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Measurement of the forward-backward asymmetry of e+e-→Z→ {Mathematical expression} using prompt leptons and a lifetime tag

par Abreu, Pedro;Bertrand, Daniel ;Braibant, Sylvie J.S.J. ;Bricman, Charles ;Cao, Futian;Daubie, Evelyne;De Boeck, Hugo;De Brabandere, S.;De Clercq, Catherine;Grard, Fernand ;Herquet, Philippe ;Huet, Kathy;Lemonne, Jacques ;Tomaradze, A.;Vander Velde, Catherine ;Van Doninck, Walter;Verbeure, F;Wickens, John H. ; [et al.]
Référence Zeitschrift für Physik. C, Particles and fields, 65, 4, page (569-585)
Publication Publié, 1995-12

Article révisé par les pairs

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Résumé :

The forward-backward asymmetry of the process e+e-→Z→b {Mathematical expression} has been measured using events collected by the DELPHI experiment during the 1991 and 1992 LEP runs. This data sample corresponded to 884 000 hadronic Z decays at a centre-of-mass energy {Mathematical expression}. The tagging of b-quark events was performed using two approaches; the first was based on the semileptonic decay channels b→X+μ and b→X+e, the second used a lifetime tag with jet-charge reconstruction. The results of these two methods were combined to give {Mathematical expression} With the semileptonic sample, the forward-backward asymmetry of the process e+e-→Z→ {Mathematical expression} was also measured to be {Mathematical expression} The effective value of the Weinberg mixing angle derived from these measurements was {Mathematical expression} © 1995 Springer-Verlag.