Abstract
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 Higgs-sfermion 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 × 10−16, thus satisfying limits from big bang nucleosynthesis even for large stau lifetimes.
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Heisig, J., Kersten, J., Panes, B. et al. A survey for low stau yields in the MSSM. J. High Energ. Phys. 2014, 53 (2014). https://doi.org/10.1007/JHEP04(2014)053
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DOI: https://doi.org/10.1007/JHEP04(2014)053