Understanding the energy dependence of B2 in heavy ion collisions: interplay of volume and space-momentum correlations
- 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.
Author: | Vincent GaebelORCiD, Michel Bonne, Tom Andre ReichertORCiDGND, Ajdin Burnic, Paula HillmannORCiD, Marcus BleicherORCiDGND |
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URN: | urn:nbn:de:hebis:30:3-747326 |
DOI: | https://doi.org/10.1140/epja/s10050-020-00307-5 |
ISSN: | 1434-601X |
Parent Title (English): | The European physical journal. A |
Publisher: | Springer |
Place of publication: | Berlin ; Heidelberg |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2021/02/09 |
Date of first Publication: | 2021/02/09 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Release Date: | 2023/09/12 |
Volume: | 57 |
Issue: | 2, art. 55 |
Article Number: | 55 |
Page Number: | 7 |
First Page: | 1 |
Last Page: | 7 |
Note: | 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. |
HeBIS-PPN: | 513641734 |
Institutes: | Physik |
Wissenschaftliche Zentren und koordinierte Programme / Helmholtz International Center for FAIR | |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Sammlungen: | Universitätspublikationen |
Licence (German): | Creative Commons - CC BY - Namensnennung 4.0 International |