Scientific article
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English

Measurements of the bb production cross section and forward–backward asymmetry at centre-of-mass energies above the Z pole at LEP

ContributorsL3 Collaboration
Published inPhysics letters. B, vol. 485, no. 1-3, p. 71-84
Publication date2000
Abstract

The measurements of Rb=σ(e+e-→bb)/ σ(e+e-→qq) and of the b quark forward–backward charge asymmetry, Afbb, at centre-of-mass energies above the Z pole are described. The measurement of Rb is performed at √s between 130 and 189 GeV using a b-tagging method that exploits the relatively large decay length of b-hadrons. The measurement of Afbb is performed using the large statistics event sample collected at √s=189 GeV with a lepton-tag analysis based on the selection of prompt muons and electrons. The results at at √s=189 GeV are Rb=0.163±0.013(stat.)±0.005(syst.), A b/fb=0.61±0.18(stat.)±0.09(syst.).

Citation (ISO format)
L3 Collaboration. Measurements of the bb production cross section and forward–backward asymmetry at centre-of-mass energies above the Z pole at LEP. In: Physics letters. B, 2000, vol. 485, n° 1-3, p. 71–84. doi: 10.1016/S0370-2693(00)00676-6
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Journal ISSN0370-2693
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