München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Heavy-Ion Collisions and QCD Phases IX
HK 48.4: Talk
Thursday, March 21, 2019, 15:00–15:15, HS 15
Dielectron production in p-Pb collisions at sqrt(sNN)= 5.02 TeV with ALICE — •Sebastian Scheid for the ALICE collaboration — IKF, Uni Frankfurt
Dileptons are a prime probe of the deconfined state of strongly-interacting matter, the Quark-Gluon Plasma (QGP), produced in high-energy heavy-ion collisions, as they are not affected by final-state interactions and produced at all stages of the collision. A measurement of the thermal radiation from the QGP in the dielectron intermediate-mass region gives information on the medium temperature.
In this region, the main component of the dielectron continuum is coming from correlated semi-leptonic decays of D- and B-mesons, which may be affected by the interaction of the heavy quarks with the QGP or the modification of their production cross section via the parton distribution function in the heavy nuclei with respect to protons. The latter can be studied in proton-lead collisions. Moreover, a small contribution from thermal radiation from the hadronic and partonic phase of the collision is predicted in such collision systems.
In this talk, first measurements of correlated e+e− pairs in p-Pb collisions at √sNN = 5.02 TeV with ALICE will be presented. In particular, we will show how the distance of closest approach (DCA) of the electrons to the primary vertex of the collision gives experimental means to single out dielectrons from heavy-flavour decays and provides constraints on a possible contribution from thermal radiation.