Three-body annihilation of neutralinos below two-body thresholds
We calculate the cross section for s-wave neutralino annihilation to three-body final states below the W+W- and tbar t thresholds. Such three-body channels may dominate the annihilation cross section if the neutralino mass is not too much less than mt and mW respectively. Furthermore, because neutrinos produced in these channels are much more energetic than those from the bbar b or τ+τ- channels, they can dominate the energetic-neutrino fluxes from neutralino annihilation in the Sun or Earth far below these thresholds and significantly enhance the neutrino signal in certain regions of the supersymmetric parameter space.
Additional Information© SISSA 1998 Received 20 May 1998, accepted for publication 7 July 1998, Published 5 August 1998 We thank G. Jungman for help with the neutdriver code. This work was supported by D.O.E. Contract No. DEFG02-92-ER 40699, NASA NAG5-3091, and the Alfred P. Sloan Foundation.
Published - CHEjhep98.pdf