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Demanding the analyticity of hadronic observables (calculated in terms of power series of the running coupling) as a whole, we show that they are free of the Landau singularity. Employing resummation and dispersion-relation techniques, we compute in a unifying way power corrections to two different hard-scattering functions in perturbative QCD: the… (More)

The spin-field interaction is considered, in the context of the gauge fields/string correspondence, in the large 't Hooft coupling limit. The latter can be viewed as a WKB-type approximation to the AdS/CFT duality conjecture. Basic theoretical objects entering the present study are (a) the Wilson loop functional, on the gauge field side and (b) the sigma… (More)

We employ the Polyakov world-line path-integral version of QCD to identify and resum at leading perturbative order enhanced radiative gluon contributions to the Drell-Yan type (q ¯ q pair annihilation) cross-sections. We emphasize that this is the first time that world-line techniques are applied to cross-section calculations.

A theoretical scheme which relates multiparticle states generated in ultrarelativistic nuclear collisions to a QCD phase transition is considered in the framework of the uni-versality class provided by the 3-D Ising model. Two different evolution scenarios for the QGP system are examined. The statistical mechanics of the critical state is accounted for in… (More)

- A. I. Karanikas
- 1998

Worldline techniques are employed to study the general behaviour of the fermion-fermion collision amplitude at very high energies in a non-abelian gauge field theory for the forward and fixed angle scattering cases. A central objective of this work is to demonstrate the simplicity by which the worldline methodology isolates that sector of the full theory… (More)

- C. N. Gagatsos, A. I. Karanikas, G. I. Kordas
- Open Syst. Inform. Dynam.
- 2013

In the present work we are studying a bosonic quantum field system at finite temperature, and at zero and non-zero chemical potential. For a simple spatial partition we calculate the corresponding geometric entropy and we find that it contains terms originated from genuine quantum as well from classical thermal correlations. After the subtraction of the… (More)

- C. N. Gagatsos, A. I. Karanikas, G. I. Kordas
- Open Syst. Inform. Dynam.
- 2011

The Stochastic Vacuum Model for QCD, proposed by Dosch and Simonov, is fused with a Worldline casting of the underlying theory, i.e. QCD. Important, non pertur-bative features of the theory are studied. In particular, contributions associated with the spin-field interaction are calculated and both the validity of the loop equations and the Bianchi identity… (More)

The Stochastic Vacuum Model for QCD, proposed by Dosch and Simonov, is fused with a Worldline casting of the underlying theory, i.e. QCD. Important, non-perturbative features of the model are studied. In particular, contributions associated with the spin-field interaction are calculated and both the validity of the loop equations and of the Bianchi identity… (More)

Employing the Worldline casting of the Dosch-Simonov Stochastic Vacuum Model (SVM) for QCD, a simulated meson-meson scattering problem is studied in the Regge kinematical regime. The process is modelled in terms of the 'helicoidal' Wilson contour first introduced by Janic and Peschanski in a related study based on an AdS/CFT-type approach. Using lattice… (More)