Tuesday, July 31, 2012

1207.6857 (Kaoru Hagiwara et al.)

Isospin-Violating Dark Matter at the LHC    [PDF]

Kaoru Hagiwara, Danny Marfatia, Toshifumi Yamada
We consider a toy model of dark matter with a gauge singlet Dirac fermion that has contact interactions to quarks that differ for right-handed up and down quarks. This is motivated by the isospin-violating dark matter scenario that was proposed to reconcile reported hints of direct dark matter detection with bounds from non-observation of the signal in other experiments. We discuss how the effects of isospin violation in these couplings can be observed at the LHC. By studying events with large missing transverse momentum, we show that the ratio of mono-photon and mono-jet events is sensitive to the difference in the absolute values of the couplings to the up and down quarks, while a dedicated study of di-jet plus missing transverse momentum events can reveal their relative sign. Our methods have broad applicability to new physics that involves unequal couplings to up and down quarks.
View original: http://arxiv.org/abs/1207.6857

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