Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-09-14
Phys.Rev.D63:032005,2001
Physics
High Energy Physics
High Energy Physics - Experiment
36 pages 8 figures Latex, Submitted to Physical Review D
Scientific paper
10.1103/PhysRevD.63.032005
We present a direct measurement of the parity-violation parameter $A_c$ in the coupling of the $Z^0$ to $c$-quarks with the SLD detector. The measurement is based on a sample of 530k hadronic $Z^0$ decays, produced with a mean electron-beam polarization of $|P_e| = 73 %$. The tagging of $c$-quark events is performed using two methods: the exclusive reconstruction of $D^{\ast+}$, $D^+$, and $D^0$ mesons, and the soft-pions ($\pi_s$) produced in the decay of $D^{\ast+}\to D^0 \pi_s^+$. The large background from $D$ mesons produced in $B$ hadron decays is separated efficiently from the signal using precision vertex information. The combination of these two methods yields $A_c = 0.688 \pm 0.041.$
Abe Kanshi
The SLD Collaboration
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