Dynamical chiral symmetry breaking and confinement: Its interrelation and effects on the hadron spectrum

by Mario Schroeck (INFN, Roma Tre)

Thursday 20 Feb 2014, 14:30 → 15:30 Europe/Rome

C (Roma Tre)

We investigate the interrelation between the two main characteristic phenomena of QCD, dynamical chiral symmetry breaking and confinement. To this end, we apply lattice QCD and adopt a method to artificially restore the dynamically broken chiral symmetry. According to the Banks-Casher relation, it is the low-mode part of the Dirac eigenspectrum which is tied to the dynamical breaking of the chiral symmetry. Utilizing two-flavor dynamical lattice gauge field configurations, we construct valence quark propagators that exclude a variable sized part of the low-mode Dirac spectrum, with the aim of using these as an input for meson and baryon interpolating fields. Subsequently, we explore the behavior of ground and excited states of the low-mode truncated hadrons using the variational analysis method. We look for the existence of confined hadron states, extract effective masses where applicable and study the arising symmetries in the hadron spectrum.