On the effective operators for Dark Matter annihilations

Journal Article · Fri Feb 01 00:00:00 EST 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/02/039· OSTI ID:22282927

Simone, Andrea De; Thamm, Andrea ^[1]; Monin, Alexander ^[2]; Urbano, Alfredo ^[3]

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1. CERN, Theory Division, CH-1211 Geneva 23 (Switzerland)
2. Institut de Théorie des Phénomènes Physiques, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne (Switzerland)
3. SISSA, via Bonomea 265, I-34136 Trieste (Italy)

We consider effective operators describing Dark Matter (DM) interactions with Standard Model fermions. In the non-relativistic limit of the DM field, the operators can be organized according to their mass dimension and their velocity behaviour, i.e. whether they describe s- or p-wave annihilations. The analysis is carried out for self-conjugate DM (real scalar or Majorana fermion). In this case, the helicity suppression at work in the annihilation into fermions is lifted by electroweak bremsstrahlung. We construct and study all dimension-8 operators encoding such an effect. These results are of interest in indirect DM searches.

• OSTI ID: 22282927
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANNIHILATION
BREMSSTRAHLUNG
FERMIONS
FIELD OPERATORS
HELICITY
MASS
NONLUMINOUS MATTER
P WAVES
RELATIVISTIC RANGE
S WAVES
SCALARS
STANDARD MODEL
VELOCITY