R. Ruiz de Austri

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We perform a comprehensive exploration of the Constrained MSSM parameter space employing a Markov Chain Monte Carlo technique and a Bayesian analysis. We compute superpart-ner masses and other collider observables, as well as a cold dark matter abundance, and compare them with experimental data. We include uncertainties arising from theoretical(More)
The µνSSM is a supersymmetric standard model that solves the µ problem of the MSSM using the R-parity breaking couplings between the right-handed neutrino superfields and the Higgses in the superpotential, λ i ˆ ν c i ˆ H d ˆ H u. The µ term is generated spontaneously through sneutrino vacuum expectation values, µ = λ i ˜ ν c i , once the electroweak(More)
We use a newly released version of the SuperBayeS code to analyze the impact of the choice of priors and the influence of various constraints on the statistical conclusions for the preferred values of the parameters of the Constrained MSSM. We assess the effect in a Bayesian framework and compare it with an alternative likelihood-based measure of a profile(More)
In the framework of the CMSSM we study the gravitino as the lightest super-symmetric particle and the dominant component of cold dark matter in the Universe. We include both a thermal contribution to its relic abundance from scatterings in the plasma and a non–thermal one from neutralino or stau decays after freeze–out. In general both contributions can be(More)
We reexamine the properties of the Constrained MSSM in light of updated constraints , paying particular attention to the impact of the recent substantial shift in the Standard Model prediction for BR(B → X s γ). With the help of a Markov Chain Monte Carlo scanning technique, we vary all relevant parameters simultaneously and derive Bayesian posterior(More)
We examine the prospects of detecting the light Higgs scalar h 0 of the Constrained MSSM at the Tevatron. To this end we explore large ranges of the CMSSM parameter space with µ > 0 using a Markov Chain Monte Carlo technique, and apply all relevant collider and cosmological constraints including their uncertainties, as well as those of the Standard Model(More)
We derive the allowed ranges of the spin–independent interaction cross section σ SI p for the elastic scattering of neutralinos on proton for wide ranges of parameters of the general Minimal Supersymmetric Standard Model. We investigate the effects of the lower limits on Higgs and superpartner masses from colliders, as well as the impact of constraints from(More)
In the framework of the Constrained MSSM we re–examine the gravitino as the lightest superpartner and a candidate for cold dark matter in the Universe. Unlike in most of other recent studies, we include both a thermal contribution to its relic population from scatterings in the plasma and a non–thermal one from neutralino or stau decays after freeze–out.(More)
We examine the Non-Universal Higgs Model (NUHM) with the help of a Markov Chain Monte Carlo scanning technique and Bayesian statistics. The method allows us to reveal more fully the remarkably rich and complex structure of the model and also some new interesting features. In particular we find that, for large ranges of parameters, the neutralino dark matter(More)