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Nuclear Experiment

arXiv:2005.08774 (nucl-ex)
[Submitted on 18 May 2020 (v1), last revised 19 May 2020 (this version, v2)]

Title:Charged pion production in $\mathbf{Au+Au}$ collisions at $\mathbf{\sqrt{s_{NN}}}$ = 2.4$\mathbf{GeV}$

Authors:J.Adamczewski-Musch, O.Arnold, C.Behnke, A.Belounnas, A.Belyaev, J.C.Berger-Chen, J.Biernat, A.Blanco, C.Blume, M.Boehmer, P.Bordalo, S.Chernenko, L.Chlad, I.Ciepal, C.Deveaux, J.Dreyer, A.Dybczak, E.Epple, L.Fabbietti, O.Fateev, P.Filip, P.Fonte, C.Franco, J.Friese, I.Froehlich, T.Galatyuk, J.A.Garzon, R.Gernhaeuser, S.Glaessel, M.Golubeva, R.Greifenhagen, F.Guber, M.Gumberidze, S.Harabasz, T.Heinz, T.Hennino, S.Hlavac, C.Höhne, R.Holzmann, A.Ierusalimov, A.Ivashkin, B.Kämpfer, T.Karavicheva, B.Kardan, I.Koenig, W.Koenig, M.Kohls, B.W.Kolb, G.Korcyl, G.Kornakov, F.Kornas, R.Kotte, A.Kugler, T.Kunz, A.Kurepin, A.Kurilkin, P.Kurilkin, V.Ladygin, R.Lalik, K.Lapidus, A.Lebedev, L.Lopes, M.Lorenz, T.Mahmoud, L.Maier, A.Malige, A.Mangiarotti, J.Markert, T.Matulewicz, S.Maurus, V.Metag, J.Michel, D.M.Mihaylov, S.Morozov, C.Muentz, R.Muenzer, L.Naumann, K.Nowakowski, M.Palka, Y.Parpottas, V.Pechenov, O.Pechenova, O.Petukhov, K.Piasecki, J.Pietraszko, W.Przygoda, K.Pysz, S.Ramos, B.Ramstein, A.Reshetin, P.Rodriguez-Ramos, N.Rathod, P.Rosier, A.Rost, A.Rustamov, A.Sadovsky, P.Salabura, T.Scheib, H.Schuldes, E.Schwab et al. (28 additional authors not shown)  You must enable JavaScript to view entire author list.
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Abstract:We present high-statistic data on charged pion emission from Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 2.4 GeV (corresponding to $E_{beam}$ = 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 world data, but undershoot by $2.5 \sigma$ 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.
Comments: 17 pages, 19 figures, 4 tables
Subjects: Nuclear Experiment (nucl-ex)
Cite as: arXiv:2005.08774 [nucl-ex]
  (or arXiv:2005.08774v2 [nucl-ex] for this version)
  https://doi.org/10.48550/arXiv.2005.08774
Related DOI: https://doi.org/10.1140/epja/s10050-020-00237-2

Submission history

From: Malgorzata Gumberidze Dr. [view email]
[v1] Mon, 18 May 2020 14:42:44 UTC (2,337 KB)
[v2] Tue, 19 May 2020 15:43:46 UTC (2,337 KB)
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