C. N. Ktorides

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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)
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 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)
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)