Conveners
Session 6
- Marek Gazdzicki (Jan Kochanowski University in Kielce)
We work out the Hopfion description of glueballs by inclusively comparing the energy spectra obtained by quantizing Hopfions with experimental data and lattice QCD. Identifying a Hopfion carrying a unit topological charge as f0(1500), the Hopfions with the topological charge two are classified as glueballonia, i.e., two glueballs are bound together. We find a tightly and a loosely bound...
The Wróblewski factor, proposed 40 years ago [1] and still widely used, is a measure of strangeness production compared to the light quark production. The method is based on the direct comparison of the number of quarks in produced particles. Several assumptions were needed as not all particles have been measured.
Numerous multiplicities of particles (charged and several neutrals) produced...
In the standard picture of heavy-ion collisions, it seems that a large part of the evolution of the produced fireball can be described in terms of classcal theories: relativistic hydrodynaics, the relativistic Boltzmann equation. The quantum effects seem to be restrivcted to the very initial stages, and the computation of some material properties, for instance the transport...
Based on a generalized Beth-Uhlenbeck approach to thermodynamics of QCD motivated by cluster decomposition we present a unified equation of state of hot strongly interacting matter and analyze its properties in a wide range of temperatures. The hadrons are treated as color singlet multiquark clusters in medium with a background gluon field in the Polyakov gauge. The confining aspect of QCD is...
CP violation is known to emerge at finite topological angle, including $\theta=\pi$, which can be related to a negative quark mass parameter. Such a phase with nonstrange and strange eta condensates was indeed identified also in the Columbia plot in the presence of the axial anomaly [2410.08185]. However, anomaly terms corresponding to different topological charge give rise to different...
HADES is an experiment located at the SIS-18 accelerator in GSI, Darmstadt,
Germany. It is a detector setup primarily developed for precise measurements of
dielectrons, but it soon found other uses, including femtoscopy. High angular
acceptance and interaction rates enable the collection of large quantities of
high-quality data, making them useful for any type of analysis. HADES is...
Exploring correlations between photon pairs is a challenging frontier in the field of femtoscopic measurements. Unlike hadrons, direct photons escape the hot and dense medium without final-state interactions, carrying pristine information from the earliest moments of the collision. Therefore, they offer a unique possibility to probe the initial space-time dynamics of the system. Additionally,...
The current theoretical estimations lead to cross-sections for $AA \to \gamma \gamma AA$ which are somewhat smaller than the measured ones by the ATLAS and CMS Collaborations, In our recent paper, we estimated the contribution of inelastic channels to the Light-by-Light (LbL) scattering in ultraperipheral collisions (UPC) of heavy ions, in which one or both of the incident nuclei dissociate ...
