Annihilation of dipolar dark matter: χχ-bar → γγ

In this work we study the annihilation of dark matter, considering it as a neutral particle with magnetic and/or electric moments not null. The calculation of the effective section of the process χχ-bar → γγ is made starting from a general form of coupling χχ-barγ in the framework of an extension of the Standard Model. We found, when taking into account an annihilation of DDM-antiDDM to monoenergetic photons, that for small masses, m_χ ≤ 0 GeV, an electric dipole moment ∼10^-6 e cm is required to satisfy the current residual density, while for the range of greater sensitivity of HAWC, 10 TeV < E_g < 20 TeV, the electrical dipole moment must be of the order of 10^-8 e cm. (author)