Speaker
Description
In this talk we present the results of application of the Monte Carlo
modified Glauber model [1], [2], [3] for the predictions of collision centrality dependence of the total charged-particle yields for 16O +16O and 20Ne+20Ne colliding systems at the LHC.
Our model differs from the Standard Glauber model by the effective account of the energy losses in successive inelastic nucleon-nucleon collisions. For this purpose, a single model parameter k is defined as a mean fraction of momentum loss in each inelastic binary nucleon collision. Therefore, the decrease of momentum after each inelastic collision is followed by the associated decrease of the inelastic cross section and of the mean multiplicty yield, both are taken into account in the MC model in the next inelastic binary interaction.
The value of k is obtained by fitting the available data on the total chtarged-particle multiplicity yields measured in high-energy nucleus-nucleus collisions. Thus a single-parameter model provides good decription [3] for the nonlinear effects in multiplicity yields as a function of number of participating nucleons (Npart) observed in Pb+Pb collisions at RHIC and the LHC. To predict the dependence of the total charged-particle yields for light (16O +16O and 20Ne+20Ne) colliding systems, we use the modified Glauber model with the same value of k as defined in Pb+Pb collisions at 2.76 and 5.02 TeV. Results show, that in both cases of 16O +16O and 20Ne+20Ne colliding systems, the multiplicty yields, normalised on pairs of Npart, will linearly grow with Npart. This behaviour is different from the one of the heavy ion collisions. It is qualitively similar only to the one obseved in very peripheral Pb+Pb collsiions.
We discuss the purely geometrical effects for these light colliding systems that could be considered useful in future studies of QGP properties in energy density scanning.
The authors acknowledge Saint-Petersburg State University for a research project 103821868
[1] Feofilov G. A., Ivanov A. A. // Journal of Physics G: Nuclear and Particle Physics. – 2005. – Vol. 31, No. 5. – P. 230-237.
[2] G. A. Feofilov and A. Yu. Seryakov, AIP Conf. Proc. 1701, 070001 (2016); DOI:10.1063/1.4938686
[3] S. Simak and G. A. Feofilov, Phys. Part. Nucl. 56, 877 (2025).
