Rb and Heavy Quark Mixing

Details Rb and Heavy Quark Mixing Rb and Heavy Quark Mixing

1996-06-04

arxiv.org/abs/hep-ph/9606227v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 2 figures, Latex, uses sprocl.sty and epsf.tex, Talk given at the 18th annual MRST meeting, Toronto, May 9-10, 1996;

Scientific paper

In this talk I summarize a part of the work done in a recent collaboration with C. Burgess, J. Cline, D. London and E. Nardi \cite{b96}. We analyze the observed discrepancy between $R_b(\equiv\gb /\ghad )$ as measured at LEP and its standard model value for signals of new physics. The focus is thereby put on new physics that manifests itself through heavy quark mixing. Heavy quark mixing affects the measured value of $R_b$ in two ways: at tree level (bottom mixing) and at one-loop level (top mixing). One finds that whereas the latter cannot account for the deviation, bottom mixing can in principle do the job.

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