/ nucl-ex arXiv:1711.05559


$\Sigma^0$ production in proton nucleus collisions near threshold


Adamczewski-Musch, J. (Darmstadt, GSI) ; Agakishiev, G. (Dubna, JINR) ; Arnold, O. (Munich, Tech. U.) ; Atomssa, E.T. (Orsay, IPN) ; Behnke, C. (Frankfurt U., Inst. Kernphys.) ; Berger-Chen, J.C. (Munich, Tech. U.) ; Biernat, J. (Jagiellonian U.) ; Blanco, A. (LIP, Coimbra) ; Blume, C. (Frankfurt U., Inst. Kernphys.) ; Böhmer, M. (Munich, Tech. U.) ; Bordalo, P. (LIP, Coimbra) ; Chernenko, S. (Dubna, JINR) ; Deveaux, C. (Giessen U.) ; Dybczak, A. (Jagiellonian U.) ; Epple, E. (Munich, Tech. U.) ; Fabbietti, L. (Munich, Tech. U.) ; Fateev, O. (Dubna, JINR) ; Fonte, P. (Coimbra Inst. Sup. Eng.) ; Franco, C. (LIP, Coimbra) ; Friese, J. (Munich, Tech. U.) ; Fröhlich, I. (Frankfurt U., Inst. Kernphys.) ; Galatyuk, T. (Darmstadt, EMMI) ; Garzón, J.A. (Santiago de Compostela U.) ; Gernhäuser, R. (Munich, Tech. U.) ; Gill, K. (Frankfurt U., Inst. Kernphys.) ; Golubeva, M. (Moscow, INR) ; Guber, F. (Moscow, INR) ; Gumberidze, M. (Darmstadt, EMMI) ; Harabasz, S. (Darmstadt, Tech. U.) ; Hennino, T. (Orsay, IPN) ; Hlavac, S. (Bratislava, Inst. Phys.) ; Höhne, C. (Giessen U.) ; Holzmann, R. (Darmstadt, GSI) ; Ierusalimov, A. (Dubna, JINR) ; Ivashkin, A. (Moscow, INR) ; Jurkovic, M. (Munich, Tech. U.) ; Kämpfer, B. (Dresden, Tech. U.) ; Karavicheva, T. (Moscow, INR) ; Kardan, B. (Frankfurt U., Inst. Kernphys.) ; Koenig, I. (Darmstadt, GSI) ; Koenig, W. (Darmstadt, GSI) ; Kolb, B.W. (Darmstadt, GSI) ; Korcyl, G. (Jagiellonian U.) ; Kornakov, G. (Darmstadt, Tech. U.) ; Kotte, R. (HZDR, Dresden) ; Krása, A. (Rez, Nucl. Phys. Inst.) ; Krebs, E. (Frankfurt U., Inst. Kernphys.) ; Kuc, H. (Orsay, IPN) ; Kugler, A. (Rez, Nucl. Phys. Inst.) ; Kunz, T. (Munich, Tech. U.) ; Kurepin, A. (Moscow, INR) ; Kurilkin, A. (Dubna, JINR) ; Kurilkin, P. (Dubna, JINR) ; Ladygin, V. (Dubna, JINR) ; Lalik, R. (Munich, Tech. U.) ; Lapidus, K. (Munich, Tech. U.) ; Lebedev, A. (Moscow, ITEP) ; Lopes, L. (LIP, Coimbra) ; Lorenz, M. (Frankfurt U., Inst. Kernphys.) ; Mahmoud, T. (Giessen U.) ; Maier, L. (Munich, Tech. U.) ; Maurus, S. (Munich, Tech. U.) ; Mangiarotti, A. (LIP, Coimbra) ; Markert, J. (Frankfurt U., Inst. Kernphys.) ; Metag, V. (Giessen U.) ; Michel, J. (Frankfurt U., Inst. Kernphys.) ; Müntz, C. (Frankfurt U., Inst. Kernphys.) ; Münzer, R. (Munich, Tech. U.) ; Naumann, L. (HZDR, Dresden) ; Palka, M. (Jagiellonian U.) ; Parpottas, Y. (Frederick Inst. Tech.) ; Pechenov, V. (Darmstadt, GSI) ; Pechenova, O. (Frankfurt U., Inst. Kernphys.) ; Petousis, V. (Cyprus U.) ; Pietraszko, J. (Darmstadt, GSI) ; Przygoda, W. (Jagiellonian U.) ; Ramos, S. (LIP, Coimbra) ; Ramstein, B. (Orsay, IPN) ; Rehnisch, L. (Frankfurt U., Inst. Kernphys.) ; Reshetin, A. (Moscow, INR) ; Rost, A. (Darmstadt, Tech. U.) ; Rustamov, A. (Frankfurt U., Inst. Kernphys.) ; Sadovsky, A. (Moscow, INR) ; Salabura, P. (Jagiellonian U.) ; Scheib, T. (Frankfurt U., Inst. Kernphys.) ; Schmidt-Sommerfeld, K. (Munich, Tech. U.) ; Schuldes, H. (Frankfurt U., Inst. Kernphys.) ; Sellheim, P. (Frankfurt U., Inst. Kernphys.) ; Siebenson, J. (Munich, Tech. U.) ; Silva, L. (LIP, Coimbra) ; Sobolev, Yu.G. (Rez, Nucl. Phys. Inst.) ; Spataro, S. (Turin U.) ; Ströbele, H. (Frankfurt U., Inst. Kernphys.) ; Stroth, J. (Darmstadt, GSI) ; Strzempek, P. (Jagiellonian U.) ; Sturm, C. (Darmstadt, GSI) ; Svoboda, O. (Rez, Nucl. Phys. Inst.) ; Tarantola, A. (Frankfurt U., Inst. Kernphys.) ; Teilab, K. (Frankfurt U., Inst. Kernphys.) ; Tlusty, P. (Rez, Nucl. Phys. Inst.) ; Traxler, M. (Darmstadt, GSI) ; Tsertos, H. (Cyprus U.) ; Vasiliev, T. (Dubna, JINR) ; Wagner, V. (Rez, Nucl. Phys. Inst.) ; Wendisch, C. (Darmstadt, GSI) ; Wirth, J. (Munich, Tech. U.) ; Wüstenfeld, J. (HZDR, Dresden) ; Zanevsky, Y. (Dubna, JINR) ; Zumbruch, P. (Darmstadt, GSI)

Pages: 7

Abstract: The production of $\Sigma^{0}$ 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. $\Sigma^{0}$s were identified via the decay $\Sigma^{0} \rightarrow \Lambda \gamma$ with subsequent decays $\Lambda \rightarrow p \pi^{-}$ in coincidence with a $e^{+}e^{-}$ pair from either external ($\gamma \rightarrow e^{+} e^{-}$) or internal (Dalitz decay $\gamma^{*}\rightarrow e^{+} e^{-}$) gamma conversions. The differential $\Sigma^0$ cross section integrated over the detector acceptance, i.e. the rapidity interval $0.5 < y < 1.1$, has been extracted as $\Delta\sigma_{\Sigma^{0}} = 2.3 \pm (0.2)^{stat} \pm \left(^{+0.6}_{-0.6}\right)^{sys} \pm (0.2)^{norm}$ mb, yielding the inclusive production cross section in full phase space $\sigma^{total}_{\Sigma^{0}} = 5.8 \pm (0.5)^{stat} \pm \left(^{+1.4}_{-1.4}\right)^{sys} \pm (0.6)^{norm} \pm (1.7)^{extrapol}$ mb by averaging over different extrapolation methods. The $\Lambda_{all}$/$\Sigma^{0}$ 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 $\Sigma^{0}$ yield agrees with the statistical model of particle production in nuclear reactions.

Web-Page: http://inspirehep.net/record/1636282/files/THERMUS.png; http://inspirehep.net/record/1636282/files/WORLD.png; http://inspirehep.net/record/1636282/files/MTM0_layout.png; http://inspirehep.net/record/1636282/files/LAMBDA_COINC_PAPER_INLAY.png; http://inspirehep.net/record/1636282/files/COMBINED.png; http://inspirehep.net/record/1636282/files/arXiv:1711.05559.pdf


Note: 7 pages, 5 figures

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