Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Schwerionenkollisionen und QCD Phasen

HK 44.2: Talk

Thursday, March 22, 2012, 17:00–17:15, P 5

A study of jet fragmentation properties in proton-proton collisions at √s = 7 TeV with ALICE at the LHC — •Hermes Leon Vargas and Christoph Blume — Institut für Kernphysik, Goethe-Universität Frankfurt am Main

The excellent tracking capabilities of the ALICE experiment provide an ideal tool to study the properties of charged jets. These are characterized in this study via two observables: NT90 and the second moment of the jet profile. NT90 is defined as the minimum number of tracks inside the jet cone that are necessary to recover 90% of the jet transverse momentum. The second moment of the jet profile quantifies the spatial distribution of the tracks around the jet axis, weighted by their transverse momentum. The jet properties are presented as a function of the jet transverse momentum and as a function of the underlying charged particle multiplicity. The latter is measured by the detectors in the central barrel of the experiment, selecting a subset of the total event multiplicity. This subset is chosen such that any bias due to the hard scattering that initiated the jets is minimized. The selection is based on track transverse momentum cuts and event geometry. A comparison with Monte Carlo generators is presented.