On the PQCD prediction for the pion form factor
B. Melic, B. Nizic, K. Passek
TL;DR
This paper analyzes the leading-twist NLO QCD predictions for the pion electromagnetic form factor at high momentum transfer, highlighting the scale sensitivity and the feasibility of reliable perturbative calculations at Q of 5-10 GeV.
Contribution
It provides a detailed NLO QCD analysis of the pion form factor, emphasizing the impact of renormalization scale choices and the conditions for reliable perturbative predictions.
Findings
Perturbative predictions are reliable at Q of 5-10 GeV.
The size of radiative corrections depends on the renormalization scale.
Predictions are sensitive to the asymptotic distribution amplitude.
Abstract
We comment on the results of a complete leading-twist next-to-leading order QCD analysis of the spacelike pion electromagnetic form factor at large-momentum transfer Q. For the asymptotic distribution amplitude, we have examined the sensitivity of the predictions to the choice of the renormalization scale. The results show that, regarding the size of the radiative corrections, reliable perturbative predictions for the pion electromagnetic form factor can already be made at a momentum transfer Q of the order of 5 to 10 GeV.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research