Ultrasoft contribution to heavy-quark pair production near threshold
classification
✦ hep-ph
keywords
contributionheavy-quarknearpairproductionthresholdultrasoftabsorption
read the original 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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