The ALICE experiment was proposed in 1993, to study strongly-interacting matter at extreme
energy densities and temperatures. This proposal entailed a comprehensive investigation of …

Ultraperipheral collisions (UPCs) of heavy ions and protons are the energy frontier for
electromagnetic interactions. Both photonuclear and two-photon collisions are studied at …

Light-by-light scattering (γγ→ γγ) is a quantum-mechanical process that is forbidden in the
classical theory of electrodynamics. This reaction is accessible at the Large Hadron Collider …

Ultra-peripheral collisions (UPCs) have been a significant source of study at RHIC and the
LHC. In these collisions, the two colliding nuclei interact electromagnetically, via two-photon …

We discuss the physics of large impact parameter interactions at the LHC: ultraperipheral
collisions (UPCs). The dominant processes in UPCs are photon–nucleon (nucleus) …

▪ Abstract Moving highly-charged ions carry strong electromagnetic fields that act as a beam
of photons. In collisions at large impact parameters, hadronic interactions are not possible …

We investigate the impact of soft gluon resummation on the azimuthal angle correlation
between the total and relative momenta of two energetic final-state particles (jets). We show …

Hot QCD physics studies the nuclear strong force under extreme temperature and densities.
Experimentally these conditions are achieved via high-energy collisions of heavy ions at the …

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 …

This paper investigates the electromagnetic production of lepton pairs with low total
transverse momentum in relativistic heavy-ion collisions. We estimate the initial photons' …