Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 16: Schwerionenkollisionen und QCD Phasen
HK 16.6: Vortrag
Montag, 4. März 2013, 18:15–18:30, HSZ-201
Correction of detector effects with the HBOM method in event background fluctuations — •Markus Zimmermann1,2 and Christian Klein-Bösing1 — 1Institut für Kernphysik, WWU Münster — 2CERN
An important aspect of the ALICE analysis of the Quark-Gluon Plasma with hard probes are jets, which are an accumulation of particles. In heavy ion collisions, a reconstructed jet always contains particles from the background which are not generated by the initially scattered particles. The energy of this particles has to be subtracted to get the real jet energy. These background energy is different for each event and furthermore fluctuates from region to region inside each event.
Besides this, detector effects complicate the energy estimation of the jets. The used detectors only have a restricted efficiency to detect a particle and this leads to a significant amount of missing charged particles in the events. To get the real value of a measured observable it has to be corrected for these detector effects.
The background fluctuations can be corrected for the efficiency part of their detector effects with a new method, the HBOM method. In this method the detector effects are applied a few times more on the data. Than the observables are back-extrapolated to a detector effect of zero. This method does not need the knowledge about correlations in the event. Only the measured data and the detector effects which should be corrected have to be known.