Effects of saturation and fluctuating hotspots for flow observables in ultrarelativistic heavy-ion collisions
Year: 2024
Type: article
Abstract: We investigate the effects of saturation dynamics on midrapidity flow observables by adding fluctuating hotspots into the novel Monte Carlo EKRT (MC-EKRT) event generator for high-energy nuclear collisions. We demonstrate that the intensity of the saturation effects significantly affects the ratio between the flow coefficients v 3 and v 2 at the LHC. Adding a hotspot substructure to the nucleons enhances the saturation effects and improves the agreement with the measured data. We show that the collision-energy dependence of the flow coefficients obtained using the MC-EKRT initial states with hotspots is improved in comparison with the earlier event-by-event EKRT model. In addition, we present the results for the charged hadron multiplicity distribution in Pb + Pb collisions at the LHC, and show that the minijet multiplicity originating fluctuations of the saturation scale included in MC-EKRT, as well as the presence of hotspots, are necessary for describing the measured large-multiplicity tail in the distribution. Published by the American Physical Society 2024
Source: Physical Review C
Institutions: Helsinki Institute of Physics, University of Jyväskylä
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G14744916, G2583114034, G3019630846, G3111662533, The strong interaction at the frontier of knowledge: fundamental research and applications, Center of Excellence in Quark Matter, G434337789, Nuclear parton distributions and QCD matter properties from LHC data, G7567520714, Center of Excellence in Quark Matter
OpenAlex ID: W4402678397