Study of light scalar mesons through Ds+ → π0π0e+νe and KS0KS0e+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.

Automated summary

In this study, using data recorded by the BESIII detector, the first measurement of a specific decay branching fraction is presented, with a statistical significance of 7.8 sigma. Additionally, upper limits on other decay branching fractions are set, providing valuable insights into the structures of light scalar mesons.