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Measurement of the asymmetry ofb quark production ine+e− annihilation at $$\sqrt s = 35 GeV$$

W. Braunschweig,R. Gerhards,F. J. Kirschfink,H.-U. Martyn,H. M. Fischer,H. Hartmann,J. Hartmann,E. Hilger,A. Jocksch,R. Wedemeyer, B. Foster,A. J. Martin,E. Bernardi,J. Chwastowski,A. Eskreys,K. Genser,H. Hultschig,P. Joos,H. Kowalski,A. Ladage,B. Löhr, D. Lüke,P. Mättig,D. Notz,J. M. Pawlak,K.-U. Pösnecker,E. Ros,D. Trines, R. Walczak,G. Wolf, H. Kolanoski,J. Krüger,E. Lohrmann,G. Poelz, W. Zeuner,D. Binnie,J. Hassard,J. Shulman, D. Su,I. Tomalin,A. Watson,F. Barreiro,G. Cases,L. Hervas,J. del Peso,M. G. Bowler,P. N. Burrows,R. J. Cashmore,M. E. Veitch,J. C. Hart,D. H. Saxon,S. Brandt, M. Holder,Y. Eisenberg,U. Karshon,A. Montag,D. Revel,E. Ronat,N. Wainer,A. Caldwell,D. Muller,S. Ritz,D. Strom,M. Takashima,Sau Lan Wu, G. Zobernig

msra（1990）

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摘要
The forward-backward asymmetry in the reaction e+e-→bb has been determined at centre of mass energies near 35 GeV using the TASSO detector. We report results from three different methods. The combined result of the measurements is $$\overline A _b = - 0.21 \pm 0.08$$ ignoring $$B^0 \bar B^0 $$ mixing. Taking mixing into account leads to a corrected asymmetry of $$\overline {A_b^{cor} } = - 0.28 \pm 0.11$$ . The axial vector coupling constant of theb quark as calculated from the corrected asymmetry isab=−1.2±0.5 to be compared with the valueabSM=−1 from the standard model.
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