Charged-pion production in Au+Au collisions at sNN=2.4GeV

We present high-statistic data on charged-pion emission from Au + Au collisions at s 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, rapidit...

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Veröffentlicht in:	The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2020, Vol.56 (10)
Hauptverfasser:	Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J. C., Blanco, A., Blume, C., Bordalo, P., Chernenko, S., Chlad, L., Ciepał, I., Deveaux, C., Dreyer, J., Epple, E., Fabbietti, L., Fateev, O., Fonte, P., Franco, C., Fröhlich, I., Galatyuk, T., Gernhäuser, R., Gläßel, S., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, W., Kohls, M., Kolb, B. W., Korcyl, G., Kornas, F., Kotte, R., Kugler, A., Ladygin, V., Lopes, L., Lorenz, M., Mahmoud, T., Maier, L., Malige, A., Mangiarotti, A., Markert, J., Matulewicz, T., Michel, J., Mihaylov, D. M., Morozov, S., Müntz, C., Münzer, R., Naumann, L., Nowakowski, K., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Piasecki, K., Pietraszko, J., Przygoda, W., Pysz, K., Ramstein, B., Rathod, N., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Rustamov, A., Sadovsky, A., Salabura, P., Schuldes, H., Schwab, E., Scozzi, F., Seck, F., Sellheim, P., Selyuzhenkov, I., Siebenson, J., Silva, L., Singh, U., Smyrski, J., Spies, S., Ströbele, H., Stroth, J., Sturm, C., Svoboda, O., Szala, M., Traxler, M., Tsertos, H., Wagner, V., Wendisch, C., Wirth, J., Wójcik, D., Zanevsky, Y., Zumbruch, P.
Format:	Artikel
Sprache:	eng
Schlagworte:	Collisions Hadrons Heavy Ions Nuclear Fusion Nuclear Physics Particle and Nuclear Physics Physics Physics and Astronomy Pions Regular Article – Experimental Physics Transverse momentum
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Zusammenfassung:	We present high-statistic data on charged-pion emission from Au + Au collisions at s 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 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.
ISSN:	1434-6001 1434-601X
DOI:	10.1140/epja/s10050-020-00237-2