$R_{had}$ at the $B$-factory

Abstract

A systematic theoretical evaluation of the cross section for hadron production in electron-positron collisions in the energy range just below the $B$ meson threshold is presented which includes charm and bottom mass effects and is accurate to order $\as^3$. The corresponding measurement in the energy region several $GeV$ above the threshold is also discussed.

report# TTP94-12. pages, LaTex (uses epsfig.sty, a figure appended as uuencoded eps-file). A complete postscript file, including the figure, is available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/pub/ttp94-12/ttp94-12.ps (129.13.102.139), Local preprint# TTP94-12

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