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2013

Imprint of Multi-component Dark Matter on AMS-02

Geng, Chao-Qiang, Huang, Da, Tsai, Lu-Hsing

Understand

The multi-component decaying dark matter (DM) scenario is investigated to explain the possible excesses in the positron fraction by PAMELA and recently confirmed by AMS-02, and in the total $e^+ +e^-$ flux observed by Fermi-LAT.

By performing the $\chi^2$ fits, we find that two DM components are already enough to give a reasonable fit of both AMS-02 and Fermi-LAT data.
The best-fitted results show that the heavier DM component with its mass 1.5 TeV dominantly decays through the $\mu$-channel, while the lighter one of 100 GeV mainly through the $\tau$-channel.
As a byproduct, the fine structure around 100 GeV observed by AMS-02 and Fermi-LAT can be naturally explained by the dropping due to the lighter DM component.

Built on

L. J. Gleeson and W. I. Axford, Astrophys. J. 154
1968
Earlier work this paper cites.
L. Bergstrom, T. Bringmann and J. Edsjo, Phys. Rev. D 78
Original
1980
Earlier work this paper cites.
K. G. Begeman, A. H. Broeils and R. H. Sanders, Mon. Not. Roy. Astron. Soc. 249
1991
Earlier work this paper cites.
Q. Yuan, X. J. Bi, G. M. Chen, Y. Q. Guo, S. J. Lin and X. Zhang, arXiv:1304.1482 [astro-ph.HE]; H. B. Jin, Y. L. Wu and Y. F. Zhou, arXiv:1304.1997 [hep-ph]
Original
1997
Earlier work this paper cites.
P. Sreekumar et al
1998
Earlier work this paper cites.
E. A. Baltz and J. Edsjo, Phys. Rev. D 59
1998
Earlier work this paper cites.
A. W. Strong and I. V. Moskalenko, Astrophys. J. 509
1998
Earlier work this paper cites.
M. Boezio et al
2000
Earlier work this paper cites.
M. A. DuVernois et al
2001
Earlier work this paper cites.
J. J. Beatty et al
2004
Earlier work this paper cites.
N. Fornengo, L. Pieri and S. Scopel, Phys. Rev. D 70
2004
Earlier work this paper cites.
J. F. Beacom, N. F. Bell and G. Bertone, Phys. Rev. Lett. 94
2005
Earlier work this paper cites.
T. Sjostrand, S. Mrenna and P. Z. Skands, JHEP 0605
2006
Earlier work this paper cites.
M. Aguilar et al
2007
Earlier work this paper cites.
J. Chang et al
2008
Earlier work this paper cites.
F. Aharonian et al
Original
2008
Earlier work this paper cites.