The Next-to-Leading Order Corrections to Top Quark Decays to Heavy Quarkonia

TL;DR

This paper calculates NLO QCD corrections to top quark decays into heavy quarkonia, showing significant impact on decay widths and reduced theoretical uncertainties.

Contribution

It provides the first detailed NLO analysis of top quark decays into heavy quarkonia, improving accuracy over previous leading order estimates.

Findings

NLO corrections significantly alter decay widths.

QCD scale dependence is notably reduced at NLO.

Uncertainties in decay predictions are decreased.

Abstract

The decay widths of top quark to S-wave $b\bar{c}$ and $b\bar{b}$ bound states are evaluated at the next-to-leading(NLO) accuracy in strong interaction. Numerical calculation shows that the NLO corrections to these processes are remarkable. The quantum chromodynamics(QCD) renormalization scale dependence of the results are obviously depressed, and hence the uncertainties lying in the leading order calculation are reduced.