Cargando…

New results on heavy quarks near threshold

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-lead...

Descripción completa

Detalles Bibliográficos
Autor principal: Beneke, M.
Lenguaje:eng
Publicado: 1998
Materias:
Acceso en línea:http://cds.cern.ch/record/357901
Descripción
Sumario: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 $\Upsilon$ sum rules and the top-anti-top production cross section near threshold in $e^+ e^-$ collisions.