Comparing the broken
linear sigma model
Physics Deptartment University of Helsinki, PB9, 00014 Helsinki, Finland
Received: 9 June 1999 / Published online: 14 October 1999
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.