%0 Unpublished work
%T Next-to-minimal dark matter at the LHC
%+ Centre de Physique Théorique - UMR 7332 (CPT)
%+ CPT - E1 Physique des particules
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%+ Laboratoire Charles Coulomb (L2C)
%A Bharucha, Aoife
%A BRÜMMER, Felix
%A DESAI, Nishita
%Z 16 pages, 5 figures
%8 2018-04-16
%D 2018
%Z 1804.02357
%Z Physics [physics]
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]Preprints, Working Papers, ...
%X 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 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 track searches in both the n=3 and the n=5 cases. The n=3 model is further constrained by soft di-lepton searches irrespectively of whether any new particles are long-lived.
%G English
%L hal-01767365
%U https://hal.archives-ouvertes.fr/hal-01767365
%~ CNRS
%~ UNIV-TLN
%~ L2C
%~ UNIV-AMU
%~ CPT
%~ IN2P3
%~ MIPS
%~ UNIV-MONTPELLIER
%~ TEST-AMU
%~ CPT-PARTICULES
%~ LUPM