Exploitable results
The properties of a dense strongly interacting matter can be described by Quantum Chromodynamics (QCD), the fundamental theory of strong interaction. Experimentally the properties of strongly interacting matter can be studied in ultrarelativistic heavy-ion collision. In this project both fundamental properties of the strongly interacting matter and problems in extracting the information from heavy-ion collisions have been studied using and developing both theoretical and numerical methods.
The phase structure of full QCD with respect to triality has been studied in the lattice formulation using the canonical ensemble. Also the effective potential for three-dimensional SU(2) gauge theory at finite temperatures has been calculated in the strong coupling regime. The potential exhibits a deconfinement phase transition unlike the similar potential obtained using grand canonical ensemble which demonstrates an explicit Z(N)-symmetry breaking at any temperature. Furthermore, we investigated the effective potential with the chiral condensate included and found out that chiral symmetry is restored in all triality sectors.
A recent sum rule calculation for inelastic quarkonium-hadron interactions has been extended to realistic parton distribution functions. The cross section for J/ photo-production on nucleons was calculated using the sum rules obtained from the operator product expansion. Our result relates the energy dependence of the cross section to the x dependence of the gluon distribution function G(x) of the nucleon.
The study of the properties of QGP in nuclear collisions is complicated by finite size effects which will affect, e.g. the thermal emission of lepton pairs. We have studied the mass dependence of the spectra in the meson mass region and below it and found considerable smoothing of the resonance peak with enhanced production below the peak. Lepton pair emission for the CERN-SPS nuclear collisions were calculated but we have not yet had the time to implement these results fully to the hydrodynamic calculations.
An applicability of the dipole configurations to describe the structure functions of nuclei has been discussed and was shown that a radiation generated by dipole configurations while moving relativistically along their axes is described by distribution functions which are finite and infrared stable in low transverse momentum region.
A description of colliding nuclei as droplets of effective Fermi-liquid with the particles carrying the colour and spin degrees of freedom has been considered. The coloured Fermi-liquid is able to develop oscillations of various types and their spectra can be studied using the collisionless transport equitation for quarks. In the collision of two Fermi-liquid drops instabilities can arise in the quark matter after its formation. It is argued that generation of measurable quark jets can be expected in the direction of propagation of these increasing oscillations.
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