Improved Direct Measurement of $A_b$ and $A_c$ at the $Z^0$ Pole Using a Lepton Tag

SLD Collaboration, Kenji Abe

The parity violation parameters $A_b$ and $A_c$ of the $Zb\bar{b}$ and $Zc\bar{c}$ couplings have been measured directly, using the polar angle dependence of the polarized cross s…