New results on heavy quarks near threshold

Abstract

We review in brief the threshold expansion, a method to perform the expansion of Feynman integrals near the heavy quark-antiquark threshold, and its relation to the construction of two effective theories, non-relativistic QCD (NRQCD) and potential-NRQCD. We then summarize recent next-to-next-to-leading order results on the decay $J/\Psi \to l^{+}{l}^{-}$, the bottom quark mass from ${\rm Y}$ sum rules and the top-anti-top production cross section near threshold in $e^{+}{e}^{-}$ collisions.

arXiv commentTalk presented at the XXXIIIrd Rencontres de Moriond `Electroweak Interactions and Unified Theories', 14-21 March 1998, Les Arcs, France; 12 pages, LaTeX, 1 figures, .sty files included, (v2): mistyped CF CA term in Eq. (12) fixed

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