Monojet events at colliders have been used to probe models of dark matter andextra dimensions. We point out that these events also probe extensions of theStandard Model modifying neutrino-quark interactions. Such nonstandardinteractions (NSI) have been discussed in connection with neutrino oscillationexperiments. Assuming first that NSI remain contact at LHC energies, we derivestringent bounds that approach the levels suggested by the Boron-8 solar data.We next explore the possibility that the mediators of the NSI can be producedat colliders. The constraints are found to be strongest for mediator masses inthe 10^2-10^3 GeV range, with the best bounds above ~ 200 GeV coming from ATLASand below from CDF. For mediators with masses below 30 GeV the monojet boundsare weaker than in the contact limit. These results also directly apply tolight dark matter searches. Lastly, we discuss how neutrino NSI can bedistinguished from dark matter or Kaluza-Klein states with charged leptonsearches.
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