%0 Journal Article
%T Next-to-minimal dark matter at the LHC
%+ Centre de Physique Théorique - UMR 7332 (CPT)
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%A Bharucha, Aoife
%A Brümmer, Felix
%A Desai, Nishita
%Z Labex OCEVU
%Z 16 pages, 5 figures
%< avec comité de lecture
%@ 1126-6708
%J Journal of High Energy Physics
%I Springer
%V 2018
%N 11
%P 195
%8 2018-11-29
%D 2018
%Z 1804.02357
%R 10.1007/JHEP11(2018)195
%K Beyond Standard Model
%K Effective Field Theories
%Z Physics [physics]
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]Journal articles
%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
%2 https://hal.science/hal-01767365/document
%2 https://hal.science/hal-01767365/file/Bharucha2018_Article_Next-to-minimalDarkMatterAtThe.pdf
%L hal-01767365
%U https://hal.science/hal-01767365
%~ IN2P3
%~ UNIV-TLN
%~ CNRS
%~ UNIV-AMU
%~ CPT
%~ LUPM
%~ UNIV-MONTPELLIER
%~ AMIDEX
%~ LUPM_IFAC
%~ ANR
%~ UM-2015-2021