Corrections to Quark Asymmetries at LEP

Abstract

The most precise measurement of the weak mixing angle sin^2(theta) at LEP is from the forward-backward asymmetry e+e- --> bbbar at the Z-pole. In this note the QED and electroweak radiative corrections to obtain the pole asymmetry from the measured asymmetry for b- and c-quarks have been calculated using ZFITTER, which has been amended to allow a consistent treatment of partial two-loop corrections for the b-quark final asymmetries. A total correction of dAfbb=0.0019+/-0.0002 and dAfbc=0.0064+/-0.0001 has been found, where the remaining theoretical uncertainty is much too small to explain the apparent discrepancy between sin^2(theta) obtained from Afbb and from the left-right asymmetry at SLD.

References in corpus (7)

• ZFITTER v.6.21 - A Semi-Analytical Program for Fermion Pair Production in e+e- Annihilation
• Complete fermionic two-loop results for the M_W-M_Z interdependence
• Three Loop Top Quark Contributions to the rho Parameter
• Two-loop heavy top effects on the MZ-MW interdependence
• Complete Two-Loop Electroweak Fermionic Corrections to sin^2(theta_eff) and Indirect Determination of the Higgs Boson Mass
• Complete Two Loop Bosonic Contributions to the Muon Lifetime in the Standard Model
• TOPAZ0 4.0 - A new version of a computer program for evaluation of de-convoluted and realistic observables at LEP 1 and LEP 2

Cited by in corpus (12)

• Precision Electroweak Measurements on the Z Resonance
• ZFITTER: a semi-analytical program for fermion pair production in e+e- annihilation, from version 6.21 to version 6.42
• Electroweak two-loop corrections to the effective weak mixing angle
• Two-loop electroweak fermionic corrections to sin^2 theta_{eff}^{b anti-b}
• Two-Parton Contribution to the Heavy-Quark Forward-Backward Asymmetry in NNLO QCD
• Unparticle Physics and A_{FB}^b on the Z pole
• Determination of A_{FB}^b at the Z pole using inclusive charge reconstruction and lifetime tagging
• Experimental Precision Tests for the Electroweak Standard Model
• Top and bottom quark forward-backward asymmetries at next-to-next-to-leading order QCD in (un)polarized electron positron collisions
• Revised QCD effects on the $Z\to b\bar{b}$ forward-backward asymmetry in $e^{+}{e}^{-}$ collisions
• Two-parton contribution to the heavy-quark A_FB at NNLO QCD in e+e- collisions
• Forward-backward asymmetries of the heavy quark pair production in $e^{+}{e}^{-}$ collisions at $\mathcal{O}({\alpha }_s^2)$