München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Heavy-Ion Collisions and QCD Phases II

HK 11.3: Talk

Monday, March 18, 2019, 17:15–17:30, HS 15

Study of the charm quark production mechanisms through angular correlation of dielectrons in pp collisions at √s = 13 TeV — •Hermann Degenhardt for the ALICE collaboration — Excellence Cluster Universe, TUM, Munich, Germany

The aim of relativistic heavy-ion collisions is to investigate the properties of the Quark-Gluon Plasma (QGP) that is formed at high-enough temperatures and/or densities. Heavy-quarks, i.e. charm and beauty, are very useful probes for the characterization of the QGP since they are produced at the early stages of the collisions via initial hard scatterings. To quantify the QGP effects, it is important to understand the heavy-quark production in pp collisions first. In particular, the production mechanisms of charm quarks can be studied through their angular correlations which is inherited by their decay products, such as electrons.

In the leading order the heavy-flavour pair is created back to back through flavour creation. On the other hand, higher order processes like flavour excitation and gluon splitting create pairs with different angular correlation functions. While gluon splitting produces pairs with small angles, flavour excitation processes produce pairs without preferred angular correlation. In this talk we present the current analysis of angular distribution functions between correlated heavy-flavour electron-positron pairs in proton-proton collisions at a centre of mass energy √s = 13 TeV and the comparison with simulated mechanisms processes obtained by PYTHIA.