Fits to the Fermi-LAT GeV excess with right-handed sneutrino dark matter: Implications for direct and indirect dark matter searches and the LHC
Entity
UAM. Departamento de Física TeóricaPublisher
American Physical SocietyDate
2015-06-22Citation
10.1103/PhysRevD.91.123530
Physical Review D 91.12 (2015): 123530
ISSN
1550-7998 (print); 1550-2368 (online)DOI
10.1103/PhysRevD.91.123530Funded by
We thank the support of the ConsoliderIngenio 2010 program under Grant No. MULTIDARK CSD2009-00064, the Spanish MICINN under Grants No. FPA2012-34694 and No. FPA2013-44773-P, the Spanish MINECO Centro de Excelencia Severo Ochoa Program under Grant No. SEV-2012-0249, and the European Union under the ERC Advanced Grant SPLE under Contract No. ERC-2012-ADG-20120216-320421Project
Gobierno de España. CSD2009-00064; Gobierno de España. FPA2012-34694; Gobierno de España. FPA2013-44773-P; Gobierno de España. SEV-2012-0249; info:eu-repo/grantAgreement/EC/FP7/320421Editor's Version
http://dx.doi.org/10.1103/PhysRevD.91.123530Subjects
FísicaRights
© 2015 American Physical SocietyAbstract
We show that the right-handed (RH) sneutrino in the next-to-minimal supersymmetric standard model can account for the observed excess in the Fermi-LAT spectrum of gamma rays from the Galactic center, while fulfilling all the current experimental constraints from the LHC as well as from direct and indirect dark matter searches. We have explored the parameter space of this scenario, computed the gamma-ray spectrum for each phenomenologically viable solution and then performed a χ2 fit to the excess. Unlike previous studies based on model-independent interpretations, we have taken into account the full annihilation spectrum, without assuming pure annihilation channels. Furthermore, we have incorporated limits from direct detection experiments, LHC bounds and also the constraints from Fermi-LAT on dwarf spheroidal galaxies and gamma-ray spectral lines. In addition, we have estimated the effect of the most recent Fermi-LAT reprocessed data (pass 8). In general, we obtain good fits to the Galactic center excess (GCE) when the RH sneutrino annihilates mainly into pairs of light singletlike scalar or pseudoscalar Higgs bosons that subsequently decay in flight, producing four-body final states and spectral features that improve the goodness of the fit at large energies. The best fit (χ2=20.8) corresponds to a RH sneutrino with a mass of 64 GeV which annihilates preferentially into a pair of light singletlike pseudoscalar Higgs bosons (with masses of order 60 GeV). Besides, we have analyzed other channels that also provide good fits to the excess. Finally, we discuss the implications for direct and indirect detection searches paying special attention to the possible appearance of gamma-ray spectral features in near future Fermi-LAT analyses, as well as deviations from the Standard Model-like Higgs properties at the LHC. Remarkably, many of the scenarios that fit the GCE can also be probed by these other complementary techniques
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Google Scholar:Cerdeño, D. G.
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Peiró, M.
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Robles, S.
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