Improved direct measurement of the parity-violation parameter Ab using a mass tag and momentum-weighted track charge.
نویسندگان
چکیده
We present an improved direct measurement of the parity-violation parameter A(b) in the Z boson-b-quark coupling using a self-calibrating track-charge technique applied to a sample enriched in Z-->bb events via the topological reconstruction of the B hadron mass. Manipulation of the Stanford Linear Collider electron-beam polarization permits the measurement of A(b) to be made independently of other Z-pole coupling parameters. From the 1996-1998 sample of 400,000 hadronic Z decays, produced with an average beam polarization of 73.4%, we find A(b)=0.906+/-0.022(stat)+/-0.023(syst).
منابع مشابه
Improved Direct Measurement of the Parity-Violation Parameter Ab Using a Mass Tag and Momentum-Weighted Track Charge
We present an improved direct measurement of the parity-violation parameter Ab in the Z boson–b quark coupling using a self-calibrating track-charge technique applied to a sample enriched in Z → bb̄ events via the topological reconstruction of the B hadron mass. Manipulation of the SLC electron-beam polarization permits the measurement of Ab to be made independently of other Z-pole coupling para...
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ورودعنوان ژورنال:
- Physical review letters
دوره 90 14 شماره
صفحات -
تاریخ انتشار 2003