Two-singlet model for light cold dark matter

Abstract

We extend the Standard Model by adding two gauge-singlet Z 2 -symmetric scalar fields that interact with visible matter only through the Higgs particle. One is a stable dark matter WIMP, and the other one undergoes a spontaneous breaking of the symmetry that opens new channels for the dark matter annihilation, hence lowering the mass of the WIMP. We study the effects of the observed dark matter relic abundance on the annihilation cross section and find that in most regions of the parameters space, light dark matter is viable. We also compare the elastic scattering cross-section of our dark matter candidate off nucleus with existing (CDMSII and XENON100) and projected (SuperCDMS and XENON1T) experimental exclusion bounds. We find that most of the allowed mass range for light dark matter will be probed by the projected sensitivity of XENON1T experiment. PACS numbers: 95.35.+d; 11.30.Qc.

Modeling Light Cold Dark Matter

“…We have analysed the decay of the meson B s into a pair of µ + µ − and saw how this could constrain significantly the S 1 mass and the S 1 − Higgs mixing angle θ . Other processes can be envisaged, and further constraints should be expected (abada & Nasri, 2011). Implications on the Higgs detection through the measurable channels should also be considered as current experimental bounds from LEP II data can be used to constrain the mixing angle θ and possibly other parameters.…”

“…Here too, all this mass range will be probed by the XENON1T experiment, except a sharp dip at m 0 = m 1 /2 = 2.5GeV, but for such a very light mass, the experimental results are not without ambiguity. Reversely, increasing m 1 shuts down possibilities for very light dark matter and thins the intervals as it drives the predicted masses to larger values Abada (2011). …”

“…For example, in this model, we can use (18) to obtain the mutual coupling constant η 01 are perturbative, all the other physical coupling constants will be. The dark-matter annihilation cross sections (times the relative speed) through all possible channels within the model can be calculated in the usual manner to lowest order in perturbation theory Abada (2011). The quantity v 12 σ ann is the sum of all these contributions.…”

“…The aim is to use this example as a generic prototype in order to show how modeling of cold dark matter can be done and what are the main steps to follow. Most of the technical material used here is drawn from (Abada, 2011). This chapter is organized as follows.…”

Constraining the Parameters of a Model for Cold Dark Matter

“…The discussion is based on a model proposed in Ref. [31] for cold dark matter, exposed to particle-physics phenomenology in [32], and further restricted by internal consistency in Ref. [33].…”