# Measurements of the $b\overline{b}$ production cross section and forward- backward asymmetry at centre-of-mass energies above the Z pole at LEP

Abstract : The measurements of Rb = sigma(e+e- -> bb~)/sigma(e+e- -> qq~) and of the b quark forward-backward charge asymmetry, A^b_fb, at centre-of-mass energies above the Z pole are described. The measurement of Rb is performed at \root{s} between 130 and 189 GeV using a b-tagging method that exploits the relatively large decay length of b-hadrons. The measurement of A^b_fb is performed using the large statistics event sample collected at \root{s}=189 GeV with a lepton-tag analysis based on the selection of prompt muons and electrons. The results at \root{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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Journal articles

Cited literature [20 references]

https://hal.in2p3.fr/in2p3-00005352
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Submitted on : Monday, July 24, 2000 - 12:08:45 PM
Last modification on : Tuesday, January 25, 2022 - 9:30:30 AM
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### Citation

M. Acciarri, P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz, et al.. Measurements of the $b\overline{b}$ production cross section and forward- backward asymmetry at centre-of-mass energies above the Z pole at LEP. Physics Letters B, Elsevier, 2000, 485, pp.71-84. ⟨10.1016/S0370-2693(00)00676-6⟩. ⟨in2p3-00005352⟩

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