Eur. Phys. J. C 10, 469-472
DOI 10.1007/s100529900126
Comment on "Understanding the scalar meson 
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
Abstract
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 
) 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.
Copyright Springer-Verlag
