Measurement of the forward - backward asymmetry of e+ e- ---> Z ---> b anti-b using prompt leptons and a lifetime tag
(1995) Zeitschrift für Physik. C, Particles and fields — Vol. 65, n° 4, p. 569-586 (1995)
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- et. al.
- Abstract
- The forward-backward asymmetry of the processe + e −→Z→b bbˉ has been measured using events collected by the DELPHI experiment during the 1991 and 1992 LEP runs. This data sample corresponded to 884 000 hadronicZ decays at a centre-of-mass energy s√∼MZ . The tagging of b-quark events was performed using two approaches; the first was based on the semileptonic decay channelsb→X+μ andb→X+e, the second used a lifetime tag with jet-charge reconstruction. The results of these two methods were combined to give AbbˉFB=0.107±0.011(stat.+syst.+mixing). With the semileptonic sample, the forward-backward asymmetry of the processe + e −→Z→ ccˉ was also measured to be AccˉFB=0.083±0.022(stat.)±0.016(syst.). The effective value of the Weinberg mixing angle derived from these measurements was sin2θlepeff=0.2294±0.0021.
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