Dark Matter Search in Space: Combined Analysis of Cosmic Ray Antiproton-to-Proton Flux Ratio and Positron Flux Measured by AMS-02 - INSPIRE

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Dark Matter Search in Space: Combined Analysis of Cosmic Ray Antiproton-to-Proton Flux Ratio and Positron Flux Measured by AMS-02

Jie Feng
(
- Zhongshan U.
)
,
Hong-Hao Zhang
(
- Zhongshan U.
)

Jan 9, 2017

9 pages

Published in:

Astrophys.J. 858 (2018) 2, 116

Published: May 15, 2018

e-Print:

1701.02263 [hep-ph]

DOI:

10.3847/1538-4357/aabf87

View in:

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Abstract: (IOP)

Dark matter searches in space have been carried out for many years. Measurements of cosmic-ray (CR) photons, charged antiparticles, and neutrinos are useful tools for dark matter indirect searches. The antiparticle energy spectra of CRs have several exciting features, such as the unexpected positron excess at E ∼ 10–500 GeV and the remarkably flattening antiproton/proton at E ∼ 60–450 GeV precisely measured by the AMS-02 experiment, which cannot be explained simultaneously by secondary production in the interstellar medium. In this work, we report a combined analysis of CR antiproton and positron spectra arising from dark matter on the top of a secondary production in a spatial-dependent propagation model. We discuss the systematic uncertainties from the antiproton production cross section using the two latest Monte Carlo generators, i.e., EPOS LHC and QGSJET-II-04m. We compare their results. In the case of EPOS LHC, we find that the dark matter pair annihilating into τ leptons channel with a 100% branching ratio and the p-wave annihilation cross section assumption is the only possible one-channel scenario to explain the data. On the other hand, there is not a single possible channel in the case of QGSJET-II-04m. We also propose possible two-channel scenarios based on these two Monte Carlo generators.

Note:

10 pages, 7 figures, 2 table, accepted for publication in the ApJ

cosmic rays
dark matter
new physics: search for
AMS
PAMELA
GLAST
dark matter: annihilation
anti-p: cosmic radiation
anti-p: flux
p: cosmic radiation

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