Heavy-flavour correlations in pp, p-Pb and Pb-Pb collisions with ALICE

31st Winter Workshop on Nuclear Dynamics

Bjelogrli, S.^1

Princetonplein 5, Utrecht

3584 CC, Netherlands^1

关键词: Angular correlations;    Azimuthal correlations;    Color glass condensates;    Energy loss mechanisms;    Heavy ion collision;    Long range correlations;    Production cross section;    Scattering process;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/636/1/012002/pdf
DOI  :  10.1088/1742-6596/636/1/012002

来源: IOP

【 摘 要 】

Heavy quarks (charm and beauty) are produced in initial hard scattering processes in heavy-ion collisions, before the formation of a strongly-interacting medium, the Quark-Gluon Plasma (QGP). The measurement of angular correlations between open heavy-flavour hadrons and charged particles can provide insight into the effects of the medium on charm and beauty production. For instance, in Pb-Pb collisions, the azimuthal correlations can provide information on the energy-loss mechanisms of heavy quarks in the QGP. Additionally, azimuthal correlations are sensitive to possible modifications of the heavy-quark parton shower and hadronisation in the presence of the medium. The observed double-ridge long-range correlations between light hadrons in p-Pb collisions could originate from a collective expansion of the system, as well as from gluon saturation in the initial state (color-glass condensate). The same effect can be studied for heavier quarks via the correlation between heavy-flavour hadrons (or their decay electrons) and charged particles. In pp collisions, the azimuthal correlations allow to measure the beauty production cross section as well as they represent a powerful tool to test pQCD models.