216 citations · 954 across the 13 of their papers we have counts for
11 papers · 1 filter
Phantom Higgs from Unparticles
A. Delgado, J. R. Espinosa, J. M. No +1
A renormalizable coupling between the Higgs and a scalar unparticle operator O_U of non-integer dimension d_U < 2 gives rise, after electroweak symmetry breaking, to a mass gap in…
The Higgs as a Portal to Plasmon-like Unparticle Excitations
A. Delgado, J. R. Espinosa, J. M. No +1
A renormalizable coupling between the Higgs and a scalar unparticle operator O_U of non-integer dimension d_U<2 triggers, after electroweak symmetry breaking, an infrared divergent…
Running Spectral Index as a Probe of Physics at High Scales
G. Ballesteros, J. A. Casas, J. R. Espinosa
The WMAP results on the scalar spectral index n and its running with scale, though preliminary, open a very interesting window to physics at very high energies. We address the prob…
Large mixing angles for neutrinos from infrared fixed points
J. A. Casas, J. R. Espinosa, I. Navarro
Radiative amplification of neutrino mixing angles may explain the large values required by solar and atmospheric neutrino oscillations. Implementation of such mechanism in the Stan…
Low-scale supersymmetry breaking: effective description, electroweak breaking and phenomenology
A. Brignole, J. A. Casas, J. R. Espinosa +1
We consider supersymmetric scenarios in which the scale of SUSY breaking is low, sqrt{F}=O(TeV). Instead of studying specific models of this type, e.g. those with extra dimensions…
Neutrinos and Gauge Unification
J. A. Casas, J. R. Espinosa, A. Ibarra +1
The approximate unification of gauge couplings is the best indirect evidence for low-energy supersymmetry, although it is not perfect in its simplest realizations. Given the experi…
General RG Equations for Physical Neutrino Parameters and their Phenomenological Implications
J. A. Casas, J. R. Espinosa, A. Ibarra +1
The neutral leptonic sector of the Standard Model presumably consists of three neutrinos with non-zero Majorana masses with properties further determined by three mixing angles and…
Nearly degenerate neutrinos, Supersymmetry and radiative corrections
J. A. Casas, J. R. Espinosa, A. Ibarra +1
If neutrinos are to play a relevant cosmological role, they must be essentially degenerate with a mass matrix of the bimaximal mixing type. We study this scenario in the MSSM frame…
Naturalness of nearly degenerate neutrinos
J. A. Casas, J. R. Espinosa, A. Ibarra +1
If neutrinos are to play a relevant cosmological role, they must be essentially degenerate. We study whether radiative corrections can or cannot be responsible for the small mass s…
The Higgs mass in the MSSM infrared fixed point scenario
J. A. Casas, J. R. Espinosa, H. E. Haber
In the infrared fixed point (IFP) scenario of the minimal supersymmetric model (MSSM), the top-quark mass and other physical quantities of the low-energy theory are insensitive to…
Dominant Two-Loop Corrections to the MSSM Finite Temperature Effective Potential
J. R. Espinosa
We show that two-loop corrections to the finite temperature effective potential in the MSSM can have a dramatic effect on the strength of the electroweak phase transition, making i…