@Article{Molina_etal2020,
author="Molina, R.
and Xie, J. J.
and Liang, W. H.
and Geng, L. S.
and Oset, E.",
title="Theoretical interpretation of the D-s(+) -> pi(+)pi(0)eta decay and the nature of a(0)(980)",
journal="Physics Letters B",
year="2020",
publisher="Elsevier",
volume="803",
pages="135279--4pp",
abstract="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.",
optnote="WOS:000521730300066",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4356), last updated on Tue, 14 Apr 2020 09:36:06 +0000",
issn="0370-2693",
doi="10.1016/j.physletb.2020.135279",
opturl="https://arxiv.org/abs/1908.11557",
opturl="https://doi.org/10.1016/j.physletb.2020.135279",
language="English"
}