# TTP04-22 Recent Developments in the Treatment of Heavy Quarks

TTP04-22 Recent Developments in the Treatment of Heavy Quarks

TTP04-22 Recent Developments in the Treatment of Heavy Quarks

We discuss new results obtained for the description of a system of

 two heavy
quarks close to the production threshold. Special emphasis is put
on the resummation of logarithms in the quark velocity.
As physical applications we discuss the determination of the
mass of the $\eta_b$ meson and the ratio of the photon mediated
production or annihilation rates of spin triplet and spin singlet
heavy quarkonium states.
 M. Steinhauser AIP Conf.Proc 756 357-359 2005 PDF PostScript