Christopher
Monahan (Cambridge):
Perturbative Renormalisation of the Lattice NRQCD Action
Abstract:
Precise nonperturbative
predictions of heavy quark bound states are required
to constrain the fundamental parameters of the Standard
Model. Lattice QCD offers the only available method
for nonperturbative QCD calculations. However present
lattice spacings are too coarse to simulate heavy
quarks directly. An effective nonrelativistic theory
(NRQCD) is used to discretise the heavy degrees
of freedom. Current lattice simulations are sufficiently
precise that oneloop contributions to treelevel
quantities are significant. We calculate the oneloop
renormalisation of the heavy quark propagator NRQCD
using automated lattice perturbation theory. We
also present the oneloop corrections to the higher
order kinetic terms of the NRQCD action.
