Rate for annihilation of galactic dark matter into two photons

Journal Article · Sun Oct 15 00:00:00 EDT 1989 · Physical Review (Section) D: Particles and Fields; (USA)

DOI:https://doi.org/10.1103/PhysRevD.40.2549· OSTI ID:5355557

Giudice, G F ^[1]; Griest, K ^[2]

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1. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (US)
2. Astronomy and Astrophysics Center, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510

We perform a calculation of the cross section for neutralino-neutralino annihilation into two photons and apply it to dark matter in the galactic halo to find the counting rate in a large {gamma}-ray detector such as EGRET or ASTROGAM. Combining constraints from particle accelerators with the requirement that the neutralinos make up the dark matter we find that rates over a few dozen events per year are unlikely. We list the assumptions that go into our conclusions and suggest other particle dark-matter candidates which could give larger and perhaps observable signals.

• OSTI ID: 5355557
• Journal Information: Physical Review (Section) D: Particles and Fields; (USA), Vol. 40:8; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXIES
NONLUMINOUS MATTER
ANNIHILATION
CROSS SECTIONS
ELASTIC SCATTERING
FERMIONS
FEYNMAN DIAGRAM
GAMMA DETECTION
GAUGE INVARIANCE
HIGGS BOSONS
MASS
NEUTRINOS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PHOTONS
WEAK INTERACTIONS
BASIC INTERACTIONS
DETECTION
DIAGRAMS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTONS
MASSLESS PARTICLES
POSTULATED PARTICLES
RADIATION DETECTION
SCATTERING
640105* - Astrophysics & Cosmology- Galaxies