Speaker
Markus Kohler
(GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
Description
Electromagnetic probes are excellent messengers from the hot and dense medium
created in ultra-relativistic heavy-ion collisions. Since leptons do not interact
strongly, their spectra reflect the entire space-time evolution of a
collision. The surrounding medium can lead to modifications of the dielectron
production rate. To quantify modifications in heavy-ion collisions, measurements
in pp collisions serve as a reference, while the analysis of p-A collisions
allows to disentangle cold from hot nuclear matter effects.
We present dielectron measurements with the ALICE central barrel detectors. The
invariant mass distributions in the range $ 0 < m_{ee} < 3 $ GeV/$ c^{2} $ are
compared to the expected hadronic sources for pp collisions at $ \sqrt{s}=7 $
TeV, and for p-Pb collisions at $ \sqrt{s_{\rm NN}} = 5.02$ TeV. The cross
section of virtual direct photons measured in pp collisions is compared to
predictions from NLO calculations as a function of the transverse momentum.
Latest results of the analysis of Pb-Pb collisions at $ \sqrt{s_{\rm NN}}=2.76 $
TeV are presented.
| On behalf of collaboration: | ALICE |
|---|
Primary author
Markus Kohler
(GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
