The Open Nuclear & Particle Physics Journal

2010, 3 : 16-21
Published online 2010 December 13. DOI: 10.2174/1874415X01003010016
Publisher ID: TONPPJ-3-16

Jet Quenching: A Fresh Look at the Energy Loss Scenario

B.Z. Kopeliovich , I.K. Potashnikova and Ivan Schmidt
this author at the Departamento de Fsica, Universidad Técnica Federico Santa Mara, and Instituto de Estudios Avanzados en Ciencias e Ingeniera, and Centro Científico-Tecnológico de Valparaíso, Casilla 110-V, Valparaíso, Chile

ABSTRACT

The popular energy loss scenario explaining the observed suppression of hadrons produced via in-medium hadronization relies upon poorly justified assumptions. First, one assumes that hadronization and energy loss are continuing through the whole medium and ends far outside. Second, the standard prescription for incorporating energy loss induced by multiple interactions in the medium is to make a shift of the variable in the fragmentation function. This implies that the hadronization starts only at the medium surface. In this note we challenge the latter assumption. We calculate the upper bound for the modification of the fragmentation function via the medium driven DGLAP evolution. The effects are found to be too week to explain available data and quite different from what is predicted by the standard energy loss scenario.

Keywords:

Heavy ions, QCD, energy loss, suppression, perturbative.