[SLAC] [SLAC Pubs and Reports]

SLAC-PUB-8201
New Measurement of Ab at the Z0 Resonance using a Vertex-Charge Technique.

Abstract

\noindent We present a new preliminary measurement of the parity-violation parameter $A_b$ using a self-calibrating vertex-charge technique. In the SLD experiment we observe hadronic decays of $Z^0$ bosons produced in collisions between longitudinally polarized electrons and unpolarized positrons at the SLAC Linear Collider. A sample of $b\bar{b}$ events is selected using the topologically reconstructed mass of $B$ hadrons. From our 1996--1998 data sample of %11,092 $e^+e^-\rightarrow$\,\zbbar\ candidates, approximately 400,000 hadronic $Z^0$ decays, we obtain $A_b=0.897 \pm 0.027 (\mbox{stat})^{+0.036}_{-0.034} (\mbox{syst})$. %Together with our previous 1993--1995 result, it yields %a preliminary combined SLD jet-charge measurement of: %$A_b=0.849 \pm 0.026 (\mbox{stat}) \pm 0.031 (\mbox{syst})$.

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