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Title:Interpretation of the CALET Electron+Positron Spectrum concerning Dark Matter Signatures
Authors:ID Motz, Holger (Author)
ID Asaoka, Yoichi (Author)
ID Bhattacharyya, Saptashwa (Author)
Files:.pdf ICRC2019_533-Electron.pdf (4,04 MB)
MD5: C7CE793E0C40B6DC47FC3DE54BD30D96
 
URL https://pos.sissa.it/358/533/
 
Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:CALET (CALorimetric Electron Telescope) is in operation on the ISS since October 2015 and directly measures the electron+positron cosmic-ray spectrum up into the TeV-region with fine energy resolution and good proton rejection. Interpretations of the latest results published in [O. Adriani et al. PRL 120, 261102] regarding Dark Matter signatures are presented. Limits on annihilation and decay of Dark Matter were calculated based on an analytic parametrization of the local electron and positron spectra, including a term representing the flux from nearby pulsars as the extra electron-positron-pair source responsible for the positron excess, which is fitted to CALET data and positron flux/fraction data of AMS-02. The expected flux from Dark Matter is calculated with PYTHIA and DRAGON and added to the parametrization with increasing scale factor until reaching 95%CL exclusion, returning a limit on the annihilation cross-section or lifetime. By treating systematic uncertainties with known energy dependence as corrections to the fit function, limits were improved compared to all-random errors. Structures appear in the spectrum, which have been investigated as potential Dark Matter signatures by looking for an improvement of the fit quality with addition of flux from Dark Matter. Thereby, annihilation of ~350 GeV or decay of ~700 GeV Dark Matter to electron-positron pairs is identified as a possible explanation of a step-like structure around 350 GeV. The significance of this signature, Dark Matter explanations of other spectral features and possible astrophysical alternatives are discussed.
Keywords:Cosmic-rays, Dark Matter, CALET
Publication version:Version of Record
Year of publishing:2019
Number of pages:8
Numbering:PoS2019, 533
PID:20.500.12556/RUNG-8548 New window
COBISS.SI-ID:167205123 New window
DOI:https://doi.org/10.22323/1.358.0533 New window
NUK URN:URN:SI:UNG:REP:T5XWTPLN
Publication date in RUNG:05.10.2023
Views:799
Downloads:5
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Record is a part of a proceedings

Title:International Cosmic-Ray Conference

Record is a part of a journal

Title:Proceedings of Science
Publisher:Sissa Medialab
Year of publishing:2019
ISSN:1824-8039

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License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

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