The sample of hadronic Z decays collected by the Aleph detector at Lep in the years 1991-1995 is analysed in order to measure the forward-backward asymmetry in and events and the average mixing parameter . Quark charges are tagged by the charges of electrons and muons produced in and semileptonic decays. Multivariate analyses are used to separate the event flavours and / processes. The and quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be χ¯=0.1196±0.0049(stat.)+0.0043−0.0050(syst.),A0,bFB=0.0998±0.0040(stat.)±0.0017(syst.),A0,cFB=0.0732±0.0053(stat.)±0.0037(syst) These asymmetries, combined with the Aleph measurements of the asymmetry using inclusive hadron decays and of the asymmetry using reconstructed mesons, correspond to a value of the effective electroweak mixing angle of sin2θeffW=0.23188±0.00046.

Measurement of the forward-backward asymmetry in Z -> b(b)over-bar and Z -> c(c)over-bar decays with leptons / Heister, A., Schael, S., Barate, R., De Bonis, I., Focardi, E., Goy, C., Lees, J.P., Merle, E., Minard, M.N., Pietrzyk, B., Boix, G., Bravo, S., Casado, M.P., Chmeissani, M., Crespo, J.M., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., Martinez, M., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 24:(2002), pp. 177-191. [10.1007/s100520200950]

Measurement of the forward-backward asymmetry in Z -> b(b)over-bar and Z -> c(c)over-bar decays with leptons

FOCARDI, ETTORE;CIULLI, VITALIANO;
2002

Abstract

The sample of hadronic Z decays collected by the Aleph detector at Lep in the years 1991-1995 is analysed in order to measure the forward-backward asymmetry in and events and the average mixing parameter . Quark charges are tagged by the charges of electrons and muons produced in and semileptonic decays. Multivariate analyses are used to separate the event flavours and / processes. The and quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be χ¯=0.1196±0.0049(stat.)+0.0043−0.0050(syst.),A0,bFB=0.0998±0.0040(stat.)±0.0017(syst.),A0,cFB=0.0732±0.0053(stat.)±0.0037(syst) These asymmetries, combined with the Aleph measurements of the asymmetry using inclusive hadron decays and of the asymmetry using reconstructed mesons, correspond to a value of the effective electroweak mixing angle of sin2θeffW=0.23188±0.00046.
2002
24
177
191
Heister, A.; Schael, S.; Barate, R.; De Bonis, I.; Focardi, Ettore; Goy, C.; Lees, J. P.; Merle, E.; Minard, M. N.; Pietrzyk, B.; Boix, G.; Bravo, S.;...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/352296
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