Charged-pion production in Au +Au collisions at √{sNN}=2.4 GeV
Abstract
We present high-statistic data on charged-pion emission from Au + Au collisions at √{sNN}=2.4 GeV (corresponding to Ebeam=1.23 A GeV ) in four centrality classes in the range 0-40% of the most central collisions. The data are analyzed as a function of transverse momentum, transverse mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. The polar angular distributions are found to be non-isotropic even for the most central event class. Our results on pion multiplicity fit well into the general trend of the available world data, but undershoot by 2.5 σ data from the FOPI experiment measured at slightly lower beam energy. We compare our data to state-of-the-art transport model calculations (PHSD, IQMD, PHQMD, GiBUU and SMASH) and find substantial differences between the measurement and the results of these calculations.
- Publication:
-
European Physical Journal A
- Pub Date:
- October 2020
- DOI:
- 10.1140/epja/s10050-020-00237-2
- arXiv:
- arXiv:2005.08774
- Bibcode:
- 2020EPJA...56..259A
- Keywords:
-
- Nuclear Experiment
- E-Print:
- 17 pages, 19 figures, 4 tables