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Description
1.Peter Minkowski (Univ. Bern)
On the thermal phases of QCD: quark gluon plasma - condensed hadrons
The base condensates within QCD with u,d and s flavors modify the thermodynamic properties of the condensed phase through a positive vacuum pressure. The vanishing of this pressure generates the plasma phase with two extreme boundaries:
a) zero chemical potentials and
b) zero temperature.
Theoretical expectations for signatures of the phase transition are discussed together with the limitations of a thermal description of multiparticle production through central collisions of heavy ions, hadrons and e+e- annihilation.
2. Sonja Kabana (Univ. Bern)
Initial energy density: a unique indicator of the QCD phase transition?
We address the following questions:
1) Is there evidence for the QCD phase transition in global observables showing a discontinuity, beyond rare probes as the J/Psi or Omega data?
2) Can we extract from the data the critical initial energy density above which the QCD phase transition occurs?
3) Is the initial energy density the only discriminating parameter for this transition ?
The answers to those questions are tentatively: yes.
We discuss to which extent universal features of the QCD phase transition in particle and nuclei collisions appear. These assertions will be challenged by new RHIC and SPS measurements.
3. Joerg Raufeisen (Los Alamos National Laboratory)
Color dipole approach to the Drell-Yan process in pA collisions
In the target rest frame and at high energies, Drell-Yan (DY) dilepton production looks like bremsstrahlung of massive photons, rather than parton annihilation. The projectile quark is decomposed into a series of Fock states. Configurations with fixed transverse separations are interaction eigenstates for pp scattering. The DY cross section can then be expressed in terms of the same color dipole cross section as DIS. This approach is especially suitable to describe nuclear effects, since it allows to apply Glauber multiple scattering theory. We go beyond the Glauber eikonal approximation by taking into account transitions between states, which would be eigenstates for a proton target. We calculate nuclear shadowing at large Feynman-$x_F$ for DY in proton-nucleus collisions, compare to existing data from E772 and make predictions for RHIC. Nuclear effects on the transverse momentum distribution are also investigated.
Organiser(s): Yiota Foka, Guy Paic and Urs Wiedemann
Organiser(s): Yiota Foka, Guy Paic and Urs Wiedemann