Abstract
We propose a minimal extension of the Standard Model to accommodate two-component dark matter (DM) and light neutrino mass. The symmetry of the Standard Model is enhanced by an unbroken ${\mathbb{Z}}_{2}\ifmmode\times\else\texttimes\fi{}{\mathbb{Z}}_{2}^{\ensuremath{'}}$ such that being odd under each ${\mathbb{Z}}_{2}$, there exists one right-handed neutrino and one inert scalar doublet. Therefore, each of the ${\mathbb{Z}}_{2}$ sectors contribute to (i) light neutrino masses radiatively similar to the scotogenic models while (ii) the two neutral $CP$ even scalars present in two additional inert doublets play the role of dark matters. Focusing on the intermediate range of inert scalar doublet DM scenario: ${M}_{W}\ensuremath{\le}{M}_{\mathrm{DM}}\ensuremath{\lesssim}\phantom{\rule{0ex}{0ex}}500\text{ }\text{ }\mathrm{GeV}$, where one scalar doublet DM cannot satisfy correct relic, we show that this entire range becomes allowed within this two-component scalar doublet DM, thanks to the interconversion between the two DM candidates in the presence of neutrino Yukawa couplings with dark sector.
Highlights
There have been irrefutable amount of evidences in favor of the existence of nonluminous, nonbaryonic form of matter in the universe, popularly known as dark matter (DM)
While in the single component DM framework, this intermediate region can be revived by additional production mechanisms [103,123], there still exists severe bounds from indirect detection experiments which effectively rule out single scalar doublet DM mass below around 400 GeV [103]
Since the intermediate mass region is special in the sense that one component scalar doublet DM is not enough to produce correct relic density, we stick to that mass range for our numerical analysis
Summary
There have been irrefutable amount of evidences in favor of the existence of nonluminous, nonbaryonic form of matter in the universe, popularly known as dark matter (DM). We adopt a similar setup here while sticking to the most minimal scenario in order to accommodate two component scalar doublet DM with correct total relic abundance, satisfying the neutrino oscillation data and other relevant constraints from dark matter direct, indirect detections and lepton flavor violation (LFV). There exists the possibility of singlet fermion DM in either or both the Z2 sectors, we stick to scalar doublet DM The reason behind this choice is threefold: (a) the gauge interactions of DM due to which the correct thermal abundance can be obtained without requiring large dimensionless couplings to enhance annihilation cross section, (b) the gauge interactions of scalar doublet DM enhance its detection prospects at direct, indirect search experiments, (c) there exists an intermediate region for single component scalar doublet DM where relic abundance criteria cannot be satisfied which makes it worth studying if two component scalar doublet DM can fill the void.
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