Pion gravitational form factors in the QCD instanton vacuum II
High Energy Physics - Phenomenology
2024-10-16 v1 High Energy Physics - Theory
Nuclear Theory
Abstract
We revisit the hard QCD contributions to the pion gravitational form factors (GFFs), in terms of the twist-2,3 pion distribution amplitudes (DA), including novel semi-hard contributions from the instantons. The pion DAs are evaluated in the QCD instanton vacuum, and then properly evolved to higher resolution. The results are compared to our recent results from the QCD instanton vacuum, as well as Bethe-Salpeter calculations and recent lattice data. The interpolated hard and soft contributions to the pion D-form-factor, are used to derive the (gravitational) pressure and shear within the pion, with a clear delineation of their range.
Cite
@article{arxiv.2405.16269,
title = {Pion gravitational form factors in the QCD instanton vacuum II},
author = {Wei-Yang Liu and Edward Shuryak and Ismail Zahed},
journal= {arXiv preprint arXiv:2405.16269},
year = {2024}
}
Comments
14 pages, 6 figures