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Abstract: After reviewing the theoretical, phenomenological and experimentalmotivations for supersymmetric extensions of the Standard Model, we recall thatsupersymmetric relics from the Big Bang are expected in models that conserve Rparity. We then discuss possible supersymmetric dark matter candidates,focusing on the lightest neutralino and the gravitino. In the latter case, thenext-to-lightest supersymmetric particle is expected to be long-lived, andpossible candidates include spartners of the tau lepton, top quark andneutrino. We then discuss the roles of the renormalization-group equations andelectroweak symmetry breaking in delimiting the supersymmetric parameter space.We discuss in particular the constrained minimal extension of the StandardModel CMSSM, in which the supersymmetry-breaking parameters are assumed to beuniversal at the grand unification scale, presenting predictions from afrequentist analysis of its parameter space. We also discuss astrophysical andcosmological constraints on gravitino dark matter models, as well as theparameter space of minimal supergravity mSUGRA models in which there areextra relations between the trilinear and bilinear supersymmetry-breakingparameters, and between the gravitino and scalar masses. Finally, we discussmodels with non-universal supersymmetry-breaking contributions to Higgs masses,and models in which the supersymmetry-breaking parameters are universal at somescale below that of grand unification.this http URL



Autor: John Ellis, Keith A. Olive

Fuente: https://arxiv.org/







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