$Σ^0$ production in proton nucleus collisions near threshold
Creators: name: Adamczewski-Musch, J.
name: Agakishiev, G.
name: Arnold, O.
name: Atomssa, E. T.
name: Behnke, C.
name: Berger-Chen, J. C.
name: Biernat, J.
name: Blanco, A.
name: Blume, C.
name: Böhmer, M.
name: Chernenko, P. Bordalo S.
name: Deveaux, C.
name: Dybczak, A.
name: Epple, E.
name: Fabbietti, L.
name: Fonte, O. Fateev P.
name: Franco, C.
name: Friese, J.
name: Fröhlich, I.
name: Galatyuk, T.
name: Garzón, J. A.
name: Gernhäuser, R.
name: Gill, K.
name: Golubeva, M.
name: Guber, F.
name: Gumberidze, M.
name: Harabasz, S.
name: Hlavac, T. Hennino S.
name: Höhne, C.
name: Holzmann, R.
name: Ierusalimov, A.
name: Ivashkin, A.
name: Kämpfer, M. Jurkovic B.
name: Karavicheva, T.
name: Kardan, B.
name: Koenig, I.
name: Koenig, W.
name: Kolb, B. W.
name: Korcyl, G.
name: Kornakov, G.
name: Kotte, R.
name: Krása, A.
name: Krebs, E.
name: Kuc, H.
name: Kunz, A. Kugler 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: Maurus, S.
name: Mangiarotti, A.
name: Markert, J.
name: Metag, V.
name: Michel, J.
name: Müntz, C.
name: Naumann, R. Münzer L.
name: Palka, M.
name: Parpottas, Y.
name: Pechenov, V.
name: Pechenova, O.
name: Petousis, V.
name: Pietraszko, J.
name: Przygoda, W.
name: Ramos, S.
name: Ramstein, B.
name: Rehnisch, L.
name: Reshetin, A.
name: Rost, A.
name: Rustamov, A.
name: Sadovsky, A.
name: Salabura, P.
name: Scheib, T.
name: Schmidt-Sommerfeld, K.
name: Schuldes, H.
name: Sellheim, P.
name: Siebenson, J.
name: Silva, L.
name: Sobolev, Yu. G.
name: Spataro, S.
name: Ströbele, H.
name: Stroth, J.
name: Strzempek, P.
name: Sturm, C.
name: Svoboda, O.
name: Tarantola, A.
name: Teilab, K.
name: Tlusty, P.
name: Traxler, M.
name: Tsertos, H.
name: Vasiliev, T.
name: Wagner, V.
name: Wendisch, C.
name: Wirth, J.
name: Wüstenfeld, J.
name: Zanevsky, Y.
name: Zumbruch, P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The production of $Σ^{0}$ baryons in the nuclear reaction p (3.5 GeV) + Nb (corresponding to $\sqrt{s_{NN}}=3.18$ GeV) is studied with the detector set-up HADES at GSI, Darmstadt. $Σ^{0}$s were identified via the decay $Σ^{0} \rightarrow Λγ$ with subsequent decays $Λ\rightarrow p π^{-}$ in coincidence with a $e^{+}e^{-}$ pair from either external ($γ\rightarrow e^{+} e^{-}$) or internal (Dalitz decay $γ^{*}\rightarrow e^{+} e^{-}$) gamma conversions. The differential $Σ^0$ cross section integrated over the detector acceptance, i.e. the rapidity interval $0.5 &lt; y &lt; 1.1$, has been extracted as $Δσ_{Σ^{0}} = 2.3 \pm (0.2)^{stat} \pm \left(^{+0.6}_{-0.6}\right)^{sys} \pm (0.2)^{norm}$ mb, yielding the inclusive production cross section in full phase space $σ^{total}_{Σ^{0}} = 5.8 \pm (0.5)^{stat} \pm \left(^{+1.4}_{-1.4}\right)^{sys} \pm (0.6)^{norm} \pm (1.7)^{extrapol}$ mb by averaging over different extrapolation methods. The $Λ_{all}$/$Σ^{0}$ ratio within the HADES acceptance is equal to 2.3 $\pm$ $(0.2)^{stat}$ $\pm$ $(^{+0.6}_{-0.6})^{sys}$. The obtained rapidity and momentum distributions are compared to transport model calculations. The $Σ^{0}$ yield agrees with the statistical model of particle production in nuclear reactions.
description: 7 pages, 5 figures