Antiproton constraints on dark matter annihilations from internal electroweak bremsstrahlung

If the dark matter particle is a Majorana fermion, annihilations into two fermions and one gauge boson could have, for some choices of the parameters of the model, a non-negligible cross-section. Using a toy model of leptophilic dark matter, we calculate the constraints on the annihilation cross-sec...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2011-07, Vol.2011 (7), p.28-28
Main Authors: Garny, Mathias, Ibarra, Alejandro, Vogl, Stefan
Format: Article
Language:English
Subjects:
ANNIHILATION
ANTIPROTONS
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BOSONS
BREMSSTRAHLUNG
CROSS SECTIONS
ELECTRONS
GAMMA RADIATION
LIMITING VALUES
MILKY WAY
NONLUMINOUS MATTER
QUARKS
UNIVERSE
VISIBLE RADIATION
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Summary:If the dark matter particle is a Majorana fermion, annihilations into two fermions and one gauge boson could have, for some choices of the parameters of the model, a non-negligible cross-section. Using a toy model of leptophilic dark matter, we calculate the constraints on the annihilation cross-section into two electrons and one weak gauge boson from the PAMELA measurements of the cosmic antiproton-to-proton flux ratio. Furthermore, we calculate the maximal astrophysical boost factor allowed in the Milky Way under the assumption that the leptophilic dark matter particle is the dominant component of dark matter in our Universe. These constraints constitute very conservative estimates on the boost factor for more realistic models where the dark matter particle also couples to quarks and weak gauge bosons, such as the lightest neutralino which we also analyze for some concrete benchmark points. The limits on the astrophysical boost factors presented here could be used to evaluate the prospects to detect a gamma-ray signal from dark matter annihilations at currently operating IACTs as well as in the projected CTA.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2011/07/028