論文

査読有り
2017年8月

Decaying fermionic dark matter search with CALET

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
  • S. Bhattacharyya
  • ,
  • H. Motz
  • ,
  • S. Torii
  • ,
  • Y. Asaoka

2017
8
開始ページ
12
終了ページ
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1088/1475-7516/2017/08/012
出版者・発行元
IOP PUBLISHING LTD

The ISS-based CALET (CALorimetric Electron Telescope) detector can play an important role in indirect search for Dark Matter (DM), measuring the electron+positron flux in the TeV region for the first time directly. With its fine energy resolution of approximately 2% and good proton rejection ratio (1 : 10(5)) it has the potential to search for fine structures in the Cosmic Ray (CR) electron spectrum. In this context we discuss the ability of CALET to discern between signals originating from astrophysical sources and DM decay. We fit a parametrization of the local interstellar electron and positron spectra to current measurements, with either a pulsar or 3-body decay of fermionic DM as the extra source causing the positron excess. The expected CALET data for scenarios in which DM decay explains the excess are calculated and analyzed. The signal from this particular 3-body DM decay which can explain the recent measurements from the AMS-02 experiment is shown to be distinguishable from a single pulsar source causing the positron excess by 5 years of observation with CALET, based on the shape of the spectrum. We also study the constraints from diffuse gamma-ray data on this DM-only explanation of the positron excess and show that especially for the possibly remaining parameter space a clearly identifiable signature in the CR electron spectrum exists.

リンク情報
DOI
https://doi.org/10.1088/1475-7516/2017/08/012
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000408311900012&DestApp=WOS_CPL
ID情報
  • DOI : 10.1088/1475-7516/2017/08/012
  • ISSN : 1475-7516
  • Web of Science ID : WOS:000408311900012

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