Effective field theory approach to the Galactic Center gamma-ray excess

Effective field theory approach to the Galactic Center gamma-ray excess

Author Alves, Alexandre Autor UNIFESP Google Scholar
Profumo, Stefano Google Scholar
Queiroz, Farinaldo S. Google Scholar
Shepherd, William Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Univ Calif Santa Cruz
Abstract We explore the possibility of explaining a gamma-ray excess in the Galactic center, originally pointed out by Hooper, collaborators, and other groups, in an effective field theory framework. We assume that dark matter annihilation is mediated by particles heavy enough to be integrated out and that such particles couple to all quark families. We calculate the effective coupling required to explain the annihilation signal in the Galactic center and compare with bounds from direct detection, collider searches, and the requirement that the dark matter particles make up the appropriate fraction of the universal energy budget. We find that only a very small set of operators can explain the gamma-ray excess while being consistent with other constraints. Specifically, for scalar dark matter, the viable options are one scalar-type coupling to quarks and one interaction with gluons, while for fermionic (Dirac) dark matter, the viable options are two scalartype dimension-7 operators or a dimension-6 vector-type operator. in all cases, future searches with the Large Hadron Collider should probe the relevant operators' effective energy scale, while all viable interactions should escape direct detection experiments.
Language English
Sponsor Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
U.S. Department of Energy
Fundacao de Amparao a Pesquisa do Estado de São Paulo
Grant number U.S. Department of Energy: SC0010107
Fundacao de Amparao a Pesquisa do Estado de São Paulo: 2013/22079-8
Date 2014-12-01
Published in Physical Review D. College Pk: Amer Physical Soc, v. 90, n. 11, 7 p., 2014.
ISSN 1550-7998 (Sherpa/Romeo, impact factor)
Publisher Amer Physical Soc
Extent 7
Origin http://dx.doi.org/10.1103/PhysRevD.90.115003
Access rights Closed access
Type Article
Web of Science ID WOS:000346442200009
URI http://repositorio.unifesp.br/handle/11600/38528

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