Study of light scalar mesons through D + s → π0π0e + νe and K0 S K0 S e + νe decays

Using 6.32 fb(-1) of e(+)e(-) collision data recorded by the BESIII detector at center-of-mass energies between 4.178 to 4.226 GeV, we present the first measurement of the decay D-s(+) -> f(0)(980)e(+)nu(e), f(0)(980) -> pi(0)pi(0). The product branching fraction of D-s(+) -> f(0)(980)e(+)nu(e), f(0)(980) -> pi(0)pi(0) is measured to be (7.9 +/- 1.4(stat) +/- 0.4(syst)) x 10(-4), with a statistical significance of 7.8 sigma. Furthermore, the upper limits on the product branching fractions of D-s(+) -> f(0)(500)e(+)nu(e) with f(0)(500) -> pi(0)pi(0) and the branching fraction of D-s(+) -> K(S)(0)K(S)(0)e(+)nu(e) are set to be 7.3 x 10(-4) and 3.8 x 10(-4) at 90% confidence level, respectively. Our results provide valuable inputs to the understanding of the structures of light scalar mesons.