Mainz 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 44: Schwerionenkollisionen und QCD Phasen
HK 44.1: Gruppenbericht
Donnerstag, 22. März 2012, 16:30–17:00, P 5
Jet Reconstruction in Pb-Pb Collisions at √sNN = 2.76 TeV with ALICE — •Bastian Bathen1, Christian Klein-Bösing1,2, and Markus Zimmermann1 — 1Institut für Kernphysik, WWU Münster — 2ExtreMe Matter Institute EMMI, GSI, Darmstadt
The Large Hadron Collider (LHC) at CERN delivered in 2010 and 2011 heavy-ion collisions (Pb-Pb) with collision energies per nucleon pair of √sNN = 2.76 TeV. The ALICE experiment studies those collisions to explore the quark-gluon plasma (QGP), a state of matter where the color confinement of the quarks and gluons, which constrains them in hadrons, does not exist anymore.
Initial, hard scattered partons, with large momentum transfer in transverse direction, can be used as probes to study properties of the QGP since they traverse the medium before they fragment into a spray of hadrons ("jets"). Thereby the partons strongly interact with the medium and exchange momentum. That results in a modified fragmentation pattern compared to jets in proton-proton collisions.
The aim of jet measurements is an unbiased reconstruction of the parton properties and jet structure. The main issue in central heavy-ion collisions is the large amount of soft background from subleading processes. We present the current status of jet reconstruction based on charged particles with the ALICE experiment and we discuss the impact of the underlying event for the jet reconstruction.
Supported by BMBF and HA216/EMMI.