Dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC

Abstract

Electromagnetic probes are excellent messengers from the hot and dense medium created in high-energy heavy-ion collisions. Since leptons do not interact strongly, their spectra reflect the entire space-time evolution of the collision. The surrounding medium can lead to modifications of the dielectron production with respect to the vacuum rate. To quantify modifications in heavy-ion collisions, measurements in pp collisions serve as a reference, while the analysis of p-A collisions allows for the disentanglement of cold nuclear matter effects from those of the hot and dense medium. In this proceedings, dielectron measurements with the ALICE central barrel detectors are presented. The invariant mass distributions in the range $0<m_{ee}<3$ GeV/$c^2$ are compared to the expected yields from hadronic sources for pp collisions at $\sqrt{s}=7$ TeV, and for p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. The cross section of direct photons measured via virtual photons in pp collisions is compared to predictions from NLO pQCD calculations as a function of the transverse momentum. The status of the analysis of Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV is presented.

4 pages, 8 figures, Proceedings of the "Quark Matter 2014 Conference", XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Darmstadt, May 19-24 2014

References in corpus (1)

• PYTHIA 6.4 Physics and Manual

Cited by in corpus (11)

• Effective QCD and transport description of dilepton and photon production in heavy-ion collisions and elementary processes
• Heavy-ion collisions at the Large Hadron Collider: a review of the results from Run 1
• Coherent lepton pair production in hadronic heavy ion collisions
• Photon and dilepton production at the Facility for Antiproton and Ion Research and the beam energy scan program at the Relativistic Heavy-Ion Collider using coarse-grained microscopic transport simulations
• Measurement of Meson Resonance Production in ${\pi }^{-}+$C Interactions at SPS energies
• Coherent photo-produced J$/\psi$ and dielectron yields in isobaric collisions
• Phenomenology of photon and di-lepton production in relativistic nuclear collisions
• Overview of ALICE Results at Quark Matter 2014
• The low and intermediate mass dilepton and photon results
• Non-equilibrium dilepton production in hadronic transport approaches
• Low-Mass Dielectron Production in pp, p-Pb and Pb-Pb Collisions with ALICE