Abstract
ALICE (A Large Ion Collider Experiment) is designed to study the strongly in teracting matter, the Quark-Gluon Plasma (QGP), created in heavy-ion collisions at LHC energies. Charm and beauty quarks are powerful probes to study the QGP. Produced in hard partonic scattering processes on a short time scale, they are expected to traverse the QCD medium, interacting with its constituents and losing energy through radiative and collisional processes. In ALICE, open-charm production is studied through the reconstruction of the hadronic decays of D 0 , D + , D *+ and D s + mesons at mid-rapidity. High precision tracking, good vertexing capabilities and excellent particle identification offered by ALICE allow for the measurement of particles containing heavy quarks (particularly D mesons) in a wide transverse momentum range in pp, p-Pb and Pb-Pb collisions. A review of the main results on D-meson production in pp collisions at √s = 7 TeV, p-Pb collisions at √s NN = 5.02 TeV and Pb-Pb collisions at √s NN = 2.76 TeV will be presented.
Highlights
The ALICE experiment at the LHC aims to investigate the properties of the Quark-Gluon Plasma (QGP), the hot and dense state of strongly-interacting matter produced in high-energy heavy-ion collisions
√ section measurements of prompt D mesons were performed with ALICE in pp collisions at s = 7 TeV and 2.76 TeV [11,12,13] and found well described
3.4 Results in Pb-Pb collisions In Pb-Pb collisions, the open heavy-flavour RAA measured with ALICE for D0, D+, D∗+ [36] [37] and for D+s [38] shows a strong reduction of the yields at large transverse momenta in the most central collisions relative to a binary-scaled pp reference
Summary
The ALICE experiment at the LHC aims to investigate the properties of the Quark-Gluon Plasma (QGP), the hot and dense state of strongly-interacting matter produced in high-energy heavy-ion collisions. Theoretical calculations based on Quantum Chromo-Dynamics (QCD) predict a dependence of the energy loss on the colour charge and on the mass of the parton traversing the medium. Further knowledge of the properties of the medium created in heavy-ion collisions can be gained from the study of the azimuthal anisotropy of open heavy flavours: the initial spatial asymmetry of non-central collisions is transformed into an asymmetry in momentum via hydrodynamic expansion of the medium. This is quantified in terms of the second coefficient ν2 in a Fourier expansion of the. The contribution from B-meson decay feed-down is subtracted, based on FONLL calculations and on data-driven approach, in order to obtain the prompt D-meson yields
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