Bottom-up reconstruction scenarios for (un)constrained MSSM parameters at the CERN LHC Auteur(s): Kneur J.-L., Sahoury Nada (Article) Publié: Physical Review D, vol. 79 p.075010 (2009) Texte intégral en Openaccess : Ref HAL: hal-00319152_v1 Ref Arxiv: 0808.0144 DOI: 10.1103/PhysRevD.79.075010 WoS: 000266408300074 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 14 Citations Résumé: We consider some specific inverse problem or "bottom-up" reconstruction strategies at the CERN LHC for both general and constrained minimal supersymmetric standard model (MSSM) parameters, starting from a plausibly limited set of sparticle identification and mass measurements, using mainly gluino/squark cascade decays, plus eventually the lightest Higgs boson mass. For the three naturally separated sectors of gaugino/Higgsino, squark/slepton, and Higgs parameters, we examine different step-by-step algorithms based on rather simple, entirely analytical, inverted relations between masses and basic MSSM parameters. This includes also reasonably good approximations of some of the relevant radiative correction calculations. We distinguish the constraints obtained for a general MSSM from those obtained with universality assumptions in the three different sectors. Our results are compared at different stages with the determination from more standard "top-down" fit of models to data, and finally combined into a global determination of all the relevant parameters. Our approach gives complementary information to more conventional analysis, and is not restricted to the specific LHC measurement specificities. In addition, the bottom-up renormalization group evolution of general MSSM parameters, being an important ingredient in this framework, is illustrated as a new publicly available option of the MSSM spectrum calculation code Commentaires: 36 PP. |