Ultrasoft contribution to heavy-quark pair production near threshold
arXiv:0804.4004 · doi:10.1016/j.physletb.2008.08.031
Abstract
We compute the third-order correction to the heavy-quark current correlation function due to the emission and absorption of an ultrasoft gluon. Our result supplies a missing contribution to top-quark pair production near threshold and the determination of the bottom quark mass from QCD sum rules.
10 pages, LaTeX