TY  - JOUR
A1  - Gaebel, Vincent
A1  - Bonne, Michel
A1  - Reichert, Tom Andre
A1  - Burnic, Ajdin
A1  - Hillmann, Paula
A1  - Bleicher, Marcus
T1  - Understanding the energy dependence of B2 in heavy ion collisions: interplay of volume and space-momentum correlations
T2  - The European physical journal. A
N2  - The deuteron coalescence parameter 𝐵2 in proton+proton and nucleus+nucleus collisions in the energy range of √s N N = 900–7000 GeV for proton + proton and √s N N = 2–2760 GeV for nucleus + nucleus collisions is analyzed with the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) transport model, supplemented by an event-by-event phase space coalescence model for deuteron and anti-deuteron production. The results are compared to data by the E866, E877, PHENIX, STAR and ALICE experiments. The 𝐵2 values are calculated from the final spectra of protons and deuterons. At lower energies, √s N N ≤ 20 GeV, B2 drops drastically with increasing energy. The calculations confirm that this is due to the increasing freeze-out volume reflected in B2 ∼ 1/V . At higher energies, √s N N ≥ 20 GeV, B2 saturates at a constant level. This qualitative change and the vanishing of the volume suppression is shown to be due to the development of strong radial flow with increasing energy. The flow leads to strong space-momentum correlations which counteract the volume effect.
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/74732
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-747326
SN  - 1434-601X
N1  - This work was supported by the Deutscher Akademischer Austauschdienst (DAAD), HIC for FAIR and in the framework of COST Action CA15213 THOR. The computational resources were provided by the Center for Scientific Computing (CSC) of the Goethe University Frankfurt. Open Access funding enabled and organized by Projekt DEAL.
VL  - 57
IS  - 2, art. 55
SP  - 1
EP  - 7
PB  - Springer
CY  - Berlin ; Heidelberg
ER  -