The a0(980) and f0(980) in the process Ds+→K+K−π+

Abstract

In this work, we have investigated the process Ds+→K+K−π+, taking into account the contributions from the S-wave pseudoscalar-pseudoscalar interaction within the chiral unitary approach, and also the intermediate ϕ resonance. By analyzing the BESIII and BABAR measurements, we conclude that the f0(980) state, dynamically generated from the S-wave pseudoscalar-pseudoscalar interaction, gives the dominant contribution close to the K+K− threshold in the K+K− invariant mass distribution of the decay Ds+→K+K−π+ in S-wave. On the other hand, our results imply that the lineshape adopted by BESIII and BABAR for the resonances a0(980) and f0(980) is not advisable in the fit to the data close to the K+K− threshold.