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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Gamma-ray lines may reveal the CP nature of the dark matter particle

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Queiroz, Farinaldo S. [1] ; Yaguna, Carlos E. [2]
Total Authors: 2
[1] Univ Fed Rio Grande do Norte, Int Inst Phys, Campus Univ, BR-59078970 Natal, RN - Brazil
[2] UPTC, Escuela Fis, Ave Cent Norte, Tunja - Colombia
Total Affiliations: 2
Document type: Journal article
Source: Journal of Cosmology and Astroparticle Physics; n. 1 JAN 2019.
Web of Science Citations: 0

Determining the fundamental properties of the dark matter is one of the most important open problems in particle physics today. If the dark matter particle has spin zero, one of these properties is its CP nature. That is, whether it is CP-even (scalar), CP-odd (pseudoscalar), or if its interactions violate CP. In this paper, we show that the observation of gamma-ray lines arising from the decay of a spin-zero dark matter particle could be used to discriminate among these possibilities. We consider a general setup where dark matter decay is induced by effective operators and demonstrate that, due to gauge invariance, there exists correlations among the branching ratios into gauge boson final states (gamma gamma, gamma Z, W+W-, ZZ) that depend on the mass and the CP properties of the dark matter. Consequently, the future observation of gamma-ray lines may in principle be used to establish the CP nature of the dark matter particle. (AU)

FAPESP's process: 16/01343-7 - ICTP South American Institute for Fundamental Research: a regional center for theoretical physics
Grantee:Nathan Jacob Berkovits
Support type: Research Projects - Thematic Grants