On the sensitivity of CTA to gamma-ray boxes from multi-TeV dark matter

Collider, direct and indirect searches for dark matter have typically little or no sensitivity to weakly interacting massive particles (WIMPs) with masses above a few TeV. This rather unexplored regime can however be probed through the search for distinctive gamma-ray spectral features produced by the annihilation of WIMPs at very high energies. Here we present a dedicated search for gamma-ray boxes - sharp spectral features that cannot be mimicked by astrophysical sources - with the upcoming Cherenkov Telescope Array (CTA). Using realistic projections for the instrument performance and detailed background modelling, a pro file likelihood analysis is implemented to derive the expected upper limits and sensitivity reach after 100 h of observations towards a 2 degrees x 2 degrees region around the Galactic centre. Our results show that CTA will be able to probe gamma-ray boxes down to annihilation cross sections of 10(-27) - 10(-26) cm(3)/s up to tens of TeV. We also identify a number of concrete particle physics models providing thermal dark matter candidates that can be used as target benchmarks in future search campaigns. This constitutes a golden opportunity for CTA to either discover or rule out multi-TeV thermal dark matter in a corner of parameter space where all other experimental efforts are basically insensitive.

Lamperstorfer, Anna S. (författare)
Lopez-Gehler, Sergio (författare)
Pato, MiguelStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Technical University of Munich, Germany(Swepub:su)mpato (författare)
Bertone, Gianfranco (författare)
Stockholms universitetFysikum (creator_code:org_t)

Ingår i:Journal of Cosmology and Astroparticle Physics: IOP Publishing:91475-7516

Av författaren/redakt...: Ibarra, Alejandr ...; Lamperstorfer, A ...; Lopez-Gehler, Se ...; Pato, Miguel; Bertone, Gianfra ...

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