Measurement of $A_c$ with charmed mesons at SLD

Details Measurement of $A_c$ with charmed mesons at SLD Measurement of $A_c$ with charmed mesons at SLD

1999-07-20

arxiv.org/abs/hep-ex/9907039v1

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages 4 figures Latex. Contributed to EPS99 and to Lepton-Photon99

Scientific paper

We present a direct measurement of the parity-violation parameter A_c. The measurement is based on 550k Z^0 decays collected by the SLD detector. The mean electron-beam polarization is |P_e| = 73 %. The tagging of c-quark events was performed using two methods: The exclusive reconstruction of D^*+, D^+, and D^0 mesons, and the inclusive P_T spectrum of soft-pions (pi_s) in the decay of D^*+ -> D^0 pi_s^+. The results of these two methods are combined to give A_c = 0.688 +- 0.035(stat.) +- 0.025(sys.) (preliminary).

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