Search for the decay Ds+ →a0 (980)0e+νe

Abstract

Using 6.32 fb-1 of electron-positron collision data recorded by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, we present the first search for the decay Ds+→a0(980)0e+νe, a0(980)0→π0η, which could proceed via a0(980)-f0(980) mixing. No significant signal is observed. An upper limit of 1.2×10-4 at the 90% confidence level is set on the product of the branching fractions of Ds+→a0(980)0e+νe and a0(980)0→π0η decays.