AMS-02 antiprotons, at last! Secondary astrophysical component and immediate implications for Dark Matter

Using the updated proton and helium fluxes just released by the AMS-02 experiment we reevaluate the secondary astrophysical antiproton to proton ratio and its uncertainties, and compare it with the ratio preliminarly reported by AMS-02. We find no unambiguous evidence for a significant excess with r...

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Bibliographic Details
Published inJournal of cosmology and astroparticle physics Vol. 2015; no. 9; p. 23
Main Authors Giesen, Gaëlle, Boudaud, Mathieu, Génolini, Yoann, Poulin, Vivian, Cirelli, Marco, Salati, Pierre, Serpico, Pasquale D.
Format Journal Article
LanguageEnglish
Published United States Institute of Physics (IOP) 08.09.2015
Subjects
ANNIHILATION
ANTIPROTONS
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BENCHMARKS
COMPARATIVE EVALUATIONS
DIFFUSION
ENERGY DEPENDENCE
HELIUM
High Energy Physics - Phenomenology
LIMITING VALUES
MILKY WAY
NONLUMINOUS MATTER
Physics
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Summary:Using the updated proton and helium fluxes just released by the AMS-02 experiment we reevaluate the secondary astrophysical antiproton to proton ratio and its uncertainties, and compare it with the ratio preliminarly reported by AMS-02. We find no unambiguous evidence for a significant excess with respect to expectations. Yet, some preference for a flatter energy dependence of the diffusion coefficient starts to emerge. Also, we provide a first assessment of the room left for exotic components such as Galactic Dark Matter annihilation or decay, deriving new stringent constraints.
ISSN:1475-7516
1475-7508
1475-7516
DOI:10.1088/1475-7516/2015/09/023