%0 Journal Article
%T Theoretical interpretation of the D-s(+) -> pi(+)pi(0)eta decay and the nature of a(0)(980)
%A Molina, R.
%A Xie, J. J.
%A Liang, W. H.
%A Geng, L. S.
%A Oset, E.
%J Physics Letters B
%D 2020
%V 803
%I Elsevier
%@ 0370-2693
%G English
%F Molina_etal2020
%O WOS:000521730300066
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4356), last updated on Tue, 14 Apr 2020 09:36:06 +0000
%X In a recent paper [I], the BESIII Collaboration reported the so-called first observation of pure W-annihi- lation decays D-s(+) -> a(0)(+) (980)pi(0) and D-s(+) -> a(0)(0)(980)pi(+). The measured absolute branching fractions are, however, puzzlingly larger than those of other measured pure W-annihilation decays by at least one order of magnitude. In addition, the relative phase between the two decay modes is found to be about 0 degrees. In this letter, we show that all these can be easily understood if the a(0)(980) is a dynamically generated state from (K) over barK and pi eta interactions in coupled channels. In such a scenario, the D-s(+) decay proceeds via internal W emission instead of W-annihilation, which has a larger decay rate than W-annihilation. The proposed decay mechanism and the molecular nature of the a(0)(980) also provide a natural explanation to the measured negative interference between the two decay modes.
%R 10.1016/j.physletb.2020.135279
%U https://arxiv.org/abs/1908.11557
%U https://doi.org/10.1016/j.physletb.2020.135279
%P 135279-4pp