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• W2043965998 startingPage "046" @default.
• W2043965998 abstract "Although proposed long ago, the search for internal bremsstrahlung signatures has only recently been made possible by the excellent energy resolution of ground-based and satellite-borne gamma-ray instruments. Here, we investigate thoroughly the current status of internal bremsstrahlung searches in light of the results of direct dark matter searches and in the framework of a minimal mass-degenerate scenario consisting of a Majorana dark matter particle that couples to a fermion and a scalar via a Yukawa coupling. The upper limits on the annihilation cross section set by Fermi-LAT and H.E.S.S. extend uninterrupted from tens of GeV up to tens of TeV and are rather insensitive to the mass degeneracy in the particle physics model. In contrast, direct searches are best in the moderate to low mass splitting regime, where XENON100 limits overshadow Fermi-LAT and H.E.S.S. up to TeV masses if dark matter couples to one of the light quarks. In our minimal scenario we examine carefully the prospects for GAMMA-400, CTA and XENON1T, all planned to come online in the near future, and find that: (a) CTA and XENON1T are fully complementary, with CTA most sensitive to multi-TeV masses and mass splittings around 10%, and XENON1T probing best small mass splittings up to TeV masses; and (b) current constraints from XENON100 already preclude the observation of any spectral feature with GAMMA-400 in spite of its impressive energy resolution, unless dark matter does not couple predominantly to light quarks. Finally, we point out that, unlike for direct searches, the possibility of detecting thermal relics in upcoming internal bremsstrahlung searches requires, depending on the concrete scenario, boost factors larger than 5–10." @default.
• W2043965998 created "2016-06-24" @default.
• W2043965998 creator A5004558681 @default.
• W2043965998 creator A5011374072 @default.
• W2043965998 creator A5019969490 @default.
• W2043965998 creator A5056517784 @default.
• W2043965998 date "2013-12-20" @default.
• W2043965998 modified "2023-09-25" @default.
• W2043965998 title "Internal bremsstrahlung signatures in light of direct dark matter searches" @default.
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• W2043965998 doi "https://doi.org/10.1088/1475-7516/2013/12/046" @default.
• W2043965998 hasPublicationYear "2013" @default.
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