https://doi.org/10.1140/epjc/s10052-009-0993-3
Regular Article - Theoretical Physics
Towards light scalar meson structure
1
Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia
2
Institute of Theoretical and Experimental Physics, 117259, Moscow, Russia
3
Soltan Institute for Nuclear Studies, 00-681, Warsaw, Poland
4
Bogolyubov Institute for Theoretical Physics, 03143, Kiev, Ukraine
* e-mail: molodtsov@itep.ru
Received:
23
June
2008
Revised:
9
February
2009
Published online:
26
March
2009
The origin of the lightest scalar mesons is studied in the framework of the instanton liquid model of the QCD vacuum. The impact of phonon-like vacuum excitations on the σ-meson features is qualitatively analyzed. In particular, it is noticed that the changes produced in the scalar sector may unexpectedly become quite considerable in spite of insignificant values of corrections to the dynamical quark masses and then the medley of σ-meson and those excitations may reveal itself as broad resonance states of different masses.
© Springer-Verlag , 2009
