Charged pion production in $\mathbf{Au+Au}$ collisions at $\mathbf{\sqrt{s_{NN}}}$ = 2.4$\mathbf{GeV}$
Creators: name: Adamczewski-Musch, J.
name: Arnold, O.
name: Behnke, C.
name: Belounnas, A.
name: Belyaev, A.
name: Berger-Chen, J. C.
name: Biernat, J.
name: Blanco, A.
name: Blume, C.
name: Boehmer, M.
name: Bordalo, P.
name: Chernenko, S.
name: Chlad, L.
name: Ciepal, I.
name: Deveaux, C.
name: Dreyer, J.
name: Dybczak, A.
name: Epple, E.
name: Fabbietti, L.
name: Fateev, O.
name: Filip, P.
name: Fonte, P.
name: Franco, C.
name: Friese, J.
name: Froehlich, I.
name: Galatyuk, T.
name: Garzon, J. A.
name: Gernhaeuser, R.
name: Glaessel, S.
name: Golubeva, M.
name: Greifenhagen, R.
name: Guber, F.
name: Gumberidze, M.
name: Harabasz, S.
name: Heinz, T.
name: Hennino, T.
name: Hlavac, S.
name: Höhne, C.
name: Holzmann, R.
name: Ierusalimov, A.
name: Ivashkin, A.
name: Kämpfer, B.
name: Karavicheva, T.
name: Kardan, B.
name: Koenig, I.
name: Koenig, W.
name: Kohls, M.
name: Kolb, B. W.
name: Korcyl, G.
name: Kornakov, G.
name: Kornas, F.
name: Kotte, R.
name: Kugler, A.
name: Kunz, T.
name: Kurepin, A.
name: Kurilkin, A.
name: Kurilkin, P.
name: Ladygin, V.
name: Lalik, R.
name: Lapidus, K.
name: Lebedev, A.
name: Lopes, L.
name: Lorenz, M.
name: Mahmoud, T.
name: Maier, L.
name: Malige, A.
name: Mangiarotti, A.
name: Markert, J.
name: Matulewicz, T.
name: Maurus, S.
name: Metag, V.
name: Michel, J.
name: Mihaylov, D. M.
name: Morozov, S.
name: Muentz, C.
name: Muenzer, R.
name: Naumann, L.
name: Nowakowski, K.
name: Palka, M.
name: Parpottas, Y.
name: Pechenov, V.
name: Pechenova, O.
name: Petukhov, O.
name: Piasecki, K.
name: Pietraszko, J.
name: Przygoda, W.
name: Pysz, K.
name: Ramos, S.
name: Ramstein, B.
name: Reshetin, A.
name: Rodriguez-Ramos, P.
name: Rathod, N.
name: Rosier, P.
name: Rost, A.
name: Rustamov, A.
name: Sadovsky, A.
name: Salabura, P.
name: Scheib, T.
name: Schuldes, H.
name: Schwab, E.
name: Scozzi, F.
name: Seck, F.
name: Sellheim, P.
name: Selyuzhenkov, I.
name: Siebenson, J.
name: Silva, L.
name: Singh, U.
name: Smyrski, J.
name: Sobolev, Yu. G.
name: Spataro, S.
name: Spies, S.
name: Stroebele, H.
name: Stroth, J.
name: Strzempek, P.
name: Sturm, C.
name: Svoboda, O.
name: Szala, M.
name: Tlusty, P.
name: Traxler, M.
name: Tsertos, H.
name: Usenko, E.
name: Wagner, V.
name: Wendisch, C.
name: Wiebusch, M. G.
name: Wirth, J.
name: Wojcik, D.
name: Zanevsky, Y.
name: Zumbruch, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $2.5 σ$ 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.
description: 17 pages, 19 figures, 4 tables