We study theoretically the resonant structure of the double Cabibbo suppressed D+→K−K+K+ decay. We start from an elementary production diagram, considered subleading in previous approaches, which cannot produce a final K−K+ pair at the tree level but which we show to be able to provide the strength of the decay through final meson-meson state interaction. The different meson-meson elementary productions are related through SU(3) and the final rescattering is implemented from a suitable implementation of unitary extensions of ChPT which generate dynamically the scalar resonances f0(980) and a0(980). We obtain a good agreement with recent experimental data from the LHCb collaboration with a minimal freedom in the fit and show the dominance of the a0(980) contribution close to the threshold of the K−K+ spectrum.
@article{arxiv.2011.05185,
title = {Scalar resonances in the $D^+\to K^-K^+K^+$ decay},
author = {L. Roca and E. Oset},
journal= {arXiv preprint arXiv:2011.05185},
year = {2021}
}