Flatte-like distributions and the a₀(980)/f₀(980) mesons

V. Baru , J. Haidenbauer , C. Hanhart , A. Kudryavtsev , Ulf-G. Meissner

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classification ⚛️ nucl-th hep-ph

keywords constantscouplingflatte-likekkbarmesonsabsoluteamplitudeargue

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We explore the features of Flatte-like parametrizations. In particular, we demonstrate that the large variation in the absolute values of the coupling constants to the pi-eta (or pi-pi) and KKbar channels for the a_0(980) and f_0(980) mesons that one can find in the literature can be explained by a specific scaling behaviour of the Flatte amplitude for energies near the KKbar threshold. We argue that the ratio of the coupling constants can be much better determined from a fit to experimental data.

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Does $\psi(4660)$ exist?
hep-ph 2026-05 unverdicted novelty 4.0

Fits using coupled channels and bare states show the psi(4660) as a conventional charmonium state above the Lambda_c pair threshold in both Belle and BESIII datasets.