Speaker
Tianyang Hu
(Institute of Modern Physics, CAS)
Description
We investigate the internal stress of charmonium using the recently derived light-front wave function representation. We employ three “good components” of the energy-momentum tensor, $T^{++}$, $T^{+-}$, and $T^{12}$, to extract the gravitational form factors. The obtained form factors satisfy the known constraints and are used to derive the physical distributions of the system. We discover tantalizing evidence of a tachyonic core within $\eta_c$. Additionally, we find an attractive core within $\chi_{c0}$, contradicting the speculation based on mechanical stability that a stable system must have a repulsive core.
Authors
Tianyang Hu
(Institute of Modern Physics, CAS)
Xianghui Cao
(University of Science and Technology of China)
Siqi Xu
Yang Li
(University of Science and Technology of China)
Xingbo Zhao
(Institute of Modern Physics, Chinese Academy of Sciences)
James P. Vary
