David G. Cerdeño
Fits to the Fermi-LAT GeV excess with right-handed sneutrino dark matter: implications for direct and indirect dark matter searches and the LHC
Cerdeño, David G.; Peiró, Miguel; Robles, Sandra
Authors
Miguel Peiró
Sandra Robles
Abstract
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 χ 2 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 (χ 2 =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.
Citation
Cerdeño, D. G., Peiró, M., & Robles, S. (2015). Fits to the Fermi-LAT GeV excess with right-handed sneutrino dark matter: implications for direct and indirect dark matter searches and the LHC. Physical Review D, 91(12), Article 123530. https://doi.org/10.1103/physrevd.91.123530
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 22, 2015 |
Online Publication Date | Jun 22, 2015 |
Publication Date | Jun 22, 2015 |
Deposit Date | Oct 21, 2015 |
Publicly Available Date | Oct 28, 2015 |
Journal | Physical Review D |
Print ISSN | 1550-7998 |
Electronic ISSN | 1550-2368 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 91 |
Issue | 12 |
Article Number | 123530 |
DOI | https://doi.org/10.1103/physrevd.91.123530 |
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Copyright Statement
Reprinted with permission from the American Physical Society: Physical Review D 91, 123530 © 2015 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
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