Determination of the Michel Parameters rho, xi, and delta in tau-Lepton Decays with tau --> rho nu Tags

ARGUS Collaboration

Using the ARGUS detector at the $e^{+}{e}^{-}$ storage ring DORIS II, we have measured the Michel parameters $\rho$, $\xi$, and $\xi \delta$ for ${\tau }^{\pm }\to l^{\pm }\nu \bar{\nu }$ decays in $\tau$-pair events…