An improved measurement of the forward-backward asymmetry in Z → bb¯ decays is presented, based on a sample of 4.1 million hadronic Z decays collected by ALEPH between 1991 and 1995. Data are analysed as a function of polar angle of the event axis and b purity. The event tagging efficiency and mean b-jet hemisphere charge are measured directly from data. From the measured forward-backward jet charge asymmetry, the b quark asymmetry at √s = mZ is determined to be: AbAB = 0.1017 ± 0.0038(stat.) ± 0.0032(syst.) In the context of the Standard Model this corresponds to a value of the effective weak mixing angle of sin2θeffW = 0.23109 ± 0.00096.

Barate, R., Buskulic, D., Decamp, D., Ghez, P., Coy, C., Lees, J., et al. (1998). Determination of AbFBusing jet charge measurements in Z decays. PHYSICS LETTERS. SECTION B, 426(1-2), 217-230 [10.1016/S0370-2693(98)00345-1].

Determination of AbFBusing jet charge measurements in Z decays

CARPINELLI, Massimo;
1998

Abstract

An improved measurement of the forward-backward asymmetry in Z → bb¯ decays is presented, based on a sample of 4.1 million hadronic Z decays collected by ALEPH between 1991 and 1995. Data are analysed as a function of polar angle of the event axis and b purity. The event tagging efficiency and mean b-jet hemisphere charge are measured directly from data. From the measured forward-backward jet charge asymmetry, the b quark asymmetry at √s = mZ is determined to be: AbAB = 0.1017 ± 0.0038(stat.) ± 0.0032(syst.) In the context of the Standard Model this corresponds to a value of the effective weak mixing angle of sin2θeffW = 0.23109 ± 0.00096.
Articolo in rivista - Articolo scientifico
LUND MONTE-CARLO; E+E-PHYSICS; FRAGMENTATION
English
217
230
14
Barate, R., Buskulic, D., Decamp, D., Ghez, P., Coy, C., Lees, J., et al. (1998). Determination of AbFBusing jet charge measurements in Z decays. PHYSICS LETTERS. SECTION B, 426(1-2), 217-230 [10.1016/S0370-2693(98)00345-1].
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