A GLOBAL FIT TO EXTENDED OBLIQUE PARAMETERS

The STU formalism of Peskin and Takeuchi is an elegant method for enco ding the measurable effects of new physics which couples to light ferm ions dominantly through its effects on electroweak boson propagation. However, this formalism cannot handle the case where the scale of new physics is not much larger than the weak scale. In this case three new parameters (V, W and X) are required. A global fit to precision elect roweak data for these six parameters is performed. Our results differ from what is found for just STU. In particular we find that the prefer ence for S < 0 is no longer statistically significant.