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Abstract
The ALICE (A Large Ion Collider Experiment) detector at the LHC (Large Hadron Collider) is dedicated to the study of the properties of the hot and dense QCD matter (Quark–Gluon Plasma) produced in the nucleus-nucleus collisions at high energy. Heavy quarks (charm and beauty), having large masses, are produced in the hard-parton scattering in the early stages of the collision. Therefore, they experience the whole evolution of the hot and dense medium, representing an important tool for its characterization. The study of angular correlations between D mesons and charged particles in Pb–Pb collisions gives insight about the energy loss of charm quarks and the medium-induced modification of its fragmentation into jets. Moreover, pp collisions help to understand the production mechanisms, fragmentation and hadronization of charm quarks and acts as a reference for p–Pb and Pb–Pb measurements. In this article, the measurement of azimuthal correlations between D0 meson and charged particles in pp collisions at $\sqrt s = 13$ TeV is presented. The collisional energy dependence of the correlations is extracted from the comparison with the results at $\sqrt s = 7$ TeV. The data are also compared with simulations performed with different event generators.
Highlights
The collisions of heavy ions at ultrarelativistic energies provide an excellent way to study the hot and dense QCD medium formed under extreme conditions: the Quark–Gluon Plasma (QGP)
The background from combinatorial D meson candidates are removed by defining a background region in the sidebands of the invariant-mass distribution as the interval 4 < |m − mpdg | < 8, where mpdg is the mass of D meson taken from PDG database [4]
In the away-side POWHEG+PYTHIA6 and PYTHIA8 are closer to the data than PYTHIA6
Summary
The collisions of heavy ions at ultrarelativistic energies provide an excellent way to study the hot and dense QCD medium formed under extreme conditions: the Quark–Gluon Plasma (QGP). Heavy quarks (charm and beauty), having large masses, are produced in the initial stages of the collision in hard parton scatterings. They experience the whole evolution of the hot and dense medium, representing an important tool for its characterization. The study of angular correlations between D mesons and charged particles in different collision systems provides information about the possible medium-induced modification of charm quark fragmentation into jets. In pp collisions, this measurement allows the study of the production mechanisms, fragmentation and hadronization of charm quarks. The various subsystems of the ALICE apparatus and their performance are described in more detail in [1, 2]
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