A new measurement of the forward-backward asymmetry in Z--> bb decays is presented. Hadrons from b decays are tagged using their long lifetimes. The b quark charge and direction are reconstructed with a hemisphere charge algorithm. The asymmetry and reconstructed b hemisphere charge are measured in the 69 pb-1 of data collected by ALEPH during 1991, 1992 and 1993. They are used to extract sin2θWeff, which is determined to be 0.2315 +/- 0.0016 (stat.) +/- 0.0009 (syst.), corresponding to an AFBb of 0.0992 +/- 0.0084 (stat.) +/- 0.0046 (syst.).

A measurement of AFBb in lifetime tagged heavy flavour Z decays / Buskulic, D., Casper, D., de Bonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J.P., Minard, M.N., Odier, P., Pietrzyk, B., Ariztizabal, F., Chmeissani, M., Crespo, J.M., Efthymiopoulos, I., Fernandez, E., Fernandez Bosman, M., Gaitan, V., Garrido, L.l., Martinez, M., Mattison, T., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 335:(1994), pp. 99-108. [10.1016/0370-2693(94)91564-4]

A measurement of AFBb in lifetime tagged heavy flavour Z decays

GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
1994-01-01

Abstract

A new measurement of the forward-backward asymmetry in Z--> bb decays is presented. Hadrons from b decays are tagged using their long lifetimes. The b quark charge and direction are reconstructed with a hemisphere charge algorithm. The asymmetry and reconstructed b hemisphere charge are measured in the 69 pb-1 of data collected by ALEPH during 1991, 1992 and 1993. They are used to extract sin2θWeff, which is determined to be 0.2315 +/- 0.0016 (stat.) +/- 0.0009 (syst.), corresponding to an AFBb of 0.0992 +/- 0.0084 (stat.) +/- 0.0046 (syst.).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2563401
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