Rate for annihilation of galactic dark matter into two photons

Technical Report · Sat Apr 01 00:00:00 EST 1989

OSTI ID:5594857

Giudice, G F; Griest, K

A calculation of the cross section for neutralino-neutralino annihilation into two photons is performed and applied to dark matter in the galactic halo to find the counting rate in a large gamma ray detector such as EGRET (Energetic Gamma Ray Experiment Telescope) or ASTROGAM. Combining constraints from particle accelerators with the requirement that the neutralinos make up the dark matter, it is found that rates of over a few dozen events per year are unlikely. The assumptions that go into these conclusions are listed. Other particle dark matter candidates which could give larger and perhaps observable signals are suggested.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (USA)
• OSTI ID: 5594857
• Report Number(s): N-89-26792; NASA-CR-185029; NAS-1.26:185029; FERMILAB-PUB-89/113-A; TRN: 91-011031
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNIHILATION
PHOTON EMISSION
NEUTRAL PARTICLES
NONLUMINOUS MATTER
COSMIC RADIATION
CROSS SECTIONS
TELESCOPES
THEORETICAL DATA
BASIC INTERACTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
EMISSION
INFORMATION
INTERACTIONS
IONIZING RADIATIONS
NUMERICAL DATA
PARTICLES
RADIATIONS
640106* - Astrophysics & Cosmology- Cosmology