If high energy heavy ion collisions lead to the formation of a hot quark-gluon plasma, then colour screening prevents ce binding in the deconfined interior of the interaction region. To study this effect, the temperature dependence of the screening radius, as obtained from lattice QCD, is compared with the J/~' radius calculated in charmonium models. The feasibility to detect this effect clearl...

To understand the short versus long-distance final-state interactions, we have performed a detailed amplitude analysis for the two-body decay J/ψ → 10. The current data favor a large relative phase nearly 90 between the three-gluon and the one-photon decay amplitudes. The source of the phase is apparently the long-distance final-state interaction. Nothing anomalous is found in the magnitudes of...

Final-state interaction and screening have a great influence on qq̄ production cross sections, which are important quantities in many problems in quark-gluon plasma physics. They lead to an enhancement of the cross section for a qq̄ color-singlet state and a suppression for a color-octet state. The effects are large near the production threshold. The presence of screening gives rise to resonances...

An analysis of the temperature dependence of the leading contributions to the gluon condensate for SU(Nc) lattice gauge theory is presented using the data from recent Monte Carlo simulations. The gluon condensate is calculated directly from the new lattice calculations of the interaction measure. It is shown how these computations provide a simple picture for the melting of the condensate aroun...

Our aim is to show how the reggeization of the gluon, encoded in the bootstrap property of the BFKL kernel, permits to calculate the interaction kernel in the octet colour channel in the forward and non forward direction, for the quark contribution, starting from the known gluon trajectory up to 2nd order. To this end an ansatz to solve the bootstrap equation is used. The obtained result, for w...

We restrict our computation in the mean field approximation which could lead to a clear critical behavior. analyze scaling behavior with different shape of interaction kernel by considering dressed-gluon models. The exponent we obtained is consistent that $3D$ $\textrm{O}(4)$ universality class. size region up $m_{0}^{} \le 2\sim 4\;$MeV this sets naturally an upper bound since fluctuations bey...

We study photon-induced coherent production of Υ in ultraperipheral heavy ion collisions at LHC and demonstrate that the counting rates will be sufficient to measure nuclear shadowing of generalized gluon distributions. This will establish the transition from the regime of color transparency to the regime of perturbative color opacity in an unambiguous way. We argue that such measurements will ...

We show that the QCD van der Waals interaction due to multiple gluon exchange provides a new kind of attractive nuclear force capable of binding heavy quarkonia to nuclei. The parameters of the potential are estimated by identifying multi-gluon exchange with the pomeron contributions to elastic meson-nucleon scattering. The gluonic potential is then used to study the properties of CC nuclearbou...

Starting from the multi-Regge effective action for high-energy scattering in QCD a t-channel approach can be developed which is similar to the approach by White based on general Regge arguments. The BFKL kernel of reggeized gluon interaction, contributions to the 2 → 4 reggeized gluon vertex function and the one-loop correction to the BFKL kernel are considered. The conditions are discussed und...

We implement our past investigations in the quark-antiquark interaction through a non-perturbative running coupling defined in terms of a gluon mass function, similar to that used in some Schwinger-Dyson approaches. This coupling leads to a quarkantiquark potential, which satisfies not only asymptotic freedom but also describes linear confinement correctly. From this potential, we calculate the...