Tests for Tau’s Charged-current Structure

The Lorentz structure of the tau lepton’s charged-current can almost be completely determined by use of stage-two spin-correlation functions for the {ρ−, ρ+}and {a1 , a1 } decay modes. It is possible to test for a “(V − A) + something” structure in the JLepton current, so as to bound the scales Λ for “new physics” such as arising from tau weak magnetism, weak electricity, and/or second-class currents. In practice, only limited information can be obtained from the τ → πν channels. Electronic address: cnelson @ bingvmb.cc.binghamton.edu Contributed paper to LP95, Beijing. Revision of SUNY BING [10/1/94] which will appear in Phys. Let.