出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present first results for a study with two mass-degenerate dynamical Chirally Improved (CI)
fermions on lattices of spatial extent 2.4 fm. The CI Dirac operator obeys the Ginsparg-Wilson
condition in good approximation. The pion mass we use is still large O(470MeV) for the 163×32
lattices with lattice spacing of 0.15 fm. The hadron masses are obtained with the variational technique
and the results compared with earlier quenched calculations with similar lattice parameters.
We find indications for the isovector, scalar meson a0(980) near the experimental value, in contradistinction
to quenched results which always produced a mass value compatible with the first
excitation a0(1450).
