TY  - JOUR
AU  - Molina, R.
AU  - Xie, J. J.
AU  - Liang, W. H.
AU  - Geng, L. S.
AU  - Oset, E.
PY  - 2020
DA  - 2020//
TI  - Theoretical interpretation of the D-s(+) -> pi(+)pi(0)eta decay and the nature of a(0)(980)
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 135279
EP  - 4pp
VL  - 803
PB  - Elsevier
AB  - 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.
SN  - 0370-2693
UR  - https://arxiv.org/abs/1908.11557
UR  - https://doi.org/10.1016/j.physletb.2020.135279
DO  - 10.1016/j.physletb.2020.135279
LA  - English
N1  - WOS:000521730300066
ID  - Molina_etal2020
ER  -