
This work has been supported in part by EU Network Grant No. UNILHC PITN-GA-2009-237920. M. H. also acknowledges support from the Spanish MICINN Grants No. FPA2011-22975, No. MULTIDARK CSD2009-00064 and by the Generalitat Valenciana Grant No. Prometeo/2009/091. The work of R. M. F has been supported by Fundacao para a Ciencia e a Tecnologia through the fellowship SFRH/BD/47795/2008. R. M. F. and J. C. R. also acknowledge the financial support from Grants No. CFTP-FCT UNIT 777, No. CERN/FP/123580/2011 and No. PTDC/FIS/102120/2008.
Nuclear Physics | 2015
Renato M. Fonseca
Different models based on the extended
Physical Review D | 2015
Renato M. Fonseca; Martin S. Hirsch
SU(3{)}_{C}\ifmmode\times\else\texttimes\fi{}SU(3{)}_{L}\ifmmode\times\else\texttimes\fi{}U(1{)}_{X}
arXiv: High Energy Physics - Phenomenology | 2017
Renato M. Fonseca
(331) gauge group have been proposed over the past four decades. Yet, despite being an active research topic, the status of lepton number in 331 models has not been fully addressed in the literature, and furthermore many of the original proposals can not explain the observed neutrino masses. In this paper we review the basic features of various 331 models, focusing on potential sources of lepton number violation. We then describe different modifications which can be made to the original models in order to accommodate neutrino (and charged lepton) masses.