Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Heavy Ion Collisions and QCD Phases 3
HK 24.3: Vortrag
Dienstag, 24. März 2015, 15:30–15:45, T/HS1
Separation of the Charm- and Beauty Production in pp- and Pb–Pb Collisions Using ALICE — •Martin Völkl for the ALICE collaboration — Universität Heidelberg
In heavy ion collisions the energy loss of heavy quarks is an interesting quantity for the investigation of the properties of the Quark-Gluon Plasma (QGP). Heavy quarks are produced almost exclusively in the initial hard interactions. Thus, they can interact with the surrounding matter throughout its evolution. The heavy quarks form hadrons which may have electrons as decay products. An approach for the measurement of the energy loss of heavy quarks in the QGP is the comparison of the spectra of such electrons from heavy-ion collisions with those from proton-proton collisions. The implications for the understanding of the QGP can then be analyzed via comparison with theoretical predictions and models. For this, the difference in the result for beauty- and charm quarks is of particular interest due to expected differences in their energy loss. In the analysis presented here, these contributions are separated statistically using their different impact parameter distributions. The impact parameter for electrons from hardons containing a beauty quark is typically larger due to the larger decay length (cτ≈500µ m) of the hadrons. The excellent particle identification properties of ALICE allow for a very clean selection of electrons. Here, the current results of the analysis are presented for pp at √s=7TeV and Pb–Pb at √sNN=2.76TeV.