Abstract
This paper reviews recent experimental results on hard probes in heavy-ion collisions from the ALICE and STAR Collaboration. These studies include various observables characterizing jet properties like nuclear modification factors, recoil jet yields, di-jet and photon-jet energy imbalance, and the observables characterizing jet properties like jet fragmentation function and jet shapes; and measurements of high-pT charged hadrons from jet fragmentation and triggered particle correlations will be highlighted.
Highlights
The experimental heavy-ion program aims to explore the phases of nuclear matter, the structure of the nucleus and the nucleons, and the properties of the Quark Gluon Plasma (QGP), the primordial state of matter that exists during a few hundreds of microseconds in the early universe until the hadron phase transition
Extending the study of quantum chromodynamics (QCD) to dynamical, complex systems will let us learn how macroscopic properties of matter emerge from the fundamental microscopic laws of particle physics
Transport properties, linked to the strong interaction properties at high temperature and high color-charge density as well as macroscopic properties of the QGP, can be inferred by studying how elementary particles of the Standard Model propagate through the medium
Summary
The experimental heavy-ion program aims to explore the phases of nuclear matter, the structure of the nucleus and the nucleons, and the properties of the Quark Gluon Plasma (QGP), the primordial state of matter that exists during a few hundreds of microseconds in the early universe until the hadron phase transition. Jet quenching is a phenomenon that has been observed for all hadron species at high pT as a pronounced suppression of the production in heavy-ion collisions relative to pp collisions These high pT hadrons originate from hard scattered partons produced in the initial stage of the collisions and lose energy while traversing the medium. It is well established that the parton energy loss is a consequence of the modification of the hard-scattering processes in the final state of the heavy ion collisions at RHIC and LHC [2,3,4,5], which is accompanied by an enhancement of low pT hadrons, suggesting a softening of jet fragmentations. The measurements of tagged jet fragmentation properties using triggered particle correlations will be highlighted
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