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Title: AMS-02 antiprotons reloaded

Abstract

The AMS-02 collaboration has released preliminary data on the antiproton fraction in cosmic rays. The surprisingly hard antiproton spectrum at high rigidity has triggered speculations about a possible primary antiproton component originating from dark matter annihilations. In this note, we employ newly available AMS-02 boron to carbon data to update the secondary antiproton flux within the standard two-zone diffusion model. The new background permits a considerably better fit to the measured antiproton fraction compared to previous estimates. This is mainly a consequence of the smaller slope of the diffusion coefficient favored by the new AMS-02 boron to carbon data.

Authors:
; ;  [1]
  1. Bethe Center for Theoretical Physics and Physikalisches Institut der Universität Bonn, Nußallee 12, Bonn, 53115 Germany (Germany)
Publication Date:
OSTI Identifier:
22525250
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; ANTIPROTONS; BORON; CARBON; COMPARATIVE EVALUATIONS; COSMIC RADIATION; DIFFUSION; ENERGY SPECTRA; NONLUMINOUS MATTER; ZONES

Citation Formats

Kappl, Rolf, Reinert, Annika, and Winkler, Martin Wolfgang, E-mail: kappl@th.physik.uni-bonn.de, E-mail: areinert@th.physik.uni-bonn.de, E-mail: winkler@th.physik.uni-bonn.de. AMS-02 antiprotons reloaded. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/10/034.
Kappl, Rolf, Reinert, Annika, & Winkler, Martin Wolfgang, E-mail: kappl@th.physik.uni-bonn.de, E-mail: areinert@th.physik.uni-bonn.de, E-mail: winkler@th.physik.uni-bonn.de. AMS-02 antiprotons reloaded. United States. doi:10.1088/1475-7516/2015/10/034.
Kappl, Rolf, Reinert, Annika, and Winkler, Martin Wolfgang, E-mail: kappl@th.physik.uni-bonn.de, E-mail: areinert@th.physik.uni-bonn.de, E-mail: winkler@th.physik.uni-bonn.de. Thu . "AMS-02 antiprotons reloaded". United States. doi:10.1088/1475-7516/2015/10/034.
@article{osti_22525250,
title = {AMS-02 antiprotons reloaded},
author = {Kappl, Rolf and Reinert, Annika and Winkler, Martin Wolfgang, E-mail: kappl@th.physik.uni-bonn.de, E-mail: areinert@th.physik.uni-bonn.de, E-mail: winkler@th.physik.uni-bonn.de},
abstractNote = {The AMS-02 collaboration has released preliminary data on the antiproton fraction in cosmic rays. The surprisingly hard antiproton spectrum at high rigidity has triggered speculations about a possible primary antiproton component originating from dark matter annihilations. In this note, we employ newly available AMS-02 boron to carbon data to update the secondary antiproton flux within the standard two-zone diffusion model. The new background permits a considerably better fit to the measured antiproton fraction compared to previous estimates. This is mainly a consequence of the smaller slope of the diffusion coefficient favored by the new AMS-02 boron to carbon data.},
doi = {10.1088/1475-7516/2015/10/034},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}