Cosmic ray positron excess and neutralino dark matter

Update Item Information
Publication Type Journal Article
School or College College of Science
Department Physics
Creator Gondolo, Paolo
Other Author Baltz, Edward A.; Edsjö, Joakim; Freese, Katherine
Title Cosmic ray positron excess and neutralino dark matter
Date 2002-02
Description Using a new instrument, the HEAT Collaboration has confirmed the excess of cosmic ray positrons that they first detected in 1994. We explore the possibility that this excess is due to the annihilation of neutralino dark matter in the galactic halo. We confirm that neutralino annihilation can produce enough positrons to make up the measured excess only if there is an additional enhancement to the signal. We quantify the ‘‘boost factor'' that is required in the signal for various models in the Minimal Supersymmetric Standard Model parameter space, and study the dependence on various parameters. We find models with a boost factor >30. Such an enhancement in the signal could arise if we live in a clumpy halo. We discuss what part of supersymmetric parameter space is favored (in that it gives the largest positron signal), and the consequences for other direct and indirect searches of supersymmetric dark matter.
Type Text
Publisher American Physical Society
Journal Title Physical Review D
Volume 65
Issue 6
First Page 63511
Last Page 63510
DOI 10.1103/PhysRevD.65.063511
citatation_issn 0556-2821
Subject Neutralinos; Supersymmetric models; Positron flux; Annihilations
Subject LCSH Dark matter (Astronomy); Particles (Nuclear physics); Positrons; Cosmic rays; Supersymmetry
Language eng
Bibliographic Citation Baltz, E. A., Edsjö, J., Freese, K., & Gondolo, P. (2002). Cosmic ray positron excess and neutralino dark matter. Physical Review D, 65, 063511-10.
Rights Management (c) American Physical Society http://dx.doi.org/10.1103/PhysRevD.65.063511
Format Medium application/pdf
Format Extent 189,227 bytes
Identifier ir-main,9220
ARK ark:/87278/s6h428mp
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Reference URL https://collections.lib.utah.edu/ark:/87278/s6h428mp