A key issue in making precise predictions in QCD is the uncertainty in setting the
renormalization scale μ r and thus determining the correct values of the QCD running …

The conventional scale setting approach to fixed-order perturbative QCD (pQCD)
predictions is based on a guessed renormalization scale, usually taking as the one to …

We consider the problem of quantifying the uncertainty on theoretical predictions based on
perturbation theory due to missing higher orders. The most widely used approach, scale …

In addition to the evaluation of high-order loop contributions, the precision and predictive
power of perturbative QCD (pQCD) predictions depends on two important issues:(1) how to …

The intrinsic conformality (iCF) is a general property of the renormalizable gauge theory,
which ensures the scale invariance of a fixed-order series at each perturbative order …

A bstract In this paper, we calculate the next-to-next-to-leading-order (NNLO) QCD
corrections to e+ e−→ J/ψ+ η c at the B factories. After including the NNLO corrections, the …

As a basic requirement of the renormalization group invariance, any physical observable
must be independent of the choice of both the renormalization scheme and the initial …

The quantum chromodynamics (QCD) coupling α s is the most important parameter for
achieving precise QCD predictions. By using the well measured effective coupling ${\alpha} …

A bstract We present a novel method for precisely determining the QCD running coupling
from R uds measurements in electron-positron annihilation. When calculating the fixed-order …

A bstract In the paper, we present QCD predictions for γ+ η c production at an electron-
positron collider up to next-to-next-to-leading order (NNLO) accuracy without …