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Title: AMS-02 positron excess and indirect detection of three-body decaying dark matter

Abstract

We consider indirect detection of meta-stable dark matter particles decaying into a stable neutral particle and a pair of standard model fermions. Due to the softer energy spectra from the three-body decay, such models could potentially explain the AMS-02 positron excess without being constrained by the Fermi-LAT gamma-ray data and the cosmic ray anti-proton measurements. We scrutinize over different final state fermions, paying special attention to handling of the cosmic ray background and including various contributions from cosmic ray propagation with the help of the LIKEDM package. It is found that primary decays into an electron-positron pair and a stable neutral particle could give rise to the AMS-02 positron excess and, at the same time, stay unscathed against the gamma-ray and anti-proton constraints. Decays to a muon pair or a mixed flavor electron-muon pair may also be viable depending on the propagation models. Decays to all other standard model fermions are severely disfavored.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Department of Physics, University of California, Davis, CA 95616 (United States)
  2. Fakultät für Physik, Technische Universität Dortmund, 44221 Dortmund (Germany)
  3. Physik-Department T30d, Technische Universität München, James-Franck-Straße, D-85748 Garching (Germany)
  4. High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439 (United States)
  5. Kavli IPMU (WPI), University of Tokyo, Kashiwa, Chiba 277-8583 (Japan)
  6. Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
Publication Date:
OSTI Identifier:
22679961
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMIC RADIATION; COSMIC RAY PROPAGATION; DETECTION; ELECTRONS; ENERGY SPECTRA; FLAVOR MODEL; GAMMA RADIATION; MUON PAIRS; MUONS; NEUTRAL PARTICLES; NONLUMINOUS MATTER; PARTICLE DECAY; POSITRONS; PROTONS; STANDARD MODEL; THREE-BODY PROBLEM

Citation Formats

Cheng, Hsin-Chia, Huang, Wei-Chih, Huang, Xiaoyuan, Low, Ian, Tsai, Yue-Lin Sming, and Yuan, Qiang, E-mail: cheng@physics.ucdavis.edu, E-mail: wei-chih.huang@tu-dortmund.de, E-mail: huangxiaoyuan@gmail.com, E-mail: ilow@northwestern.edu, E-mail: smingtsai@gmail.com, E-mail: yuanq@pmo.ac.cn. AMS-02 positron excess and indirect detection of three-body decaying dark matter. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/03/041.
Cheng, Hsin-Chia, Huang, Wei-Chih, Huang, Xiaoyuan, Low, Ian, Tsai, Yue-Lin Sming, & Yuan, Qiang, E-mail: cheng@physics.ucdavis.edu, E-mail: wei-chih.huang@tu-dortmund.de, E-mail: huangxiaoyuan@gmail.com, E-mail: ilow@northwestern.edu, E-mail: smingtsai@gmail.com, E-mail: yuanq@pmo.ac.cn. AMS-02 positron excess and indirect detection of three-body decaying dark matter. United States. doi:10.1088/1475-7516/2017/03/041.
Cheng, Hsin-Chia, Huang, Wei-Chih, Huang, Xiaoyuan, Low, Ian, Tsai, Yue-Lin Sming, and Yuan, Qiang, E-mail: cheng@physics.ucdavis.edu, E-mail: wei-chih.huang@tu-dortmund.de, E-mail: huangxiaoyuan@gmail.com, E-mail: ilow@northwestern.edu, E-mail: smingtsai@gmail.com, E-mail: yuanq@pmo.ac.cn. Wed . "AMS-02 positron excess and indirect detection of three-body decaying dark matter". United States. doi:10.1088/1475-7516/2017/03/041.
@article{osti_22679961,
title = {AMS-02 positron excess and indirect detection of three-body decaying dark matter},
author = {Cheng, Hsin-Chia and Huang, Wei-Chih and Huang, Xiaoyuan and Low, Ian and Tsai, Yue-Lin Sming and Yuan, Qiang, E-mail: cheng@physics.ucdavis.edu, E-mail: wei-chih.huang@tu-dortmund.de, E-mail: huangxiaoyuan@gmail.com, E-mail: ilow@northwestern.edu, E-mail: smingtsai@gmail.com, E-mail: yuanq@pmo.ac.cn},
abstractNote = {We consider indirect detection of meta-stable dark matter particles decaying into a stable neutral particle and a pair of standard model fermions. Due to the softer energy spectra from the three-body decay, such models could potentially explain the AMS-02 positron excess without being constrained by the Fermi-LAT gamma-ray data and the cosmic ray anti-proton measurements. We scrutinize over different final state fermions, paying special attention to handling of the cosmic ray background and including various contributions from cosmic ray propagation with the help of the LIKEDM package. It is found that primary decays into an electron-positron pair and a stable neutral particle could give rise to the AMS-02 positron excess and, at the same time, stay unscathed against the gamma-ray and anti-proton constraints. Decays to a muon pair or a mixed flavor electron-muon pair may also be viable depending on the propagation models. Decays to all other standard model fermions are severely disfavored.},
doi = {10.1088/1475-7516/2017/03/041},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 03,
volume = 2017,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}