Isospin-Violating Dark Matter at the LHC
arXiv:1207.6857 · doi:10.1103/PhysRevD.89.094017
Abstract
We consider a toy model of dark matter (DM) 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 DM 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 ratio of 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. We also consider how our results are modified if instead of a contact interaction, a particle that mediates the interaction is introduced. Our methods have broad applicability to new physics that involves unequal couplings to up and down quarks.
36 pages, 8 figures, 7 tables. Version to appear in PRD
References in corpus (13)
- PYTHIA 6.4 Physics and Manual
- First results from the LUX dark matter experiment at the Sanford Underground Research Facility
- Dark Matter Results from 225 Live Days of XENON100 Data
- First results from DAMA/LIBRA and the combined results with DAMA/NaI
- Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector
- Search for Low-Mass WIMPs with SuperCDMS
- Results from a Low-Energy Analysis of the CDMS II Germanium Data
- Missing Energy Signatures of Dark Matter at the LHC
- Search for Dark Matter and Large Extra Dimensions in pp Collisions Yielding a Photon and Missing Transverse Energy
- Low-threshold analysis of CDMS shallow-site data
- Limits on light WIMPs from the CDEX-1 experiment with a p-type point-contact germanium detector at the China Jingping Underground Laboratory
- Search for New Physics with a Mono-Jet and Missing Transverse Energy in pp Collisions at sqrt(s) = 7 TeV
- Light Dark Matter Anomalies After LUX