Role of scalar mesons a0 (980) and a0 (1710) in the Ds+ →π0K+ KS0 decay

Recently, the BESIII Collaboration has measured the Ds+→π0K+KS0 decay and reported the observation of scalar meson a0(1710)+ in the K+KS0 invariant mass spectrum. Based on the previous study about such a state in the Ds+→π+KS0KS0 decay, we perform a theoretical study of a0(1710)+ in the process Ds+→π0a0(1710)+→π0K+KS0. In addition to the a0(1710) state, the contributions of K∗ and a0(980) are also taken into account. Firstly, we consider the contributions from the tree diagrams of K∗+→K+π0 and K̄∗0→π0K̄0. Secondly, we describe the final state interaction of KK̄ in the chiral unitary approach to study the contribution of a0(980), while the a0(1710) state is dynamically generated from the K∗K̄∗ interaction, and then decays into K+K̄0. Since the final K+KS0 state is in pure isospin I=1, the Ds+→π0K+KS0 decay is an ideal process to study the a0(1710)+ and a0(980)+ resonances. It is found that the recent BESIII experimental measurements on the K+KS0, π0K+, and π0KS0 invariant mass distributions can be well reproduced, which supports the molecular K∗K̄∗ nature of the scalar a0(1710) resonance.