Searching For Anomalous $\tau \nu W$ Couplings

Abstract

The capability of current and future measurements at low and high energy $e^{+}{e}^{-}$ colliders to probe for the existence of anomalous, CP conserving, $\tau \nu W$ dipole moment-type couplings is examined. At present, constraints on the universality of the tau charged and neutral current interactions as well as the shape of the $\tau \to \ell$ energy spectrum provide the strongest bounds on such anomalous couplings. The presence of these dipole moments are shown to influence, e.g., the extraction of ${\alpha }_s(m_{\tau }^2)$ from $\tau$ decays and can lead to apparent violations of CVC expectations.

Comments: 24 pages, 9 figures