Abstract
The ALICE experiment studies the properties of the strongly-interacting matter created in high energy heavy-ion collisions, called Quark-Gluon Plasma (QGP). Heavy quarks are a powerful probe for investigating such a state of matter, since they are predominantly produced in the first hard scattering processes and they bring to the final state information on the deconfined phase. Heavy-flavour particles are reconstructed via hadronic and semi-leptonic decays in the ALICE detector. The measurements of the modification of the heavyflavour hadrons transverse momentum distribution in Pb‐Pb collisions with respect to pp and of their azimuthal anisotropy show that heavy quarks have a sizeable interaction with the medium constituents.
Highlights
The ALICE experiment studies the properties of the strongly-interacting matter created in high energy heavyion collisions
Heavy quarks are a powerful probe for investigating such a state of matter, since they are predominantly produced on a short time scale in hard scattering processes during the early stage of the collision and are expected to be sensitive to its energy density, through the mechanism of parton energy loss
Two complementary electron identification approaches are used. Both approaches require that the specific energy loss, dE/dx, measured in the Time Projection Chamber (TPC), is compatible with the expected electron dE/dx
Summary
The ALICE experiment studies the properties of the strongly-interacting matter created in high energy heavyion collisions. Heavy quarks are a powerful probe for investigating such a state of matter, since they are predominantly produced on a short time scale in hard scattering processes during the early stage of the collision and are expected to be sensitive to its energy density, through the mechanism of parton energy loss. This QCD energy loss is expected to occur via both inelastic (medium-induced gluon radiation, or radiative energy loss) [1] and elastic (collisional energy loss) [2] processes. At high pT, it can constrain the path-length dependence of parton energy loss, complementing the measurement of the nuclear modification factor RAA
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