RT Journal Article
T1 Theoretical interpretation of the Ds+→π+π0η decay and the nature of a0(980)
A1 Molina, Raquel
A1 Xie, Ju Jun
A1 Liang, Wei Hong
A1 Geng, Li Sheng
A1 Oset, Eulogio
AB In a recent paper [1], the BESIII Collaboration reported the so-called first observation of pure W -annihilation decays D+ s → a+ 0 (980)π0 and D+ s → a0 0(980)π+. 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 180 degrees. In this letter, we show that all these can be easily understood if the a0(980) is a dynamically generated state from K K¯ and πη 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 a0(980) also provide a natural explanation to the measured negative interference between the two decay modes.
PB Elsevier Science BV
SN 0370-2693
YR 2020
FD 2020-02-07
LK https://hdl.handle.net/20.500.14352/7256
UL https://hdl.handle.net/20.500.14352/7256
LA eng
NO Ministerio de Economía y Competitividad (MINECO)/FEDER
NO Centro de Excelencia Severo Ochoa
NO Comunidad de Madrid
NO National Natural Science Foundation of China
NO Youth Innovation Promotion Association CAS
DS Docta Complutense
RD 8 abr 2025