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T: Fachverband Teilchenphysik

T 16: QCD theory I

T 16.6: Vortrag

Montag, 30. März 2020, 17:45–18:00, H-ÜR 1

Matching coefficients in nonrelativistic QCD to two-loop accuracy — •Marvin Gerlach¹, Go Mishima², and Matthias Steinhauser¹ — ¹Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede Straße 1, 76128 Karlsruhe, Germany — ²Institut für Kernphysik, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

Nonrelativistic QCD (NRQCD) describes the system of two heavy quarks with mass m_Q in the limit of small relative velocity, v. It is constructed by a double expansion in α_s and v (of 1/m_Q). In this talk we present results for various two-loop matching coefficients for operators which contribute at order 1/m_Q². The results are building blocks for next-to-next-to-next-to-leading logarithmic and next-to-next-to-next-to-next-to-leading order corrections to the threshold production of top quark pairs and the decay of heavy quarkonia.