Rb and New Physics: A Comprehensive Analysis
J. M. Cline
Abstract
I summarize work done with Bamert, Burgess, Nardi and London in which we examine the effects of new physics on Rb. Our work facilitates the identification of such new physics in case the present two-sigma deviation of Rb from its Standard Model value should persist, or alternatively it helps to constrain new physics in case the discrepancy continues to disappear. We consider two general classes of effects: mixing of the b or t quarks with heavy, exotic quarks, and loop corrections to the Zb b vertex. Our aim was to give an analysis which is as exhaustive and as model-independent as possible.
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