Speaker
Description
We study the two-component boosted dark matter (DM) scenario in a neutrinophilic two-Higgs doublet model (ν2HDM), which comprises one extra Higgs doublet with a MeV scale CP-even scalar H. This model is extended with a light (∼ 10 MeV) singlet scalar DM ϕ3, which is stabilized under the existing Z2 symmetry and can only effectively annihilate through scalar H. As the presence of a light H modifies the oblique parameters to put tight constraints on the model, the introduction of vectorlike leptons (VLL) can potentially salvage the issue. These additional vector-like doublet N and one vector-like singlet χ are also stabilized through the Z2 symmetry. The lightest vectorlike mass eigenstate χ1 (∼ 100 GeV) can be the potential second DM component of the model. Individual scalar and fermionic DM candidates have Higgs/Z mediated annihilation, restricting the fermion DM in a narrow mass region while a somewhat broader mass region is allowed for the scalar DM. In a coupled scenario, light DM ϕ3 gets its boost from the χ1 annihilation while the fermionic DM opens up a new annihilation channel χ1χ1 → ϕ3ϕ3: decreasing the relic density. This paves the way for more fermionic DM mass with an under-abundant relic, a region of [35-60] GeV compared to a smaller [40-50] GeV window for the single component fermion DM. On the other hand, the ϕ3 resonant annihilation gets diluted due to boosting effects in kinematics, which increases the DM relic leading to a smaller allowed region. To achieve an under-abundant relic, the total DM relic will be dominated by the χ1 contribution. While there is a region with ϕ3 contribution dominating the total DM, the combined relic becomes over-abundant. Therefore, a sub-dominant (∼ 5%) boosted scalar is the most favorable light DM candidate to be probed for detection.
| Reference publication/preprint | arxiv number 2310.09349 |
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| Designation | Student |
| Institution | SRM University AP |
