Measurement of the Parity-Violation Parameters $A_{b}$ and $A_{c}$ from the Left-Right Forward-Backward Asymmetry of Leptons in Hadronic Events at the $Z^{0}$ Resonance

Publisher Website

10 April 1995

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 74 (15) , 2895-2899
https://doi.org/10.1103/physrevlett.74.2895

Abstract

The parity-violating parameters

A_{b}

and

A_{c}

are directly measured by the SLD experiment at the SLAC Linear Collider in

e^{+} e^{-}

collisions with polarized electrons at the

Z^{0}

resonance. Leptons with distinctive total and transverse momenta are used to select and analyze

Z^{0} \to b \bar{b}

and

Z^{0} \to c \bar{c}

events.

A_{b}

and

A_{c}

are extracted by forming the left-right forward-backward asymmetry in electron beam polarization and quark polar angle. From our 1993 sample of 1.8 p

b^{- 1}

of

Z^{0}

decay data with an average electron beam polarization of 63% we find

A_{b} = 0.91 \pm 0.14

(stat)

\pm 0.07

(syst) and

A_{c} = 0.37 \pm 0.23

(stat)

\pm 0.21

(syst).

Keywords

This publication has 14 references indexed in Scilit:

Measurement of the Parity-Violation Parameter $A_{b}$ from the Left-Right Forward-Backward Asymmetry of $b$ Quark Production in $Z^{0}$ Decays Using a Momentum-Weighted Track-Charge Technique
Physical Review Letters, 1995
Precise Measurement of the Left-Right Cross Section Asymmetry in $Z$ Boson Production by $e^{+} e^{-}$ Collisions
Physical Review Letters, 1994
The lead-liquid argon sampling calorimeter of the SLD detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1993
Radiative corrections to $B (Z \to b \bar{b})$ in the minimal supersymmetric standard model
Physical Review D, 1991
Measurement of the branching fractions for $D^{0}$ → $π^{-}$ $e^{+}$ $ν_{e}$ and $D^{0}$ → $K^{-}$ $e^{+}$ $ν_{e}$ and determination of ‖ $V_{cd}$ / $V_{cs}$ $‖^{2}$
Physical Review Letters, 1989
The iron calorimeter and muon identifier for SLD
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1989
SemileptonicBandDdecays in the quark model
Physical Review D, 1989
The Lund Monte Carlo for jet fragmentation and e+ e- physics - jetset version 6.3 - an update
Computer Physics Communications, 1987
Experimental studies on multijet production ine + e ? annihilation at PETRA energies
The European Physical Journal C, 1986
Semileptonic Decays on the $D$ Meson
Physical Review Letters, 1979