Speaker
Mrs
Anisa Dashi
(TUM)
Description
The continuum of electron-positron pairs, produced in heavy ion collisions, provides an excellent
probe of the quark-gluon plasma. To extract possible signatures, it is important to work with an
electron sample of high purity. Dielectrons are also studied in proton-proton collisions to provide a
crucial reference.
This poster presents an analysis performed on a data set of pp collisions at √s = 7 TeV measured with
the ALICE detector at the Large Hadron Collider. The aim of the work is to optimize the electron
identification and to reduce the hadron contamination. For that, invariant mass spectra of electronpositron
pairs based on three different PID sets are compared and the hadron contamination of the
dielectron sample is estimated as a function of invariant mass. The analysis shows that one can
achieve good electron identification efficiencies and a single electron purity higher than 90% by
combining the signals of the ITS, TPC and TOF detectors in ALICE
Primary author
Mrs
Anisa Dashi
(TUM)
