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العنوان
Dark matter and cosmological implications of supersymmetric models /
الناشر
Waleed Mohammed Abdallah Mohammed ,
المؤلف
Waleed Mohammed Abdallah Mohammed
تاريخ النشر
2017
عدد الصفحات
107 P. :
الفهرس
Only 14 pages are availabe for public view

from 127

from 127

Abstract

In the context of the minimal supersymmetric standard model (MSSM), we analyse the thermal relic abundance of lightest neutralino, which is the lightest supersym-metric particle (LSP). We show that the combined large hadron collider (LHC) and relic abundance constraints rule out most of the MSSM parameter space except a very narrow region with very large tan Ý ({u223C}50). Within this region, we emphasize that the spin-independent scattering cross section of the LSP with a proton is less than the latest large underground Xenon limit by at least two orders of magni- tude. Also, we argue that non-thermal dark matter (DM) scenario may relax the constraints imposed on the MSSM parameter space. Motivated by a{u223C}3v excess recorded by the CMS experiment at the LHC around a mass of order{u223C}137 GeV in ZZ{u2217}{u2192}4l and ÞÞ samples, we analyse the potential discovery of a second neutral higgs boson in the supersymmetric B-L extension of the standard model (BLSSM) at the CERN machine. We con{uFB01}rm that a double Higgs peak structure can be generated in this framework, with CP-even Higgs boson masses at{u223C}125 GeV and{u223C}137 GeV, unlike the case of the MSSM. In addition we consider the BLSSM with Inverse seesaw, which provides new DM candidates (lightest right-handed sneutrino and lightest B-L neutralino) with mass of order few hundreds GeV. We emphasize that the thermal relic abundance and direct detection experiments via relic neutralino scattering with nuclei impose stringent constraints on the B-L neutralinos. These constraints can be satis{uFB01}ed by few points in the parameter space, which cannot explain the observed galactic center (GC) gamma-ray excess measured by Fermi-LAT. We show that for a wide region of parameter space the lightest right-handed sneutrino can satisfy the limits of the relic abundance, the scattering cross section with nuclei and the observed GC gamma-ray results