Contact Interactions Involving Right-handed Neutrinos and SN1987A

Abstract

We consider lepton-quark contact interactions in models with right-handed neutrinos, and find that observational data from SN1987A restricts the scale of such interactions to be at least $\Lambda >90$ TeV.

Comments: 7 pages, latex, no figures. Minor corrections to match final version to appear in Phys. Rev. D