Cross-Section Asymmetries Around the $Z$ Peak

Abstract

A simple model-independent formula for cross-section asymmetries $A$ in fermion-pair production is derived, which may be used for the analysis of LEP~1 data, $A={\sum }_n{A}_n(s-M_Z^2{)}^n$. The coefficient $A_0$ depends on the $Z$ boson exchange, $A_1$ additionally on the $\gamma Z$ interference, while the higher-order contributions are practically redundant. QED corrections are taken into account, and relations to other approaches are indicated.

Comments: 8 pages (LaTeX), 1 table, a uuencoded file containing the LaTeX file is available via anonymous ftp at //ftp.ifh.de/pub/preprint/cernth92-6590.uu paper is published in Phys. Letters B