Light dark matter through assisted annihilation

In this paper we investigate light dark matter scenarios where annihilation to Standard Model particles at tree-level is kinematically forbidden. In such cases annihilation can be aided by massive Standard Model-like species, called assisters , in the initial state that enhances the available phase...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2017-03, Vol.2017 (3), p.45-45
Main Authors: Dey, Ujjal Kumar, Maity, Tarak Nath, Ray, Tirtha Sankar
Format: Article
Language:English
Subjects:
ANNIHILATION
DENSITY
KEV RANGE
MEV RANGE
NONLUMINOUS MATTER
PHASE SPACE
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
STANDARD MODEL
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Summary:In this paper we investigate light dark matter scenarios where annihilation to Standard Model particles at tree-level is kinematically forbidden. In such cases annihilation can be aided by massive Standard Model-like species, called assisters , in the initial state that enhances the available phase space opening up novel tree-level processes. We investigate the feasibility of such non-standard assisted annihilation processes to reproduce the observed relic density of dark matter. We present a simple scalar dark matter-scalar assister model where this is realised. We find that if the dark matter and assister are relatively degenerate the required relic density can be achieved for a keV-MeV scale dark matter. We briefly discuss the cosmological constraints on such dark matter scenarios.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2017/03/045