Cross sections, relic abundance, and detection rates for neutralino dark matter

Journal Article · Sat Oct 15 00:00:00 EDT 1988 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.38.2357· OSTI ID:6799142

Griest, K

Neutralino annihilation and elastic scattering cross sections are derived which differ in important ways from previous work. These are applied to relic abundance calculations and to direct detection of neutralino dark matter from the galactic halo. Assuming the neutralino is the lightest supersymmetric particle and that it is less massive than the Z/sup 0/, we find relic densities of neutralinos greater than 4% of critical density for almost all values of the supersymmetric parameters. We constrain the parameter space by using results from the DESY e/sup +/e/sup -/ storage ring PETRA (chargino mass less than 23 GeV) and the ASP detector at the SLAC storage ring PEP, and then assuming a critical density of neutralinos, display event rates in a cryogenic detector for a variety of models. A new term implies ''spin-independent'' elastic scattering even for these Majorana particles and inclusion of propagator momenta increases detection rates by 10--300 % even for pure photinos. Z/sup 0/-squark interference leads to very low detection rates for some values of the parameters. The new term in the elastic cross section dominates for heavy, mostly spinless materials and mitigates the negative interference cancellations in light materials, except for the pure photino or pure Higgsino cases where it does not contribute. In general, the rates can be substantially different from the pure photino and pure Higgsino special cases usually considered.

• Research Organization: Astronomy and Astrophysics Center, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637
• OSTI ID: 6799142
• Journal Information: Phys. Rev. D; (United States), Vol. 38:8
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
GALAXIES
RELICT RADIATION
POSTULATED PARTICLES
PARTICLE INTERACTIONS
ANNIHILATION
CROSS SECTIONS
ELASTIC SCATTERING
GRAND UNIFIED THEORY
NONLUMINOUS MATTER
SUPERSYMMETRY
BASIC INTERACTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FIELD THEORIES
INTERACTIONS
MATHEMATICAL MODELS
MICROWAVE RADIATION
PARTICLE MODELS
RADIATIONS
SCATTERING
SYMMETRY
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
640105* - Astrophysics & Cosmology- Galaxies
645400 - High Energy Physics- Field Theory