Soft and Hard scale QCD Dynamics in Mesons

TL;DR

This paper extends a soft scale QCD model to heavy mesons, analyzing their masses, decay constants, and quark distributions, and compares the constituent mass approach with dressed propagators for heavy quarks.

Contribution

It applies a ladder-rainbow kernel to heavy mesons and assesses the constituent mass approximation versus dressed propagators in QCD modeling.

Findings

Effective description of heavy meson properties using the ladder-rainbow truncation.

Validation of constituent mass concept for heavy quark modeling.

Insights into quark distributions in pion and kaon from Dyson-Schwinger equations.

Abstract

Using a ladder-rainbow kernel previously established for the soft scale of light quark hadrons, we explore the extension to masses and electroweak decay constants of ground state pseudoscalar and vector quarkonia and heavy-light mesons in the c- and b-quark regions. We make a systematic study of the effectiveness of a constituent mass concept as a replacement for a heavy quark dressed propagator. The difference between vector and axial vector current correlators is examined to estimate the four quark chiral condensate. The valence quark distributions, in the pion and kaon, defined in deep inelastic scattering, and measured in the Drell Yan process, are investigated with the same ladder-rainbow truncation of the Dyson-Schwinger and Bethe-Salpeter equations.