Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Schwerionenkollisionen und QCD Phasen

HK 4.1: Gruppenbericht

Montag, 17. März 2014, 14:00–14:30, HZ 6

Jet reconstruction and measurement of identified fragmentation functions in Pb-Pb and pp collisions with the ALICE experiment — •Xianguo Lu and Oliver Busch for the ALICE collaboration — Physikalisches Institut, Heidelberg, Germany

Jets are defined in QCD as cascades of consecutive emission of partons from an initial hard scattering. The process of parton showering and subsequent hadronisation is broadly known as fragmentation. High energy nucleus-nucleus collisions allow us to probe parton fragmentation within a QCD medium and the properties of this medium via the modification of the jet spectrum and jet structure. Jet reconstruction in pp collisions provides an elementary baseline and allows to investigate perturbative and non-perturbative aspects of particle production. In addition to inclusive probes, identified particles in the final states provide an enhanced sensitivity to the flavor dependence of fragmentation and nuclear modifications.

ALICE at the CERN LHC is a general-purpose heavy ion experiment designed to study the physics of strongly interacting matter and the Quark-Gluon-Plasma. It has an excellent tracking and particle identification performance over a wide momentum range. In this talk we present results on inclusive jet observable as well as the novel measurements of identified fragmentation functions in pp and Pb-Pb collisions. The results are confronted with theory predictions.