TY - JOUR
T1 - R-parity preserving super-WIMP decays
AU - Pospelov, Maxim
AU - Trott, Michael
PY - 2009
Y1 - 2009
N2 - We point out that when the decay of one electroweak scale super-WIMP state to another occurs at second order in a super-weak coupling constant, this can naturally lead to decay lifetimes that are much larger than the age of the Universe, and create observable consequences for the indirect detection of dark matter. We demonstrate this in a supersymmetric model with Dirac neutrinos, where the right-handed scalar neutrinos are the lightest and next-to-lightest supersymmetric partners. We show that this model produces a super-WIMP decay rate scaling as m ν 4/(weakscale) 3, and may significantly enhance the fraction of energetic electrons and positrons over anti-protons in the decay products. Such a signature is consistent with the observations recently reported by the PAMELA experiment.
AB - We point out that when the decay of one electroweak scale super-WIMP state to another occurs at second order in a super-weak coupling constant, this can naturally lead to decay lifetimes that are much larger than the age of the Universe, and create observable consequences for the indirect detection of dark matter. We demonstrate this in a supersymmetric model with Dirac neutrinos, where the right-handed scalar neutrinos are the lightest and next-to-lightest supersymmetric partners. We show that this model produces a super-WIMP decay rate scaling as m ν 4/(weakscale) 3, and may significantly enhance the fraction of energetic electrons and positrons over anti-protons in the decay products. Such a signature is consistent with the observations recently reported by the PAMELA experiment.
KW - Beyond standard model
KW - Cosmology of theories beyond the SM
KW - Supersymmetric effective theories
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U2 - 10.1088/1126-6708/2009/04/044
DO - 10.1088/1126-6708/2009/04/044
M3 - Article
AN - SCOPUS:67649550141
SN - 1126-6708
VL - 2009
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 4
M1 - 044
ER -