New Directions in Quantum Chromodynamics

TL;DR

This paper reviews recent theoretical developments in QCD, focusing on light-cone formalism, factorization, diffractive interactions, and conformal symmetry, to improve understanding and predictions of hadronic processes.

Contribution

It introduces new insights into light-cone wavefunctions, factorization schemes, and conformal symmetry applications, advancing the theoretical framework of QCD.

Findings

Light-cone Fock state representation encodes hadron correlations.

Light-cone factorization scheme improves process calculations.

Conformal symmetry provides scale-invariant QCD predictions.

Abstract

Several topics in QCD are reviewed, including: the light-cone Fock state representation, which encodes the flavor, spin and other quark and gluon correlations of hadrons in the form of universal process-independent amplitudes; the light-cone factorization scheme for inclusive and exclusive processes; the application of the light-cone formalism to semi-leptonic B decay amplitudes; self-resolving diffractive interactions as a tool for measuring light-cone wavefunctions; and the use of conformal symmetry as a template for QCD predictions, such as commensurate scale relations, which relate observable to observable at fixed relative scale without renormalization scale or scheme ambiguities.