QCD-aine äärimmäisissä olosuhteissa


Rahoittajan antama koodi/diaarinumero: 338263

Päärahoittajan myöntämä tuki (€)

  • 447 650,00


Hankkeen aikataulu

Hankkeen aloituspäivämäärä: 01.09.2021

Hankkeen päättymispäivämäärä: 31.08.2026


In this project the properties of the nuclear matter with emergent non-linear effects at extremely large gluon densities are theoretically determined. This is achieved by studying the Quantum Chromodynamics (QCD), describing the strong interactions between quarks and gluons, at high energies.

We develop the effective field theory approach to describe QCD at high energies to the new level of accuracy where precision studies at next-to-leading order (NLO) in perturbation theory are possible. These developments combined with our new computational approaches allow us to figure out whether the non-linear effects are visible in current collider experiments, and also to determine how the nuclear structure at high energies is affected by the non-linear QCD dynamics.

We take the advantage of the latest developments in the LHC experiments, where photon-nucleus interactions are measured in ultraperipheral heavy ion collisions, and constrain the event-by-event fluctuating structure of protons and nuclei at high energies. We also determine which observables in the next generation Electron-Ion Collider (EIC) are most powerful in probing the properties of the nuclear matter at extremely large parton densities and develop the CGC theory to the level where precision level studies are possible in the future EIC.

The obtained detailed description of the partonic structure of nuclei is applied to describe the initial stages of the collisions of heavy nuclei. In such events, the Quark Gluon Plasma (QGP) is produced, and description of the initial state is a crucial input for hydrodynamical modelling of the plasma evolution. We determine how the extraction of QGP properties is affected by the obtained new picture of the initial state, and if the observed signatures of collective phenomena seen in collisions of small systems at the LHC can be explained by the rigorously constrained initial state effects. We also figure out which measurements in the future EIC are most powerful in constraining the unknown aspects of the initial state of QGP formation, and estimate the effect of EIC measurements on the interpretation of the LHC high multiplicity events.

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