Next-to-minimal dark matter at the LHC

Next-to-minimal dark matter at the LHC

Blog Article

Abstract We examine the collider signatures of a WIMP dark matter scenario comprising a singlet fermion and an SU(2) n-plet fermion, with a focus on n = 3 and n = 5.The singlet and n-plet masses are of the order of the electroweak scale.The n-plet contains new charged particles which here will be copiously pair-produced at the LHC.Small mixing angles and near-degenerate masses, both of which feature naturally in these models, give rise to long-lived particles and their characteristic collider signatures.

In particular, the n = 5 model can be constrained by displaced lepton searches independently of the mixing angle, generically ruling out 5-plet masses below about 280 GeV.For small mixing angles, we show that there is a parameter range for which the model reproduces the observed thermal relic density but is severely constrained by disappearing us polo assn mens sweaters track searches in both the n = 3 and the n = 5 cases.The n = 3 model is further constrained by soft di-lepton searches irrespective of whether any of the new particles are long-lived.