An interpretation of the cosmic ray e + + e - Spectrum from 10 GeV to 3 TeV measured by CALET on the ISS

Saptashwa Bhattacharyya, Holger Martin Motz, Yoichi Asaoka, Shoji Torii

Research output: Contribution to journalArticle

Abstract

A combined interpretation of the Calorimetric Electron Telescope (CALET) e+ + e- spectrum up to 3TeV and the AMS-02 positron spectrum up to 500GeV was performed and the results are discussed. To parametrize the background electron flux, we assume a smoothly broken power-law spectrum with an exponential cutoff for electrons and fit this parametrization to the measurements, with either a pulsar or 3-body decay of fermionic Dark Matter (DM) as the extra electron-positron pair source responsible for the positron excess. We found that depending on the parameters for the background, both DM decay and the pulsar model can explain the combined measurements. While the DM decay scenario is constrained by the Fermi-LAT γ-ray measurement, we show that 3-body decay of a 800GeV DM can be compatible with the γ-ray flux measurement. We discuss the capability of CALET to discern decaying DM models from a generic pulsar source scenario, based on simulated data for five years of data-taking.

Original languageEnglish
JournalInternational Journal of Modern Physics D
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

particle telescopes
Cosmic Rays
International Space Station
Dark Matter
cosmic ray
Telescope
cosmic rays
dark matter
Pulsars
Electron
electron
Decay
pulsars
decay
Half line
positrons
rays
Scenarios
electron-positron pairs
Alpha Magnetic Spectrometer

Keywords

  • CALET
  • cosmic rays
  • dark matter

ASJC Scopus subject areas

  • Mathematical Physics
  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "An interpretation of the cosmic ray e + + e - Spectrum from 10 GeV to 3 TeV measured by CALET on the ISS",
abstract = "A combined interpretation of the Calorimetric Electron Telescope (CALET) e+ + e- spectrum up to 3TeV and the AMS-02 positron spectrum up to 500GeV was performed and the results are discussed. To parametrize the background electron flux, we assume a smoothly broken power-law spectrum with an exponential cutoff for electrons and fit this parametrization to the measurements, with either a pulsar or 3-body decay of fermionic Dark Matter (DM) as the extra electron-positron pair source responsible for the positron excess. We found that depending on the parameters for the background, both DM decay and the pulsar model can explain the combined measurements. While the DM decay scenario is constrained by the Fermi-LAT γ-ray measurement, we show that 3-body decay of a 800GeV DM can be compatible with the γ-ray flux measurement. We discuss the capability of CALET to discern decaying DM models from a generic pulsar source scenario, based on simulated data for five years of data-taking.",
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author = "Saptashwa Bhattacharyya and Motz, {Holger Martin} and Yoichi Asaoka and Shoji Torii",
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AU - Asaoka, Yoichi

AU - Torii, Shoji

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N2 - A combined interpretation of the Calorimetric Electron Telescope (CALET) e+ + e- spectrum up to 3TeV and the AMS-02 positron spectrum up to 500GeV was performed and the results are discussed. To parametrize the background electron flux, we assume a smoothly broken power-law spectrum with an exponential cutoff for electrons and fit this parametrization to the measurements, with either a pulsar or 3-body decay of fermionic Dark Matter (DM) as the extra electron-positron pair source responsible for the positron excess. We found that depending on the parameters for the background, both DM decay and the pulsar model can explain the combined measurements. While the DM decay scenario is constrained by the Fermi-LAT γ-ray measurement, we show that 3-body decay of a 800GeV DM can be compatible with the γ-ray flux measurement. We discuss the capability of CALET to discern decaying DM models from a generic pulsar source scenario, based on simulated data for five years of data-taking.

AB - A combined interpretation of the Calorimetric Electron Telescope (CALET) e+ + e- spectrum up to 3TeV and the AMS-02 positron spectrum up to 500GeV was performed and the results are discussed. To parametrize the background electron flux, we assume a smoothly broken power-law spectrum with an exponential cutoff for electrons and fit this parametrization to the measurements, with either a pulsar or 3-body decay of fermionic Dark Matter (DM) as the extra electron-positron pair source responsible for the positron excess. We found that depending on the parameters for the background, both DM decay and the pulsar model can explain the combined measurements. While the DM decay scenario is constrained by the Fermi-LAT γ-ray measurement, we show that 3-body decay of a 800GeV DM can be compatible with the γ-ray flux measurement. We discuss the capability of CALET to discern decaying DM models from a generic pulsar source scenario, based on simulated data for five years of data-taking.

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