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Naslov:Interpretation of the CALET Electron+Positron Spectrum concerning Dark Matter Signatures
Avtorji:ID Motz, Holger (Avtor)
ID Asaoka, Yoichi (Avtor)
ID Bhattacharyya, Saptashwa (Avtor)
Datoteke:.pdf ICRC2019_533-Electron.pdf (4,04 MB)
MD5: C7CE793E0C40B6DC47FC3DE54BD30D96
 
URL https://pos.sissa.it/358/533/
 
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis: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.
Ključne besede:Cosmic-rays, Dark Matter, CALET
Verzija publikacije:Objavljena publikacija
Leto izida:2019
Št. strani:8
Številčenje:PoS2019, 533
PID:20.500.12556/RUNG-8548 Novo okno
COBISS.SI-ID:167205123 Novo okno
DOI:https://doi.org/10.22323/1.358.0533 Novo okno
NUK URN:URN:SI:UNG:REP:T5XWTPLN
Datum objave v RUNG:05.10.2023
Število ogledov:2133
Število prenosov:6
Metapodatki:XML DC-XML DC-RDF
:
MOTZ, Holger, ASAOKA, Yoichi in BHATTACHARYYA, Saptashwa, 2019, Interpretation of the CALET Electron+Positron Spectrum concerning Dark Matter Signatures. International Cosmic-Ray Conference [na spletu]. 2019. Vol. PoS2019, no. 533. [Dostopano 7 april 2025]. DOI https://doi.org/10.22323/1.358.0533. Pridobljeno s: https://repozitorij.ung.si/IzpisGradiva.php?lang=slv&id=8548
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Gradivo je del zbornika

Naslov:International Cosmic-Ray Conference

Gradivo je del revije

Naslov:Proceedings of Science
Založnik:Sissa Medialab
Leto izida:2019
ISSN:1824-8039

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Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
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