Quark Matter 2018

Dielectron production in Pb-Pb collisions at sNN=5.02 TeV with ALICE

15 May 2018, 17:00

2h 40m

First floor and third floor (Palazzo del Casinò)

Poster Electromagnetic and weak probes Poster Session

Speaker

Carsten Klein (Johann-Wolfgang-Goethe Univ. (DE))

Description

Electron-positron pairs are an excellent probe to investigate the properties of the Quark-Gluon Plasma (QGP) created in ultra-relativistic heavy-ion collisions. Because they are produced at all stages of the collision and do not interact strongly with the medium, their spectra reflect the entire space-time evolution of the system. At low invariant mass ($m_{\text{ee}}<1.2{\text{ GeV/c}}^2$), the dielectron production is sensitive to the properties of vector mesons in the dense medium which is related to the predicted restoration of the chiral symmetry. In the intermediate-mass region ($1.2<m_{\text{ee}}<2.9{\text{ GeV/c}}^2$), the dielectron continuum gives further insight into the heavy-quark energy loss in the QGP via the measurement of correlated electron-positron pairs from charm- and beauty- hadron decays. Finally, contributions of thermal radiation from the medium, both during the partonic and the hadronic phases, are predicted in a broad mass range and provide information on the temperature of the system.

In this poster, the status of the dielectron measurements in Pb-Pb collisions at $\sqrt{s_{\text{NN}}}=5.02\text{ TeV}$ with ALICE will be presented. In order to interpret the data, the findings will be compared to the expected yield of known hadronic sources, i.e. the hadronic cocktail, as a function of the invariant mass and pair transverse momentum. Finally, the status of the measurement of virtual direct photons and modifications of the dielectron yield in Pb-Pb collisions will be discussed.

Presentation materials

2018-may-09-conference_presentation-poster_0.pdf