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G. Giacalone

Publications and source records attributed to G. Giacalone.

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Topical issue on the intersection of low-energy nuclear structure and high-energy nuclear collisions

High-energy heavy-ion physics and low-energy nuclear structure physics have historically been disconnected fields. The hydrodynamic description of the quark-gluon plasma (QGP) requires input from nuclear structure to model the initial states of the colliding nuclei. Advances in both theory and experiment now show that the hydrodynamic evolution of the QGP is sensitive to the detailed features of the colliding nuclei, with remarkable consequences for experimental observables. The topical collection represents a joint effort between the low- and high-energy nuclear communities, reflecting the growing recognition that precision modeling of nuclear structure is essential for interpreting high-energy collision data. This new experimental approach opens outstanding opportunities to deepen our understanding of strong-interaction matter. Indeed, by probing many-body correlations of nucleons directly in the nuclear ground state, high-energy collisions provide a unique way to "image" nuclei, fully complementary to the techniques of low-energy experiments, where nuclear collectivity is usually inferred from spectroscopic information on excited states. Do emergent many-body QCD phenomena in nuclei manifest consistently across experiments and energy scales? Addressing this question requires synergy between collider data and state-of-the-art nuclear structure calculations. In view of the rapid progress of ab initio methods based on low-energy effective field theories of QCD, the implications are far-reaching: heavy-ion collisions can probe nuclear forces, while nuclear structure insights refine our understanding of QGP dynamics.

nucl-th

Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams

The future opportunities for high-density QCD studies with ion and proton beams at the LHC are presented. Four major scientific goals are identified: the characterisation of the macroscopic long wavelength Quark-Gluon Plasma (QGP) properties with unprecedented precision, the investigation of the microscopic parton dynamics underlying QGP properties, the development of a unified picture of particle production and QCD dynamics from small (pp) to large (nucleus--nucleus) systems, the exploration of parton densities in nuclei in a broad ($x$, $Q^2$) kinematic range and the search for the possible onset of parton saturation. In order to address these scientific goals, high-luminosity Pb-Pb and p-Pb programmes are considered as priorities for Runs 3 and 4, complemented by high-multiplicity studies in pp collisions and a short run with oxygen ions. High-luminosity runs with intermediate-mass nuclei, for example Ar or Kr, are considered as an appealing case for extending the heavy-ion programme at the LHC beyond Run 4. The potential of the High-Energy LHC to probe QCD matter with newly-available observables, at twice larger center-of-mass energies than the LHC, is investigated.

hep-ph