Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Theorie

HK 40.9: Vortrag

Donnerstag, 13. März 2008, 18:45–19:00, 2F

Interacting Instanton Liquid Model and transition into the Chiral Regime of QCD — •Marco Cristoforetti¹, Pietro Faccioli², Marco Traini², and John W. Negele³ — ¹Physik Department, Technische Universität München, D-85747 Garching, Germany. — ²Trento University and I.N.F.N. Gruppo Collegato di Trento, Via Sommarive 14 Povo (Trento), 38100 Italy. — ³Center for Theoretical Physics Massachusetts Institute of Technology, NE25-4079, 77 Massachusetts Ave, Cambridge, MA 02139-4307, USA.

The non-perturbative quark-gluon interaction depends significantly on the value of the quark mass. In particular, in the light quark mass regime, correlations are strongly induenced by dynamics associated to chiral symmetry breaking.

We use the Interacting Instanton Liquid Model (IILM) as a tool to investigate the microscopic dynamical mechanisms which underly the dependence on the quark mass and drive the transition into the chiral regime of QCD. In particular we show that light hadrons exist in the instanton vacuum and, for stable states, the dependence on the quark mass in the IILM agrees well with the predictions of chiral perturbation theory and with lattice simulations.