AMS-02 antiprotons from annihilating or decaying dark matter

Recently the AMS-02 experiment reported an excess of cosmic ray antiprotons over the expected astrophysical background. We interpret the excess as a signal from annihilating or decaying dark matter and find that the observed spectrum is well fitted by adding contributions from the annihilation or de...

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Main Authors:	Koichi Hamaguchi, Takeo Moroi, Kazunori Nakayama
Format:	Article
Language:	English
Published:	Elsevier 2015-07-01
Series:	Physics Letters B
Online Access:	http://www.sciencedirect.com/science/article/pii/S0370269315004633

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spelling	doaj-55e224e10741483c9cfd23498a9b32952020-11-24T22:27:56ZengElsevierPhysics Letters B0370-26931873-24452015-07-01747C52352810.1016/j.physletb.2015.06.041AMS-02 antiprotons from annihilating or decaying dark matterKoichi Hamaguchi0Takeo Moroi1Kazunori Nakayama2Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113–0033, JapanDepartment of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113–0033, JapanDepartment of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113–0033, JapanRecently the AMS-02 experiment reported an excess of cosmic ray antiprotons over the expected astrophysical background. We interpret the excess as a signal from annihilating or decaying dark matter and find that the observed spectrum is well fitted by adding contributions from the annihilation or decay of dark matter with mass of O(TeV) or larger. Interestingly, Wino dark matter with mass of around 3 TeV, whose thermal relic abundance is consistent with present dark matter abundance, can explain the antiproton excess. We also discuss the implications for the decaying gravitino dark matter with R-parity violation.http://www.sciencedirect.com/science/article/pii/S0370269315004633
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Koichi Hamaguchi Takeo Moroi Kazunori Nakayama
spellingShingle	Koichi Hamaguchi Takeo Moroi Kazunori Nakayama AMS-02 antiprotons from annihilating or decaying dark matter Physics Letters B
author_facet	Koichi Hamaguchi Takeo Moroi Kazunori Nakayama
author_sort	Koichi Hamaguchi
title	AMS-02 antiprotons from annihilating or decaying dark matter
title_short	AMS-02 antiprotons from annihilating or decaying dark matter
title_full	AMS-02 antiprotons from annihilating or decaying dark matter
title_fullStr	AMS-02 antiprotons from annihilating or decaying dark matter
title_full_unstemmed	AMS-02 antiprotons from annihilating or decaying dark matter
title_sort	ams-02 antiprotons from annihilating or decaying dark matter
publisher	Elsevier
series	Physics Letters B
issn	0370-2693 1873-2445
publishDate	2015-07-01
description	Recently the AMS-02 experiment reported an excess of cosmic ray antiprotons over the expected astrophysical background. We interpret the excess as a signal from annihilating or decaying dark matter and find that the observed spectrum is well fitted by adding contributions from the annihilation or decay of dark matter with mass of O(TeV) or larger. Interestingly, Wino dark matter with mass of around 3 TeV, whose thermal relic abundance is consistent with present dark matter abundance, can explain the antiproton excess. We also discuss the implications for the decaying gravitino dark matter with R-parity violation.
url	http://www.sciencedirect.com/science/article/pii/S0370269315004633
work_keys_str_mv	AT koichihamaguchi ams02antiprotonsfromannihilatingordecayingdarkmatter AT takeomoroi ams02antiprotonsfromannihilatingordecayingdarkmatter AT kazunorinakayama ams02antiprotonsfromannihilatingordecayingdarkmatter
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AMS-02 antiprotons from annihilating or decaying dark matter

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