We analyze the spectral properties of the quark propagator above the critical temperature for the deconfinement phase transition in quenched lattice QCD using clover improved Wilson fermions. The bare quark mass dependence of the quark spectral function is analyzed by varying the hopping parameter κ in Landau gauge. We assume a two-pole structure for the quark spectral function, which is numeri...

Recent observational data suggests a high compacticity (the quotient M/R) of some ”neutron” stars. Motivated by these works we revisit models based on quark-diquark degrees of freedom and address the question of whether that matter is stable against diquark disassembling and hadronization within the different models. We find that equations of state modeled as effective λφ theories do not genera...

In this work the dressed quark propagators and approximation schemes are guided by the Dyson-Schwinger equation (DSE) approach to non-perturbative QCD modeling of hadron physics. This covariant QCD phenomenology has proved to be quite efficient for low-mass mesons and their form factors. To expedite investigations we make use of a convenient parameterization of confining solutions of quark DSEs...

Based on the hierarchy exhibited by quarks masses at low energies, we assume that Yukawa couplings of up and down quarks are related by Yu ∝ Y 2 d at grand unification scales. This ansatz gives rise to a symmetrical CKM matrix at the grand unification (GU) scale. Using three specific models as illustrative examples for the evolution down to low energies, we obtain the entries and asymmetries of...

We apply spectral methods to compute the OZI-rule suppressed loop-loop correlators in the pseudocalar meson flavour singlet channel. Using SESAM configurations (obtained with two degenerate sea quark flavours on 16×32 lattices at β = 5.6, with standard Wilson action), we find for the first time clear evidence for mass plateau formation in the ηchannel of this theory. As a consequence, we observ...

The relativistic string with massive ends (the meson model) and four various string baryon models: q-qq, q-q-q, Y and ∆ are considered. In particular, the rotational motions for all these systems are applied to describing the leading Regge trajectories, and also the classical dynamics beyond the usual rectilinear string rotations is studied. For the string meson model the two types of quasirota...

Abstract: We present the exact next-to-leading order (NLO) QCD corrections to dijet production at the LHC via quark contact interactions, with different color and chiral structures induced from new physics. Following the recent analysis of quark compositeness search at the LHC, we find that the NLO QCD corrections can lower the dijet cross sections by several tens percent, depending on the theo...