R. Ruiz de Austri

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We re-examine 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 → Xsγ). With the help of a Markov Chain Monte Carlo scanning technique, we vary all relevant parameters simultaneously and derive Bayesian posterior(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 supersymmetric 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)
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 explore the effects of three-loop minimal supersymmetric standard model renormalisation group equation terms and some leading two-loop threshold corrections on gauge and Yukawa unification: each being one loop higher order than current public spectrum calculators. We also explore the effect of the higher order terms (often 2-3 GeV) on the lightest CP(More)
We study in detail the impact of the current uncertainty in nucleon matrix elements on the sensitivity of direct and indirect experimental techniques for dark matter detection. We perform two scans in the framework of the cMSSM: one using recent values of the pion-sigma term obtained from Lattice QCD, and the other using values derived from experimental(More)
We derive the allowed ranges of the spin–independent interaction cross section σSI 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)
After a period of inflationary expansion, the Universe reheated and reached full thermal equilibrium at the reheating temperature TR. In this work we point out that, in the context of effective low-energy supersymmetric models, LHC measurements may allow one to determine TR as a function of the mass of the dark matter particle assumed to be either an axino(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, λi ν̂ c i ĤdĤu. The μ term is generated spontaneously through sneutrino vacuum expectation values, μ = λi〈ν̃ i 〉, once the electroweak symmetry is(More)