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- A. S. Kapoyannis, A. I. Karanikas, C. N. Ktorides
- Computer Physics Communications
- 2006

A numerical program is presented which facilitates a computation pertaining to the full set of one-gluon loop diagrams (including ghost loop contributions), with M attached external gluon lines in all possible ways. The feasibility of such a task rests on a suitably defined master formula, which is expressed in terms of a set of Grassmann and a set of… (More)

A theoretical scheme which relates multiparticle states generated in ultrarelativistic nuclear collisions to a QCD phase transition is considered in the framework of the universality 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. S. Kapoyannis, C. N. Ktorides, A. D. Panagiotou, Paraskevi Attikis
- 1997

We extend the Statistical Bootstrap Model (SBM) in order to describe hadronic systems which carry strangeness. We establish that the hadronic phase can exist only in a region of the phase space ( ) T q s , , μ μ , which is bounded by a “critical” surface. The SBM leads to a mass spectrum with the asymptotic form : ( ) [ ] ρ α m m T T = − exp * , where the… (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 (qq̄ pair annihilation) cross-sections. We emphasize that this is the first time that world-line techniques are applied to cross-section calculations.… (More)

We consider a four-point process, associated with a wide-angle elastic scattering of two off-mass-shell spin-1/2 matter particles, in a non-abelian gauge theory. On the basis of a worldline approach, which reverts the functional to a path-integral description of the system, we factorize an eikonal (“soft”) subsector of the full theory and calculate 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)

- C. N. Ktorides
- 2008

The validity of the Bianchi identity, which is intimately connected with the zig zag symmetry, is established, for piecewise continuous contours, in the context of Polakov’s gauge field-string connection in the large ’tHooft coupling limit, according to which the chromoelectric ‘string’ propagates in five dimensions with its ends attached on a Wilson loop… (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 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)

- G. C. Gellas, T. R. Hemmert, C. N. Ktorides, G. I. Poulis
- 1998

The three complex form factors entering the ∆ → Nγ∗ vertex are calculated to O(ε3) in the framework of a chiral effective theory with explicit ∆(1232) degrees of freedom included. It is shown that the low q2 behavior of the form factors is governed by πN , π∆ loop effects. Predictions are given for the q2-dependence of the three transition-multipoles… (More)

We consider a four-point process, associated with a wide-angle elastic scattering of two off-mass-shell spin-1/2 matter particles, in a non-abelian gauge theory. On the basis of a worldline approach, which reverts the functional to a path-integral description of the system, we factorize an eikonal (“soft”) subsector of the full theory and calculate the… (More)