2020 Impact factor 4.590
Particles and Fields

Eur. Phys. J. C 10, 469-472
DOI 10.1007/s100529900126

Comment on "Understanding the scalar meson $q\bar{q}$nonet''

E. van Beveren1 - G. Rupp2

1 Departamento de Física, Universidade de Coimbra, P-3000 Coimbra, Portugal (e-mail: eef@malaposta.fis.uc.pt)
2 Centro de Física das Interacções Fundamentais, Instituto Superior Técnico, Edifício Ciência, P-1096 Lisboa Codex, Portugal (e-mail: george@ajax.ist.utl.pt)

Received: 17 February 1999 / Published online: 15 July 1999

It is shown that the incomplete scalar meson nonets found by Törnqvist [1] and Törnqvist & Roos [2], employing a new version of the Helsinki unitarised quark model, should in fact be complete, including an as yet unconfirmed light K0* below 1 GeV (old $\kappa$) and the established f0(1500). A detailed comparison is presented with the predictions of the Nijmegen unitarised meson model, in which two complete scalar nonets show up below 1.5 GeV [3]. The reason for the flavour-nonet breaking found in [1,2] we argue to originate in the use of coupling constants for the three-meson vertex which are not independent of flavour. Also some statements made in [1] are critically reviewed.

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