New evidence of the four-quark nature of $f_0(980)$ and $f_0(500)$

N. N. Achasov, J. V. Bennett, A. V. Kiselev, E. A. Kozyrev, G. N. Shestakov

Published 2020-09-09Version 1

There exists a great deal of concrete evidence in favor of the exotic four-quark nature of light scalars. At the same time, the further expansion of the area of the $q^2\bar q^2$ model validity for light scalars on ever new processes seems extremely interesting and important. We analyze the BESIII data on the decay $J/\psi\to \gamma\pi^0\pi^0$ and show that the results of this high-statistics experiment can be interpreted in favor of the four-quark nature of light scalar mesons $f_0(980)$ and $f_0(500)$.