Christian S. Fischer

Phase structure of three and four flavor QCD

We investigate the phase structure of QCD at finite temperature and light-quark chemical potential. We improve upon earlier results for N_f=2+1 dynamical quark flavors and investigate the effects of charm quarks in an extension to N_f=2+1+1. We determine the quark condensate and the Polyakov loop potential using solutions of a coupled set of (truncated) Dyson-Schwinger equations for the quark and gluon propagators of Landau gauge QCD. At zero chemical potential we find excellent agreement with results from lattice-QCD. With input fixed from physical observables we find only a very small influence of the charm quark on the resulting phase diagram at finite chemical potential. We discuss the location of the emerging critical end-point and compare with expectations from lattice gauge theory.

Spectra of heavy mesons in the Bethe-Salpeter approach

Abstract.We present a calculation of the spectrum of charmonia, bottomonia and Bc-meson states with “ordinary” and exotic quantum numbers. We discuss the merits and limitations of a rainbow-ladder truncation of Dyson-Schwinger and Bethe-Salpeter equations and explore the effects of different shapes of the effective running coupling on ground and excited states in channels with quantum numbers

Mass spectra and Regge trajectories of light mesons in the Bethe-Salpeter approach

Jle 3

Pion cloud effects on baryon masses

. We furthermore discuss the status of the

Dynamical quark mass generation in a strong external magnetic field

X(3872)

Beyond rainbow-ladder in bound state equations

as a potential (excited) quark-antiquark state and give predictions for the masses of charmonia and bottomonia in the tensor channels with

Octet and Decuplet masses: a covariant three-body Faddeev calculation

J= 2, 3

The muon g-2: Dyson-Schwinger status on hadronic light-by-light scattering

.

Phase structure of QCD for heavy quarks

Abstract.We extend the calculation of relativistic bound states of a fermion anti-fermion pair in the Bethe-Salpeter formalism to the case of total angular momentum

Locating the critical end point of QCD

J=3