Marco Aurelio Diaz

Minimal supergravity with R-parity breaking

We show that the minimal R-parity breaking model characterized by an effective bilinear violation of R-parity in the superpotential is consistent with minimal N = 1 supergravity unification with radiative breaking of the electroweak symmetry and universal scalar and gaugino masses. This one-parameter extension of the MSSM-SUGRA model provides therefore the simplest reference model for the breaking of R-parity and constitutes a consistent truncation of the complete dynamical models with spontaneous R-parity breaking proposed previously. We comment on the lowest-lying CP-even Higgs boson mass and discuss its minimal N = 1 supergravity limit, determine the ranges of tanβ and bottom quark Yukawa couplings allowed in the model, as well as the relation between the tau neutrino mass and the bilinear R-parity violating parameter.

A Supersymmetric solution to the solar and atmospheric neutrino problems

The simplest unified extension of the Minimal Supersymmetric Standard Model with bi-linear R--Parity violation provides a predictive scheme for neutrino masses which can account for the observed atmospheric and solar neutrino anomalies in terms of bi-maximal neutrino mixing. The maximality of the atmospheric mixing angle arises dynamically, by minimizing the scalar potential, while the solar neutrino problem can be accounted for either by large or by small mixing oscillations. One neutrino picks up mass by mixing with neutralinos, while the degeneracy and masslessness of the other two is lifted only by loop corrections. Despite the smallness of neutrino masses R-parity violation is observable at present and future high-energy colliders, providing an unambiguous cross-check of the model.

Superparticle mass spectra from SO ( 10 ) grand unified models with Yukawa coupling unification

We examine the spectrum of superparticles obtained from the minimal

Impact of physical principles at very high-energy scales on the superparticle mass spectrum

\mathrm{SO}(10)

Charged Higgs boson and stau phenomenology in the simplest R-parity breaking model

grand unified model, where it is assumed the gauge symmetry breaking yields the minimal supersymmetric standard model (MSSM) as the effective theory at

Gauge and Yukawa unification with broken R-parity

{M}_{\mathrm{GUT}}\ensuremath{\sim}2\ifmmode\times\else\texttimes\fi{}{10}^{16}

Can we distinguish between h(SM) and h0 in split supersymmetry

GeV. In this model, unification of Yukawa couplings implies a value of

Charged Higgs mass bounds from b → sγ in a bilinear R-parity violating model

\mathrm{tan}\ensuremath{\beta}\ensuremath{\sim}45\char21{}55.

Gravitino dark matter and neutrino masses in partial split supersymmetry

At such high values of

Anomaly mediated supersymmetry breaking without R parity

\mathrm{tan}\ensuremath{\beta},