A survey for low stau yields in the MSSM

作者：Heisig Jan^*; Kersten Joern; Panes Boris; Robens Tania

来源：The Journal of High Energy Physics, 2014, 2014(4): 053.

DOI：10.1007/JHEP04(2014)053

• Supersymmetry Phenomenology

We study the implications of LHC results for the abundance of long-lived staus after freeze-out from thermal equilibrium in a super-WIMP dark matter scenario. We classify regions in the MSSM parameter space according to the stau yield, considering all possible co-annihilation effects as well as the effects of resonances and large Higgssfermion couplings. Afterwards, we examine the viability of these regions after imposing experimental and theoretical constraints, in particular a Higgs mass around 125 GeV and null-searches for heavy stable charged particles (HSCP) at the LHC. We work in a pMSSM framework and perform a Monte Carlo scan over the parameter space. To interpret the HSCP searches in our scenario, we consider all potentially important superparticle production processes, developing a fast estimator for NLO cross sections for electroweak and strong production at the LHC. After applying all constraints, we find that stau yields below 10(-14) occur only for resonant annihilation via a heavy Higgs in combination with either co-annihilation or large left-right stau mixing. We encounter allowed points with yields as low as 2 x 10(-16), thus satisfying limits from big bang nucleosynthesis even for large stau lifetimes.

• 出版日期2014-4-8