Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Heavy Ion Collisions and QCD Phases 2
HK 15.7: Vortrag
Montag, 23. März 2015, 18:45–19:00, T/HS1
Measurement of charged jet fragmentation in p-Pb collisions at √sNN = 5.02 TeV with ALICE — •Dennis Weiser for the ALICE collaboration — Physikalisches Institut, Heidelberg, Deutschland
A Large Ion Collider Experiment (ALICE) is a dedicated heavy-ion experiment at the LHC that is focused on the study of the hot and dense strongly interacting medium created in Pb-Pb collisions, the so-called Quark-Gluon-Plasma (QGP). Prior to the QGP formation hard partons can be created in initial hard scattering processes and form jets by fragmentation into hadrons. Jets can probe the QGP and access its properties via energy loss or, for instance, the modification of jet structure observables.
The measurement of jet structure observables in p-Pb collisions provides an important reference to the measurement in Pb-Pb collisions. To assign possible modifications in Pb-Pb collisions to in-medium effects a measurement in a reference system is needed in that the medium is not created, but where possible initial-state- or cold-nuclear-matter effects are present.
We present the measurement of the longitudinal momentum distribution of tracks in charged jets in p-Pb collisions at √sNN = 5.02 TeV using minimum bias and Transition Radiation Detector (TRD) triggered data. By demanding 3 tracks above 3 GeV/c in any TRD stack an efficient trigger on high pT jets is realised. Thus the TRD triggered data can be used to extend the range of the measurement towards high pT.