CALET's sensitivity to Dark Matter annihilation in the galactic halo

Journal Article · Tue Dec 01 00:00:00 EST 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/12/047· OSTI ID:22525107

Motz, H. ^[1]; Asaoka, Y.; Torii, S. ^[2]

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1. International Center for Science and Engineering Projects, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555 Japan (Japan)
2. Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555 Japan (Japan)

CALET (Calorimetric Electron Telescope), installed on the ISS in August 2015, directly measures the electron+positron cosmic rays flux up to 20 TeV. With its proton rejection capability of 1 : 10{sup 5} and an aperture of 1200 cm{sup 2·} sr, it will provide good statistics even well above one TeV, while also featuring an energy resolution of 2%, which allows it to detect fine structures in the spectrum. Such structures may originate from Dark Matter annihilation or decay, making indirect Dark Matter search one of CALET's main science objectives among others such as identification of signatures from nearby supernova remnants, study of the heavy nuclei spectra and gamma astronomy. The latest results from AMS-02 on positron fraction and total electron+positron flux can be fitted with a parametrization including a single pulsar as an extra power law source with exponential cut-off, which emits an equal amount of electrons and positrons. This single pulsar scenario for the positron excess is extrapolated into the TeV region and the expected CALET data for this case are simulated. Based on this prediction for CALET data, the sensitivity of CALET to Dark Matter annihilation in the galactic halo has been calculated. It is shown that CALET could significantly improve the limits compared to current data, especially for those Dark Matter candidates that feature a large fraction of annihilation directly into e{sup +} + e{sup −}, such as the LKP (Lightest Kaluza-Klein particle)

• OSTI ID: 22525107
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANNIHILATION
CALORIMETRY
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
COSMIC ELECTRONS
COSMIC NUCLEI
COSMIC POSITRONS
COSMIC RAY FLUX
FINE STRUCTURE
GALAXIES
GAMMA ASTRONOMY
HEAVY NUCLEI
KALUZA-KLEIN THEORY
NONLUMINOUS MATTER
PULSARS
SUPERNOVA REMNANTS
TELESCOPES
TEV RANGE