Conveners
:: Jets 1
- Elena Bratkovskaya (GSI Helmholtz Centre for Heavy Ion Research and Frankfurt University, Germany)
:: Jets 3
- Carlota Andrés (Centre de physique théorique (CPHT) - École polytechnique, France)
:: Experimental advances
- Lidija Zivkovic (Institute of Physics Belgrade, Serbia)
The energy loss of fast partons (quarks or gluons) in relativistic heavy-ion collisions can provide information on parton energy-loss mechanisms in a quark-gluon plasma (QGP) and serve to probe its microscopic structure. Understanding the parton energy-loss processes as partons propagate through a QGP requires measurement of large transverse momentum (high-pT) hadrons and jets. Suppression of...
QCD jets play a central role in probing QCD at high precision and in new physics searches at colliders. They are also extensively studied in ultra relativistic heavy ion collisions as multi-dimensional probes of the quark gluon plasma (QGP) that is created in the aftermath of the collisions. While the theory for jet evolution in vacuum is well established, in the presence of a hot and dense...
We present a new approach to jet substructure in heavy-ion collisions based on the study of correlation functions of energy flow operators (energy correlators). This approach is based on the insight that the dynamics of the QGP is imprinted at specific time scales in the jet, which will be reflected as changes in the shape of the correlator. We analyze the two-point correlator of an in-medium...
The initial pre-equilibrium stage of a heavy ion collision can have a significant impact on hard probes of the quark gluon plasma such as jets and heavy quarks. In weak coupling QCD the properties of this pre-equilibrium phase can be understood by effective kinetic theory, which can follow the development of the system from the glasma to hydrodynamics. We compute the jet quenching parameter...
We study the interaction of leading jet partons in a strongly interacting quark-gluon plasma (sQGP) medium based on the effective dynamical quasi-particle model (DQPM). The DQPM describes the non-perturbative nature of the sQGP at finite temperature T and baryon chemical potential μB based on a propagator representation of massive off-shell partons (quarks and gluons) whose properties...
Typically, the bulk properties of Quark Gluon Plasma (QGP) are studied using the low-pt data. However, the high-pt probes can also serve as powerful tomography tools, since they are sensitive to global QGP features, such as different temperature profiles or initial conditions. In this study, we try to determine if it is possible to constrain the η/s of the medium formed in the heavy-ion...
We present a new model for jet quenching from coherent radiation in a brick medium. The jet energy loss is simulated as a perturbative final-state vacuum parton shower followed by a medium-induced shower originating from elastic and radiative collisions with the medium constituents. Coherency is achieved by starting with trial gluons that acts as field dressing of the initial jet parton. These...
The strongly-coupled nature of the quark-gluon plasma was discovered nearly twenty years ago. Since that time, we have learned a great deal about the sQGP and its transport properties, but the question of how quarks and gluons, the microscopic degrees of freedom, produce the near-perfect liquid properties observed in the bulk remains open. The sPHENIX experiment, the first collider detector...
The ALICE collaboration pursues several upgrades to further extend the reach of heavy-ion physics at the LHC. For LHC Run 4 (2029-2032), ALICE is pioneering the use of bent, wafer-scale pixel sensors to produce truly cylindrical tracking layers with very low material budget to replace the three innermost layers of the inner tracking system. The resulting improvement in pointing resolution will...
Hydrodynamic simulations of the quark-gluon plasma (QGP) permit us not only to gauge the transport properties of hot QCD matter from data, but also to constrain the conditions that set the stage for the formation of such matter. Recent measurements from RHIC and LHC demonstrate that the QGP initial condition is impacted by the shape and radial structure of the colliding nuclei. Based on a...
Heavy quark production represents one of the main tools for the QGP characterization, as shown by the vast amount of results obtained in nuclear collisions at collider energies. At fixed-target energies, these measurements become more difficult because of the vanishing production cross sections, and for the moment only charmonium results at top SPS energy (sqrt(s_NN)=17 GeV) are available. A...
