Minimal Two-component Scalar Doublet Dark Matter with Radiative Neutrino Mass

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 ${\mathbb{Z}}_2\times {\mathbb{Z}}_2^{\prime }$ 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: $M_W\le M_{\mathrm{DM}}\lesssim 500\mathrm{GeV}$, where one scalar doublet DM can not satisfy correct relic, we show that this entire range becomes allowed within this two-component scalar doublet DM, thanks to the inter-conversion between the two DM candidates in presence of neutrino Yukawa couplings with dark sector.

33 pages, 13 figures, matches version accepted by Physical Review D

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