Search for Higgs bosons in SUSY cascades in CMS and dark matter with non-universal gaugino masses

Abstract

In grand-unified theories (GUT), non-universal boundary conditions for the gaugino masses may arise at the unification scale and may affect the observability of the neutral MSSM Higgs bosons (h/H/A) at the LHC. The implications of such non-universal gaugino masses are investigated for Higgs boson production in the SUSY cascade decay chain $\tilde{g}\rightarrow \tilde{q}q$ , $\tilde{q}\rightarrow \tilde{\chi_{2}}q$ , $\tilde{\chi_{2}}\rightarrow \tilde{\chi_{1}}h/H/A$ , $h/H/A\rightarrow b\bar{b}$ produced in pp interactions. In the singlet representation with universal gaugino masses only the light Higgs boson can be produced in this cascade with the parameter region of interest for us, while with non-universal gaugino masses heavy neutral MSSM Higgs boson production may dominate. The allowed parameter space in the light of the WMAP constraints on the cold dark-matter relic density is investigated in the above scenarios for gaugino mass parameters. We also demonstrate that combination of representations can give the required amount of dark matter in any point of the parameter space. In the non-universal case we show that heavy Higgs bosons can be detected in the cascade studied in parameter regions with the WMAP preferred neutralino relic density.