378 citations
- Instituto Superior TécnicoPT38 papers
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18 papers · 1 filter
Is S4 the horizontal symmetry of tri-bimaximal lepton mixing?
W. Grimus, L. Lavoura, P. O. Ludl
We determine the symmetry groups under which the charged-lepton and the Majorana-neutrino mass terms are invariant. We note that those two groups always exist trivially, i.e. indep…
Resonant leptogenesis and tribimaximal leptonic mixing with A4 symmetry
G. C. Branco, R. Gonzalez Felipe, M. N. Rebelo +1
We investigate the viability of thermal leptogenesis in type-I seesaw models with leptonic flavour symmetries that lead to tribimaximal neutrino mixing. We consider an effective th…
Coupling dark energy with Standard Model states
M. C. Bento, A. E. Bernardini, O. Bertolami
In this contribution one examines the coupling of dark energy to the gauge fields, to neutrinos, and to the Higgs field. In the first case, one shows how a putative evolution of th…
Bounds on scalar masses in two Higgs doublet models
P. M. Ferreira, D. R. T. Jones
A thorough analysis of stability and perturbativity bounds is performed in several versions of the two-Higgs doublet model, for both CP-conserving and spontaneously broken CP minim…
Tri-bi-maximal mixing in viable family symmetry unified model with extended seesaw
Federica Bazzocchi, Ivo de Medeiros Varzielas
We present a Grand Unified model based on SO(10) with a Delta(27) family symmetry. Fermion masses and mixings are fitted and agree well with experimental values. An extended seesaw…
Long-Lived Slepton in the Coannihilation Region and Measurement of Lepton Flavour Violation at LHC
S. Kaneko, J. Sato, T. Shimomura +2
When the mass difference between the lightest slepton and the lightest neutralino is smaller than the tau mass, the lifetime of the lightest slepton in the constrained Minimal Supe…