/ Experiment-Nucl arXiv:1301.0843


Search for the eta-mesic 4He with WASA-at-COSY detector


Adlarson, P. (Uppsala U.) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Bardan, W. (Jagiellonian U.) ; Bashkanov, M. (Tubingen U.) ; Bednarski, T. (Jagiellonian U.) ; Bergmann, F.S. (Munster U.) ; Berlowski, M. (Warsaw, Inst. Nucl. Studies) ; Bhatt, H. (Indian Inst. Tech., Mumbai) ; Buscher, M. (Julich, Forschungszentrum) ; Calen, H. (Uppsala U.) ; Clement, H. (Tubingen U.) ; Coderre, D. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Czerwinski, E. (Jagiellonian U.) ; Demmich, K. (Munster U.) ; Doroshkevich, E. (Tubingen U.) ; Engels, R. (Julich, Forschungszentrum) ; Erven, W. (Julich, Forschungszentrum) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Fedorets, P. (Moscow, ITEP) ; Fohl, K. (Giessen U.) ; Fransson, K. (Uppsala U.) ; Goldenbaum, F. (Julich, Forschungszentrum) ; Goslawski, P. (Munster U.) ; Goswami, A. (Indian Inst. Tech., Indore) ; Grigoryev, K. (St. Petersburg, INP) ; Gullstrom, C.O. (Uppsala U.) ; Hauenstein, F. (Erlangen - Nuremberg U.) ; Heijkenskjold, L. (Uppsala U.) ; Hejny, V. (Julich, Forschungszentrum) ; Hinterberger, F. (Bonn U. Observ.) ; Hodana, M. (Julich, Forschungszentrum) ; Hoistad, B. (Uppsala U.) ; Jany, A. (Jagiellonian U.) ; Jany, B.R. (Jagiellonian U.) ; Jarczyk, L. (Jagiellonian U.) ; Johansson, T. (Uppsala U.) ; Kamys, B. (Jagiellonian U.) ; Kemmerling, G. (Julich, Forschungszentrum) ; Khan, F.A. (Julich, Forschungszentrum) ; Khoukaz, A. (Munster U.) ; Kistryn, S. (Jagiellonian U.) ; Klaja, J. (Jagiellonian U.) ; Kleines, H. (Julich, Forschungszentrum) ; Klos, B. (Silesia U.) ; Krapp, M. (Erlangen - Nuremberg U.) ; Krzemien, W. (Jagiellonian U.) ; Kulessa, P. (Cracow, INP) ; Kupsc, A. (Warsaw, Inst. Nucl. Studies) ; Lalwani, K. (Indian Inst. Tech., Mumbai) ; Lersch, D. (Julich, Forschungszentrum) ; Li, L. (Erlangen - Nuremberg U.) ; Lorentz, B. (Julich, Forschungszentrum) ; Magiera, A. (Jagiellonian U.) ; Maier, R. (Julich, Forschungszentrum) ; Marciniewski, P. (Uppsala U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Mikirtychiants, M. (St. Petersburg, INP) ; Morsch, H.P. (Warsaw, Inst. Nucl. Studies) ; Moskal, P. (Jagiellonian U.) ; Nandi, B.K. (Indian Inst. Tech., Mumbai) ; Niedzwiecki, S. (Jagiellonian U.) ; Ohm, H. (Julich, Forschungszentrum) ; Ozerianska, I. (Jagiellonian U.) ; Perez del Rio, E. (Tubingen U.) ; Plucinski, P. (Uppsala U.) ; Podkopal, P. (Julich, Forschungszentrum) ; Prasuhn, D. (Julich, Forschungszentrum) ; Pricking, A. (Tubingen U.) ; Pszczel, D. (Warsaw, Inst. Nucl. Studies) ; Pysz, K. (Cracow, INP) ; Pyszniak, A. (Jagiellonian U.) ; Redmer, C.F. (Uppsala U.) ; Ritman, J. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Roy, A. (Indian Inst. Tech., Indore) ; Rudy, Z. (Jagiellonian U.) ; Sawant, S. (Indian Inst. Tech., Mumbai) ; Schadmand, S. (Julich, Forschungszentrum) ; Schmidt, A. (Erlangen - Nuremberg U.) ; Sefzick, T. (Julich, Forschungszentrum) ; Serdyuk, V. (Dubna, JINR) ; Shah, N. (Indian Inst. Tech., Mumbai) ; Siemaszko, M. (Silesia U.) ; Siudak, R. (Cracow, INP) ; Skorodko, T. (Tubingen U.) ; Skurzok, M. (Jagiellonian U.) ; Smyrski, J. (Jagiellonian U.) ; Sopov, V. (Moscow, ITEP) ; Stassen, R. (Julich, Forschungszentrum) ; Stepaniak, J. (Warsaw, Inst. Nucl. Studies) ; Stephan, E. (Silesia U.) ; Sterzenbach, G. (Julich, Forschungszentrum) ; Stockhorst, H. (Julich, Forschungszentrum) ; Stroher, H. (Julich, Forschungszentrum) ; Szczurek, A. (Cracow, INP) ; Tolba, T. (Julich, Forschungszentrum) ; Trzcinski, A. (Warsaw, Inst. Nucl. Studies) ; Varma, R. (Indian Inst. Tech., Mumbai) ; Vlasov, P. (Bonn U. Observ.) ; Wagner, G.J. (Tubingen U.) ; e, W.W\k (Silesia U.) ; Wolke, M. (Uppsala U.) ; Wronska, A. (Jagiellonian U.) ; Wustner, P. (Julich, Forschungszentrum) ; Wurm, P. (Julich, Forschungszentrum) ; Yamamoto, A. (KEK, Tsukuba) ; Yuan, X. (Lanzhou, Inst. Modern Phys.) ; Yurev, L. (Dubna, JINR) ; Zabierowski, J. (Lodz, Cosmic Ray) ; Zheng, C. (Lanzhou, Inst. Modern Phys.) ; Zielinski, M.J. (Jagiellonian U.) ; Zipper, W. (Silesia U.) ; Zlomanczuk, J. (Uppsala U.) ; Z, P. (Warsaw, Inst. Nucl. Studies) ; Z, M. (Jagiellonian U.)

Pages: 8

Abstract: An exclusive measurement of the excitation function for the dd->3Heppi- reaction was performed at the Cooler Synchrotron COSY-Juelich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 GeV/c to 2.400 GeV/c crossing the kinematic threshold for the eta meson production in the dd->4He-eta reaction at 2.336 GeV/c. The corresponding excess energy with respect to the 4He-eta system varied from -51.4MeV to 22MeV. The integrated luminosity in the experiment was determined using the dd->3Hen reaction. The shape of the excitation function for the dd->3Heppi- was examined. No signal of the 4He-eta bound state was observed. An upper limit for the cross-section for the bound state formation and decay in the process dd->(4He-eta)bound->3Heppi- was determined on the 90% confidence level and it varies from 20nb to 27nb for the bound state width ranging from 5MeV to 35MeV, respectively.

Web-Page: http://inspirehep.net/record/1209601/files/arXiv:1301.0843.pdf; http://inspirehep.net/record/1209601/files/Pictures_figure1.png; http://inspirehep.net/record/1209601/files/Pictures_figure3a.png; http://inspirehep.net/record/1209601/files/Pictures_figure3b.png; http://inspirehep.net/record/1209601/files/Pictures_figure4a.png; http://inspirehep.net/record/1209601/files/Pictures_figure4b.png; http://inspirehep.net/record/1209601/files/Pictures_figure4c.png; http://inspirehep.net/record/1209601/files/Pictures_figure5a.png; http://inspirehep.net/record/1209601/files/Pictures_figure5b.png; http://inspirehep.net/record/1209601/files/Pictures_figure7.png; http://inspirehep.net/record/1209601/files/Pictures_figure8.png; http://inspirehep.net/record/1209601/files/Pictures_figure9.png; http://inspirehep.net/record/1209601/files/figure1.png; http://inspirehep.net/record/1209601/files/figure3a.png; http://inspirehep.net/record/1209601/files/figure3b.png; http://inspirehep.net/record/1209601/files/figure4a.png; http://inspirehep.net/record/1209601/files/figure4b.png; http://inspirehep.net/record/1209601/files/figure4c.png; http://inspirehep.net/record/1209601/files/figure5a.png; http://inspirehep.net/record/1209601/files/figure5b.png; http://inspirehep.net/record/1209601/files/figure7.png; http://inspirehep.net/record/1209601/files/figure8.png; http://inspirehep.net/record/1209601/files/figure9.png


Note: 8 pages, 9 figures

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