DOI 10.1007/s100529900192
Comparing the broken
linear sigma model
with experiment
N.A. Törnqvist
Physics Deptartment University of Helsinki, PB9, 00014 Helsinki, Finland
Received: 9 June 1999 / Published online: 14 October 1999
Abstract
The linear 
model with broken
is compared
with data
of the lightest scalar and pseudoscalar mesons.
When 5 of the 6 parameters are fixed by the
pseudoscalar masses and decay constants, one finds that,
already at the tree level, one has a reasonable description
for the 4 scalar masses, describing mixing
and up to 8 trilinear couplings of lightest scalars,
taken as
and
K*0(1430
). This clearly indicates that these scalars are the chiral partners
of the
,
and this strongly suggests
that they, like the latter, are (unitarized) 
states.
Copyright Springer-Verlag
