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HK: Fachverband Physik der Hadronen und Kerne
HK 16: Schwerionenkollisionen und QCD Phasen
HK 16.1: Gruppenbericht
Montag, 4. März 2013, 16:45–17:15, HSZ-201
Jet Reconstruction in Pb-Pb and pp collisions with the ALICE experiment — •Oliver Busch — Universität Heidelberg, Physikalisches Institut
Jets are defined in QCD as cascades of consecutive emission of partons from an initial hard scattering. The process of parton showering and subsequent hadronization 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.
The Large Hadron Collider (LHC) at CERN delivered in 2010 and 2011 heavy-ion collisions (Pb-Pb) with collision energy per nucleon pair of √sNN = 2.76 TeV and pp collisions at √s = 7 TeV. ALICE at the LHC is a general-purpose heavy ion experiment designed to study the physics of strongly interacting matter and the Quark-Gluon-Plasma, combining excellent charged particle reconstuction over a wide momentum range with electromagnetic calorimetry. We present measurements of jet production cross sections, jet structure and jet fragmentation for charged particle jets and full jets in Pb-Pb and pp collisions. The results are confronted with theory predictions.