Friday, August 24, 2012

1208.4605 (Ulrich Haisch et al.)

The impact of heavy-quark loops on LHC dark matter searches    [PDF]

Ulrich Haisch, Felix Kahlhoefer, James Unwin
If only tree-level processes are included in the analysis, LHC monojet searches give weak constraints on the dark matter-proton scattering cross section arising from the exchange of a new heavy scalar or pseudoscalar mediator with Yukawa-like couplings to quarks. In this letter we calculate the constraints on these interactions from the CMS 5.0/fb and ATLAS 4.7/fb searches for jets with missing energy including the effects of heavy-quark loops. We find that the inclusion of such contributions leads to a dramatic increase in the predicted cross section and therefore a significant improvement of the bounds from LHC searches.
View original: http://arxiv.org/abs/1208.4605

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