Conveners
Parallel Session 4
- Ian Gardner Bearden (University of Copenhagen (DK))
- Ian Gardner Bearden (Niels Bohr Institute)
In relativistic heavy ion collisions, the charged ions produce an intense flux of equivalent photons. Thus, photon-induced processes are the dominant interaction mechanism when the colliding nuclei have a transverse separation larger than the nuclear diameter. In these ultra-peripheral collisions (UPCs), the photon provides a clean, energetic probe of the partonic structure of the nucleus,...
Gluons are found to become increasingly dominant constituents of nuclear matter when being probed at higher energies or smaller Bjorken-$x$ values. This has led to the question of the ultimate fate of nuclear gluonic structure and its interaction with external probes at extreme density regimes when approaching the limit allowed by unitarity. In ultraperipheral collisions (UPCs) of relativistic...
Photon-induced reactions in ultra-peripheral collisions (UPCs) of heavy nuclei at the LHC have been studied using the ALICE detector for several years. The ALICE detector can measure the photoproduction cross section for vector mesons at various rapidities, centre-of-mass energies and collision systems. Beyond the recent ALICE studies of the rapidity and momentum transfer dependence of...
Quarkonium measurements in heavy-ion collisions provide insight into the mechanisms which cause the quarkonium bound states to dissociate in the Quark-Gluon Plasma (QGP). The $J/\psi$ suppression and $\Upsilon$ sequential melting provide information on the thermodynamic properties of the QGP, in particular the initial medium temperature. Quarkonium studies in $p$+$p$ and $p$+A collisions serve...
FoCal is a high-granularity forward calorimeter to be installed as an ALICE upgrade subsystem during the LHC Long Shutdown 3 and take data during the LHC Run 4. It consists of a compact silicon-tungsten sampling electromagnetic calorimeter (FoCal-E) with pad and pixel longitudinal and transverse segmented readout layers to achieve high spatial resolution for discriminating between isolated...
The Forward Calorimeter (FoCal) in ALICE, which is planned to take data in Run 4, covers a pseudorapidity interval of 3.4 < η < 5.8 for probing non-linear QCD dynamics in an unexplored kinematic region at the LHC.
In its electromagnetic section, layers of high granularity Monolithic Si pixels are alternated to Si pads for sampling the longitudinal development of the electromagnetic showers,...
The gluon distribution function grows rapidly with decreasing momentum fraction $x$. However, the total scattering cross section is bound by unitarity, which requires that the increase of gluon density be tamed. This is explained by gluon recombination under the color glass condensate (CGC) framework. A definitive discovery of nonlinear effects in QCD and the saturation regime would...
