Reviving sub-TeV lepton doublet dark matter

Purusottam Ghosh; Sk Jeesun

doi:10.1140/epjc/s10052-023-12039-z

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 880
https://doi.org/10.1140/epjc/s10052-023-12039-z

Regular Article - Theoretical Physics

Reviving sub-TeV $S U {(2)}_{L}$ lepton doublet dark matter

Purusottam Ghosh^a and Sk Jeesun

School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, 700032, Kolkata, India

^a spspg2655@iacs.res.in

Received: 24 July 2023
Accepted: 12 September 2023
Published online: 29 September 2023

Abstract

In this work we study the hybrid kind of dark matter (DM) production mechanism where both thermal and non-thermal contribution at two different epochs set the DM relic abundance. This hybrid set up in turn shifts the parameter space of DM in contrast to pure thermal DM scenario. We review such production mechanism in the context of the $S U {(2)}_{L}$ $$SU(2)_L$$ lepton doublet dark matter $(Ψ)$ $(\Psi )$ augmented with an additional singlet dark scalar (S). The neutral component of the dark doublet can serve as a stable DM candidate and in pure thermal scenario, it is under-abundant as well as excluded from direct detection constraints due to its strong gauge interactions in the sub-TeV mass regime. However, in addition to the thermal contribution, the late time non-thermal DM production from the decay of the long-lived dark scalar S helps to fulfill the deficit in DM abundance. On the other hand, the strong gauge mediated direct detection constraint can be evaded with the help of a $S U {(2)}_{L}$ $$SU(2)_L$$ triplet scalar(with $Y = 2),$ $$Y=2),$$ resulting a pseudo-Dirac DM. To realize our proposed scenario we impose a discrete $Z_{2}$ ${\mathcal {Z}}_2$ symmetry under which both $Ψ$ $\Psi$ and S are odd while rest of the fields are even. We find the lepton doublet pseudo-Dirac DM with mass $\sim 450 - 1200$ $\sim 450{-}1200$ GeV, compatible with the observed relic density, direct, indirect, and existing collider search constraints.

© The Author(s) 2023

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