Evidence of the four-quark nature of f0(980) and f0(500)

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)(q) over bar (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 -> gamma pi(0)pi(0) and show that the results of this high-statistics experiment can be interpreted in favor of the fourquark nature of light scalar mesons f(0)(980) and f(0)(500).

Automated summary

The study suggests that light scalar mesons may have an exotic four-quark nature and further expansion of their model validity area is significant.