Speaker
Yukinari Sumino
(Tohoku University)
Description
We calculate the Hamiltonian of a heavy quarkonium system at two loops of
potential-NRQCD effective field theory (Non-annihilation channel).
We compute the quark-antiquark scattering amplitude in the non-annihilation
channel up to two loops in QCD, in the non-relativistic region in expansion in
beta. Then we match it to the scattering amplitude in potential-NRQCD.
We develop a method by combining threshold expansion and differential
equations for calculating the beta expansions of the master integrals.
Primary author
Yukinari Sumino
(Tohoku University)
