Indications for an Anomalous Right-Handed Coupling of the b-Quark from a Model Independent Analysis of LEP and SLD Data on Z-Decays
/ Authors
/ Abstract
A model independent analysis is made using the LEP and SLD data on Z decays available at the end of 1996. The effective weak coupling constants of leptons, c quarks and b quarks are extracted. Except for the right-handed b quark coupling, they all agree with the predictions of the Standard Electroweak Model for m t = 180 GeV and m H = 100 GeV. The right-handed b quark coupling is found to be 42% and 3.2 standard deviations above the Standard Model prediction.