Ultrasoft contribution to heavy-quark pair production near threshold
M. Beneke (RWTH Aachen U.), Y. Kiyo (Karlsruhe U.)
TL;DR
This paper calculates a crucial third-order correction involving ultrasoft gluons, enhancing the precision of heavy-quark pair production models near threshold and aiding in accurate quark mass determinations.
Contribution
It provides the first computation of the ultrasoft gluon correction at third order for heavy-quark pair production near threshold.
Findings
Completes the missing third-order ultrasoft correction
Improves theoretical predictions for top-quark pair production
Aids in precise bottom quark mass determination
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.
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