Semileptonic decays D →π+π-e+νe and Ds →π+π-e+νe as the probe of constituent quark-antiquark pairs in the light scalar mesons

Decays D→π+π-e+νe and Ds→π+π-e+νe serve as probes that check the existence of constituent qq components in the wave functions of scalar mesons decaying into π+π-. 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 q2q2 model validity for light scalars on ever new processes seems extremely interesting and important. We analyze the BESIII and CLEO data on the decays D+→π+π-e+νe and Ds+→π+π-e+νe and show that the results of these experiments together can be interpreted in favor of the four-quark nature of light scalar mesons σ(500) and f0(980). Our approach can also be applied to the description of other similar decays involving light scalars.