1996/08/26 by Nelson, Charles A.
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.hep-ph/9608439
In a recent paper, eight semileptonic parameters were defined to specify the most general Lorentz-invariant spin correlation functions for tau semileptonic decays. The parameters were physically defined in terms of tau-decay partial-width intensities for polarized final states. This paper studies how these parameters can be simply measured at a tau/charm factory with longitudinally polarized beams without using spin-correlation techniques. Thereby the parameters can also be used to bound the effective-mass scales Λ for ``new physics" such as arising from lepton compositeness, leptonic CP violation, leptonic T violation, tau weak magnetism, weak electricity, and/or second-class currents.