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Improved direct measurement of the parity-violation parameter Ab using a mass tag and momentum-weighted track charge |
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| Authors: | Abe Kenji Abe Koya Abe T Adam I Akimoto H Aston D Baird K G Baltay C Band H R Barklow T L Bauer J M Bellodi G Berger R Blaylock G Bogart J R Bower G R Brau J E Breidenbach M Bugg W M Burke D Burnett T H Burrows P N Calcaterra A Cassell R Chou A Cohn H O Coller J A Convery M R Cook V Cowan R F Crawford G Damerell C J S Daoudi M de Groot N de Sangro R Dong D N Doser M Dubois R Erofeeva I Eschenburg V Fahey S Falciai D Fernandez J P Flood K Frey R Hart E L Hasuko K Hertzbach S S Huffer M E Huynh X Iwasaki M Jackson D J Jacques P Jaros J A Jiang Z Y Johnson A S Johnson J R Kajikawa R Kalelkar M |
| Institution: | Nagoya University, Chikusa-ku, Nagoya, 464 Japan. |
| Abstract: | 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). |
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