2023/10/13 by Basu, Arindam, Chakraborty, Amit, Kumar, Nilanjana +1 · 1 citation
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)
paper · doi:10.48550/arxiv.2310.09349
We study the boosted dark matter (BDM) scenario in a two-component model. We consider a neutrinophilic two-Higgs doublet model (ν2HDM), which consists of one extra Higgs doublet and a light right-handed neutrino. This model is extended with a light (∼ 10~MeV) singlet scalar DM ϕ3, which is stabilized under an extra dark Z2\rm DM symmetry and can only effectively annihilate through the CP even scalar H. Although oblique parameters put tight constraints on the model, introduction of vectorlike leptons (VLL) can potentially salvage the issue. The vectorlike doublet N and singlet χ are also stabilized through dark Z2\rm DM symmetry. The lightest vectorlike mass eigenstate (χ1 ∼ 100~GeV) is the 2nd DM component of the model. The fermion DM is restricted in a narrow mass region while a somewhat broader mass region is allowed for the scalar DM. However, when two DM sectors are coupled, the annihilation channel χ1 χ1 → ϕ3 ϕ3 opens up. As a result, the fermionic relic density decreases, and paves way for broader fermionic DM mass region with under-abundant relic: a region of [30-65] GeV compared to a narrower [40-50] GeV window for the single component case. On the other hand, the light DM ϕ3 acquires significant boost from the annihilation of χ1, causing a dilution in the resonant annihilation of ϕ3. This in turn increases the scalar DM relic, allowing for a smaller mass region compared to the individual case. The exact and underabundant relic is achievable in a significant parameter space of the two-component model where the total DM relic is mainly dominated by the fermionic DM contribution. The scalar DM is found to be sub-dominant or equally dominant (∼ 30 % - 80 % of total DM) with significant boost which can be detected in experiments.