54. International Winter Meeting on Nuclear Physics

25-29 January 2016
Bormio, Italy
Europe/Berlin timezone

Electron Identification and Hadron Contamination Studies in Proton-Proton Collisions with ALICE

25 Jan 2016, 17:42
2m
Bormio, Italy

Bormio, Italy

Poster Relativistic Heavy Ion Physics

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)

 Slides