2004/05/14 by Milagro Collaboration, R. Atkins, W. Benbow +36
Physics and Astronomy · #Air shower #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Cherenkov radiation #Cosmic ray #Cosmology #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Detector #Gamma ray #Neutralino #Nuclear physics #Optics #Particle Detector Development and Performance #Particle physics #Physics #Scalar field dark matter #WIMP #Weakly interacting massive particles #astro-ph
paper · pdf · doi:10.1103/physrevd.70.083516
arxiv created 2004/05/14 · openalex publication_date 2004/10/13 · openalex created_date 2016/06/24 · arxiv updated 2017/01/04 · openalex updated_date 2026/08/05
The neutralino, the lightest stable supersymmetric particle, is a strong theoretical candidate for the missing astronomical ``dark matter''. A profusion of such neutralinos can accumulate near the Sun when they lose energy upon scattering and are gravitationally captured. Pair-annihilations of those neutralinos may produce very high-energy (VHE, above 100 GeV) gamma rays. Milagro is an air shower array which uses the water Cherenkov technique to detect extensive-air showers and is capable of observing VHE gamma rays from the direction of the Sun with an angular resolution of 0.75\ifmmode^∘\else\textdegree\fi. Analysis of Milagro data with an exposure to the Sun of 1165 hours presents the first attempt to detect TeV gamma rays produced by annihilating neutralinos captured by the Solar system and shows no statistically significant signal. Resulting limits that can be set on the gamma-ray flux due to near-Solar neutralino annihilations and on the neutralino cross-section are presented.