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27 April 2024

» arxiv » 2005.8774

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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 ; F.Scozzi ; F.Seck ; P.Sellheim ; I.Selyuzhenkov ; J.Siebenson ; L.Silva ; U.Singh ; J.Smyrski ; Yu.G.Sobolev ; S.Spataro ; S.Spies ; H.Stroebele ; J.Stroth ; P.Strzempek ; C.Sturm ; O.Svoboda ; M.Szala ; P.Tlusty ; M.Traxler ; H.Tsertos ; E.Usenko ; V.Wagner ; C.Wendisch ; M.G.Wiebusch ; J.Wirth ; D.Wojcik ; Y.Zanevsky ; P.Zumbruch ;
Date:	18 May 2020
Abstract:	We present high-statistic data on charged pion emission from Au+Au collisions at $sqrt{s_{ m{NN}}}$ = 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.
Source:	arXiv, 2005.8774
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