Instanton effects on electromagnetic transitions of charmonia
Abstract
We investigate the mass spectrum and electromagnetic transitions of charmonia, emphasizing the instanton effects on them. The heavy-quark potential consists of the Coulomb-like potential from one-gluon exchange and the linear confining potential. We introduce the nonperturbative heavy-quark potential derived from the instanton vacuum. We also consider the screened confining potential, which better describes the electromagnetic decays of higher excited states. Using this improved heavy-quark potential, we compute the mass spectrum and electromagnetic decays of the charmonia. Focusing on the instanton effects, we discuss the results compared with the experimental data and those from other works. The instanton effects are marginal on the electromagnetic decays of charmonia.
Keywords
Cite
@article{arxiv.2208.01851,
title = {Instanton effects on electromagnetic transitions of charmonia},
author = {Ki-Hoon Hong and Ulugbek Yakhshiev and Hyun-Chul Kim},
journal= {arXiv preprint arXiv:2208.01851},
year = {2022}
}
Comments
10 pages and 4 figures. The final version to be published in Progress of Theoretical and Experimental Physics