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Comment on "Understanding the scalar meson q anti-q nonet"
Authors: E. van Beveren and G. Rupp
Ref.: The European Physical Journal C - Particles and Fields 10, 469-472 (1999)
Abstract: It is shown that the incomplete scalar meson nonets found by Törnqvist and Törnqvist and Roos, employing a new version of the Helsinki unitarised quark model, should in fact be complete, including an as yet unconfirmed light below 1 GeV (old ) and the established (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. The reason for the flavour-nonet breaking found in Törnqvist and Törnqvist and Roos 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 Törnqvist are critically reviewed
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