Corrections to quark asymmetries at LEP
Fermi National Accelerator Laboratory, IL 60510-500, Batavia, USA
2 Deutsches Elektronen-Synchrotron DESY, Platanenallee 6, 15738, Zeuthen, Germany
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The most precise measurement of the weak mixing angle at LEP is from the forward-backward asymmetry 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 and has been found, where the remaining theoretical uncertainty is much too small to explain the apparent discrepancy between obtained from A FB b and from the left-right asymmetry at SLD.
© Springer-Verlag, 2005