ep - p h / 97 02 24 5 v 1 4 F eb 1 99 7 The Static Potential in QCD – a full Two - Loop Calculation ∗

ar X iv : h ep - p h / 97 02 24 5 v 2 1 7 O ct 1 99 7 The Static Potential in QCD – a full Two - Loop Calculation ∗

A full analytic calculation of the two-loop diagrams contributing to the static potential in QCD is presented in detail. Using a renormalization group improvement, the “three-loop” potential in momentum space is thus derived and the third coefficient of the β-function for the V -scheme is given. The Fourier transformation to position space is then performed, and the result is briefly discussed.

ep - p h / 98 02 27 4 v 1 9 F eb 1 99 8 QCD Field Strength Correlator at the One - Loop Order

The leading perturbative contributions into the two-point gauge-invariant correlator T rgF µν (x)U(x, 0)U(0, y)gF ρσ (y)U(y, 0)U(0, x) are calculated at the one-loop order. It is shown, that nonlocal condensate T rα s F µν F µν is nonzero at this order. The relation with the renormalization properties of Wilson loops is briefly discussed.

ar X iv : h ep - t h / 99 02 02 7 v 1 3 F eb 1 99 9 INFRARED REGION OF QCD AND CONFINEMENT

Gauge field configurations appropriate for the infrared region of QCD is proposed. Using the usual QCD action, confinement is realized as in the London theory of Meissner effect.

ar X iv : h ep - p h / 96 02 20 5 v 1 1 F eb 1 99 6 Multiplicity Distributions in QCD and λφ 36 - model

ar X iv : h ep - p h / 99 02 24 8 v 1 5 F eb 1 99 9 The gluon field of a fast moving nucleus and the effective langrangian for QCD at high energy

Starting from the effective lagrangian for QCD at high energy we calculate the lowest perturbative contributions to the classical potential of a relativistic nucleus and compare our results to those derived by Kovchegov in Ref.[3]. We find that our results differ from the classical potential already at order g. Therefore the usage of the effective lagrangian for high energy QCD should allow for...