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

CollaborationWith : Achard, Pablo / Ambrosi, Giovanni / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Pohl, Martin / Sciarrino, Deborah
Published in Physics Letters. B. 2000, vol. 485, no. 1-3, p. 71-84
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.).
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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. https://archive-ouverte.unige.ch/unige:47340

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Deposited on : 2015-02-27

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