Σ0-production in proton nucleus collisions near threshold

Σ0-production in proton nucleus collisions near threshold

Adamczewski-Musch, J.; Agakishiev, G.; Arnold, O.; Atomssa, E. T.; Behnke, C.; Berger-Chen, J. C.; Biernat, J.; Blanco, A.; Blume, C.; Böhmer, M.; Bordalo, P.; Chernenko, S.; Deveaux, C.; Dybczak, A.; Epple, E.; Fabbietti, L.; Fateev, O.; Fonte, P.; Franco, C.; Friese, J.; Fröhlich, I.; Galatyuk, T.; Garzon, J. A.; Gill, K.; Golubeva, M.; Guber, F.; Gumberidze, M.; Harabasz, S.; Hennino, T.; Hlavac, S.; Höhne, C.; Holzmann, R.; Ierusalimov, A.; Ivashkin, A.; Jurkovic, M.; Kämpfer, B.; Karavicheva, T.; Kardan, B.; Koenig, I.; Koenig, W.; Kolb, B. W.; Korcyl, G.; Kornakov, G.; Kotte, R.; Krasa, A.; Krebs, E.; Kuc, H.; Kugler, A.; Kunz, T.; Kurepin, A.; Kurilkin, A.; Kurilkin, P.; Ladygin, V.; Lalik, R.; Lapidus, K.; Lebedev, A.; Lopes, L.; Lorenz, M.; Mahmoud, T.; Maier, L.; Maurus, S.; Mangiarotti, A.; Markert, J.; Metag, V.; Michel, J.; Müntz, C.; Münzer, R.; Naumann, L.; Palka, M.; Parpottas, Y.; Pechenov, V.; Pechenova, O.; Petousis, V.; Pietraszko, J.; Przygoda, W.; Ramstein, B.; Rehnisch, L.; Reshetin, A.; Rost, A.; Rustamov, A.; Sadovsky, A.; Salabura, P.; Scheib, T.; Schmidt-Sommerfeld, K.; Schuldes, H.; Sellheim, P.; Siebenson, J.; Silva, L.; Sobolev, Y. G.; Spataro, S.; Ströbele, H.; Stroth, J.; Strzempek, P.; Sturm, C.; Svoboda, O.; Tarantola, A.; Teilab, K.; Tlusty, P.; Traxler, M.; Tsertos, H.; Vasiliev, T.; Wagner, V.; Wendisch, C.; Wirth, J.; Wüstenfeld, J.; Zanevsky, Y.; Zumbruch, P.

Abstract

We have studied the production of Σ0 baryons in the nuclear reaction p (3.5 GeV) + Nb. The measurement has been performed with the HADES detector at GSI, Darmstadt. Σ0->Λγ decays were identified via the decay Λ->pπ- coincident to e+e- pairs from external and internal (Dalitz decay) gamma conversion. The differential cross section integrated over the detector acceptance, i.e. within the rapidity interval 0.5 < y < 1.1, has been extracted to be 2.3 +- 0.2 (stat) +- 0.6 (sys) +- 0.2 (norm) mb and the total cross section is obtained by using different extrapolation methods to 5.8 +- 0.5 (stat) +- 1.4 (sys) +- 0.6 (norm) +- 1.7 (extrapol) mb. The Λ/Σ0 ratio is estimated for the full phase space to be 2.6 +- 0.2 (stat) +- 0.8 (sys) +- 0.7 (extrapol). The obtained rapidity and momentum distributions are compared to predictions from transport model calculations. The Σ0 cross section is discussed in the context of statistical particle production in nuclear reactions.

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