Speaker
Mr
Denis Parganlija
(TU Vienna, ITP)
Description
Scalar mesons have been one of the most hotly debated issues of
low-energy QCD for decades. Experimental data show the existence of six scalar isosinglet states in the region below 1 GeV -- next to the famous sigma meson, there are five states with the same quantum numbers but higher energies than the energy of the sigma. If we consider u and d quarks as degenerate and work in a theoretical framework that also includes strange states, then we can construct two isoscalar \bar q - q states. Thus constructed isoscalars can, of course, describe at most two out of the mentioned six experimentally known states - but the question is: Which two?
We present an Nf=3 linear sigma model with (pseudo)scalar and (axial-)vector mesons that allows us to pursue an answer to this question. We find the isoscalar states above 1 GeV -- f0(1370) and f0(1710) -- to be strongly favoured as quarkonia rather than f0(600) and f0(980).
Author
Mr
Denis Parganlija
(TU Vienna, ITP)
Co-authors
Prof.
Dirk H. Rischke
(Frankfurt University, ITP)
Dr
Francesco Giacosa
(Frankfurt University, ITP)
Dr
Gyorgy Wolf
(Research Institute for Particle and Nuclear Physics, Budapest)
Dr
Peter Kovacs
(Research Institute for Particle and Nuclear Physics, Budapest)
