期刊
PHYSICAL REVIEW D
卷 87, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.87.023523
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资金
- NSF [0947827]
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research and Information (MRI)
- Direct For Mathematical & Physical Scien
- Division Of Physics [0947827] Funding Source: National Science Foundation
Models that seek to produce a line at similar to 130 GeV as possibly present in the Fermi data face a number of phenomenological hurdles, not the least of which is achieving the high cross section into gamma gamma required. A simple explanation is a fermionic dark matter particle that couples to photons through loops of charged messengers. We study the size of the dimension-5 dipole (for a pseudo-Dirac state) and dimension-7 Rayleigh operators in such a model, including all higher order corrections in 1/M-mess. Such corrections tend to enhance the annihilation rates beyond the naive effective operators. We find that while freeze-out is generally dominated by the dipole, the present-day gamma-ray signatures are dominated by the Rayleigh operator, except at the most strongly coupled points, motivating a hybrid approach. With this, the magnetic inelastic dark matter scenario provides a successful explanation of the lines at only moderately strong coupling. We also consider the pure Majorana weakly interacting massive particle, where both freeze-out and the Fermi lines can be explained, but only at very strong coupling with light (similar to 200-300 GeV) messengers. In both cases there is no conflict with nonobservation of continuum photons. DOI: 10.1103/PhysRevD.87.023523
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