Constraint on the photino mass from cosmology

Details Constraint on the photino mass from cosmology Constraint on the photino mass from cosmology

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phrvl..50.1419g&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 50, May 9, 1983, p. 1419-1422. NSF-supported research.

Physics

635

Annihilation Reactions, Antiparticles, Cosmology, Particle Mass, Constraints, Fermions, Photons

Scientific paper

A lower bound for the photino mass as a function of the spin-zero fermion superpartner mas is derived as an extension of the calculation of Lee and Weinberg (1977). The Majorana nature of the photino induces a p-wave threshold for annihilation of photinos into light fermions, and leads to a rather unexpected form for the bound. For light fermion masses from about 25 to about 45 GeV, the lower bound on photino mass equals 1.8 GeV and about equals the tau mass. For light fermion masses above 45 GeV, the lower bound on the photino mass increses approximately linearly with the light fermion mass to a value of 20 GeV when the mass of the light fermion equals 100 GeV.

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