Bonn 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Bonn musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 34: Heavy-Ion Collisions and QCD Phases VII
HK 34.2: Vortrag
Mittwoch, 1. April 2020, 17:00–17:15, J-HS F
Low-mass dielectron measurements in minimum-bias pp collisions at 5.02 TeV with ALICE — •Leonhardt Viebach for the ALICE collaboration — Goethe Universität Institut fur Kernphysik, Johann Wolfgang Goethe-Universitat Frankfurt (IKF), Frankfurt, Germany
Low-mass dielectrons play a key role in the understanding of the chiral-symmetry restoration and in the study of the Quark-Gluon Plasma (QGP). To single out the interesting signal characteristics of the QGP, the primordial e+e− pair production in vacuum needs to be first understood. It can be studied in minimum-bias pp collisions. Dielectron measurements in elementary collision systems serve not only as a reference for the heavy-ion analysis but provide also a test for Monte-Carlo event generators, aiming to reproduce the heavy-flavour production mechanisms. In this talk, I will present the results of the dielectron analysis in pp collisions at √s = 5.02 TeV with ALICE. The dielectron yield is studied as a function of invariant mass and pair transverse momentum and compared to the expected dielectron yield from known hadronic sources. The charm and beauty production cross sections are extracted from the data by fitting the spectra in the intermediate-mass region and are then compared to measurements at √s = 7 TeV and √s = 13 TeV as well as to single heavy-flavour hadron measurements and to FONLL calculations. Finally, the results in pp collisions can be compared to Pb–Pb and p–Pb results measured at the same center of mass energy per nucleon, √sNN = 5.02 TeV, which allows a direct comparison to estimate cold- and hot-nuclear matter effects.