New Results on Perturbative Color Transparency in Quasi-Exclusive Electroproduction

TL;DR

This paper presents comprehensive perturbative QCD calculations of color transparency in quasi-exclusive electroproduction, showing scaling behavior at high momentum transfer and demonstrating the ratio's robustness against theoretical uncertainties.

Contribution

It provides the first full leading-order calculation including all subprocesses and Sudakov effects, enhancing understanding of color transparency in nuclear physics.

Findings

Scaling observed beyond Q^2=10 GeV^2

Color transparency ratio is insensitive to model uncertainties

Nuclear medium filtering simplifies calculations

Abstract

We review the perturbative QCD formalism of hadronic electromagnetic form factors and the color transparency ratio for quasi-exclusive electroproduction of the proton and pion from nuclear targets. We have completed the first full calculations including all leading order quark subprocesses and integrations over distribution amplitudes, including Sudakov effects. For the case of the proton, the calculated result shows scaling beyond $Q^2=10$ GeV$^2$. The calculation incorporating filtering due to the nuclear medium is cleaner than the corresponding calculation in free space because of attenuation of large distance amplitudes. We find that the color transparency ratio is rather insensitive to theoretical uncertainties inherent in the perturbative formalism, such as the choice of the hadron distribution amplitude.