Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-09-04
Eur.Phys.J.C49:333-338,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages for Hot Quarks '06 Conference
Scientific paper
10.1140/epjc/s10052-006-0069-6
Hadron production at high-$p_T$ displays a strong suppression pattern in a wide rapidity region in heavy ion collisions at RHIC energies. This finding indicates the presence of strong final state effects for both transversally and longitudinally traveling partons, namely induced energy loss. We have developed a perturbative QCD based model to describe hadron production in $pp$ collision, which can be combined with the Glauber -- Gribov model to describe hadron production in heavy ion collisions. Investigating $AuAu$ and $CuCu$ collisions at energy $\sqrt{s}=200$ $A$GeV at mid-rapidity, we find the opacity of the strongly interacting hot matter to be proportional to the participant nucleon number. Considering forward rapidities, the suppression pattern indicates the formation of a longitudinally contracted dense deconfined zone in central heavy ion collisions. We determine parameters for the initial geometry from the existing data.
Barnafoldi Gergely Gábor
Fai George
Levai Péter
Papp György
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