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arXiv · 2005.08774

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

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
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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.

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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. 2020-05-18. Charged pion production in $\mathbf{Au+Au}$ collisions at $\mathbf{\sqrt{s_{NN}}}$ = 2.4$\mathbf{GeV}$. https://doi.org/10.1140/epja/s10050-020-00237-2

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