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Title: Kaluza-Klein dark matter and the positron excess

Abstract

The excess of cosmic positrons observed by the High-Energy Antimatter Telescope (HEAT) experiment may be the result of Kaluza-Klein dark matter annihilating in the galactic halo. Kaluza-Klein dark matter annihilates dominantly into charged leptons that yield a large number and hard spectrum of positrons per annihilation. Given a Kaluza-Klein dark matter particle with a mass in the range of 300 GeV-400 GeV, no exceptional substructure or clumping is needed in the local distribution of dark matter to generate a positron flux that explains the HEAT observations. This is in contrast to supersymmetric dark matter which requires unnaturally large amounts of dark substructure to produce the observed positron excess. Future astrophysical and collider tests are outlined that will confirm or rule out this explanation of the HEAT data.

Authors:
 [1];  [2]
  1. Astrophysics Department, University of Oxford, OX1 3RH Oxford (United Kingdom)
  2. School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540 (United States)
Publication Date:
OSTI Identifier:
20698157
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 70; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevD.70.115004; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANNIHILATION; COSMIC POSITRONS; DISTRIBUTION; GEV RANGE; KALUZA-KLEIN THEORY; NONLUMINOUS MATTER; NUCLEAR REACTION YIELD; PARTICLE IDENTIFICATION; REST MASS; SUPERSYMMETRY

Citation Formats

Hooper, Dan, and Kribs, Graham D. Kaluza-Klein dark matter and the positron excess. United States: N. p., 2004. Web. doi:10.1103/PhysRevD.70.115004.
Hooper, Dan, & Kribs, Graham D. Kaluza-Klein dark matter and the positron excess. United States. doi:10.1103/PhysRevD.70.115004.
Hooper, Dan, and Kribs, Graham D. Wed . "Kaluza-Klein dark matter and the positron excess". United States. doi:10.1103/PhysRevD.70.115004.
@article{osti_20698157,
title = {Kaluza-Klein dark matter and the positron excess},
author = {Hooper, Dan and Kribs, Graham D.},
abstractNote = {The excess of cosmic positrons observed by the High-Energy Antimatter Telescope (HEAT) experiment may be the result of Kaluza-Klein dark matter annihilating in the galactic halo. Kaluza-Klein dark matter annihilates dominantly into charged leptons that yield a large number and hard spectrum of positrons per annihilation. Given a Kaluza-Klein dark matter particle with a mass in the range of 300 GeV-400 GeV, no exceptional substructure or clumping is needed in the local distribution of dark matter to generate a positron flux that explains the HEAT observations. This is in contrast to supersymmetric dark matter which requires unnaturally large amounts of dark substructure to produce the observed positron excess. Future astrophysical and collider tests are outlined that will confirm or rule out this explanation of the HEAT data.},
doi = {10.1103/PhysRevD.70.115004},
journal = {Physical Review. D, Particles Fields},
number = 11,
volume = 70,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 2004},
month = {Wed Dec 01 00:00:00 EST 2004}
}