Search for η-mesic ^{4}He with the WASA-at-COSY detector

Adlarson, P.; Yuan, X.; Grigoryev, K.; Clement, H.; Kistryn, S.; Augustyniak, W.; Złomańczuk, J.; Skorodko, T.; Serdyuk, V.; Calén, H.; Doroshkevich, E.; Wurm, P.; Höistad, B.; Schmidt, A.; Hejny, V.; Berłowski, M.; Stassen, R.; Zieliński, M. J.; Hinterberger, F.; Mariański, B.; Tolba, T.; Kłos, B.; Varma, R.; Siudak, R.; Kemmerling, G.; Khan, F. A.; Pysz, K.; Jany, B. R.; Erven, W.; Zipper, W.; Pluciński, P.; Mikirtychiants, M.; Lorentz, B.; Goldenbaum, F.; Goslawski, P.; Krzemień, W.; Engels, Ralf W.; Klaja, J.; Wagner, G. J.; Magiera, A.; Pyszniak, A.; Föhl, K.; Zheng, C.; Czerwiński, E.; Eyrich, W.; Fedorets, P.; Hodana, M.; Yamamoto, A.; Wrońska, A.; Krapp, M.; Nandi, B. K.; Jany, A.; Węglorz, W.; Niedźwiecki, S.; Moskal, P.; Pricking, A.; Jarczyk, L.; Bergmann, F. S.; Ohm, H.; Kamys, B.; Sterzenbach, G.; Demmich, K.; Stephan, E.; Bardan, W.; Johansson, T.; Ritman, J.; Sawant, S.; Maier, R.; Stockhorst, H.; Coderre, D.; Büscher, M.; Shah, N.; Bashkanov, M.; Goswami, A.; Morsch, H. –P.; Sopov, V.; Lersch, D.; Bhatt, H.; Rudy, Z.; Fransson, K.; Podkopał, P.; Kupść, A.; Żuprański, P.; Kleines, H.; Smyrski, J.; Prasuhn, D.; Perez del Rio, E.; Skurzok, M.; Ozerianska, I.; Żurek, M.; Vlasov, P.; Khoukaz, A.; Szczurek, A.; Trzciński, A.; Pszczel, D.; Stroeher, Hans; Stepaniak, J.; Schadmand, S.; Kulessa, P.; Wüstner, P.; Lalwani, K.; Sefzick, T.; Li, L.; Yurev, L.; Heijkenskjöld, L.; Bednarski, T.; Gullström, C. –O.; Zabierowski, J.; Roy, A.; Siemaszko, M.; Wolke, M.; Marciniewski, P.; Redmer, C. F.; Hauenstein, F.

doi:10.1103/PhysRevC.87.035204

Journal Article

FZJ-2013-04276

Search for η-mesic ^{4}He with the WASA-at-COSY detector

Adlarson, P. (Corresponding author) ; Augustyniak, W. ; Bardan, W. ; Bashkanov, M. ; Bednarski, T. ; Bergmann, F. S. ; Berłowski, M. ; Bhatt, H.FZJ* ; Büscher, M.FZJ* ; Calén, H.FZJ* ; Clement, H. ; Coderre, D.FZJ* ; Czerwiński, E. ; Demmich, K. ; Doroshkevich, E. ; Erven, W.ZEA-2*FZJ* ; Eyrich, W. ; Fedorets, P.FZJ* ; Föhl, K. ; Fransson, K. ; Goldenbaum, F.FZJ* ; Goslawski, P. ; Goswami, A.FZJ* ; Grigoryev, K.FZJ* ; Gullström, C. –. ; Hauenstein, F.FZJ* ; Heijkenskjöld, L. ; Hejny, V.FZJ* ; Hinterberger, F. ; Hodana, M.FZJ* ; Höistad, B. ; Jany, A. ; Jany, B. R. ; Jarczyk, L. ; Johansson, T. ; Kamys, B. ; Kemmerling, G.ZEA-2*FZJ* ; Khan, F. A.FZJ* ; Khoukaz, A. ; Kistryn, S. ; Klaja, J. ; Kleines, H.ZEA-2*FZJ* ; Kłos, B. ; Krapp, M. ; Krzemień, W. ; Kulessa, P.FZJ* ; Kupść, A.FZJ* ; Lalwani, K. ; Lersch, D.FZJ* ; Li, L. ; Lorentz, B.FZJ* ; Magiera, A. ; Maier, R.FZJ* ; Marciniewski, P. ; Mariański, B. ; Mikirtychiants, M.FZJ* ; Morsch, H. –. ; Moskal, P.FZJ* ; Nandi, B. K. ; Niedźwiecki, S. ; Ohm, H.FZJ* ; Ozerianska, I. ; Perez del Rio, E. ; Pluciński, P. ; Podkopał, P. ; Prasuhn, D.FZJ* ; Pricking, A. ; Pszczel, D. ; Pysz, K. ; Pyszniak, A. ; Redmer, C. F. ; Ritman, J.FZJ* ; Roy, A. ; Rudy, Z. ; Sawant, S. ; Schadmand, S.FZJ* ; Schmidt, A.FZJ* ; Sefzick, T.FZJ* ; Serdyuk, V.FZJ* ; Shah, N. ; Siemaszko, M. ; Siudak, R. ; Skorodko, T. ; Skurzok, M. ; Smyrski, J. ; Sopov, V. ; Stassen, R.FZJ* ; Stepaniak, J. ; Stephan, E. ; Sterzenbach, G.FZJ* ; Stockhorst, H.FZJ* ; Szczurek, A. ; Tolba, T. ; Trzciński, A. ; Varma, R. ; Vlasov, P. ; Wagner, G. J. ; Węglorz, W. ; Wolke, M.FZJ* ; Wrońska, A. ; Wüstner, P.ZEA-2*FZJ* ; Wurm, P.FZJ* ; Yamamoto, A. ; Yuan, X. ; Yurev, L.FZJ* ; Zabierowski, J. ; Zheng, C. ; Zieliński, M. J. ; Zipper, W. ; Złomańczuk, J. ; Żuprański, P. ; Żurek, M.FZJ* ; Engels, R. W.FZJ* ; Stroeher, H.FZJ*

2013
Inst. Woodbury, NY

Physical review / C 87(3), 035204 (2013) [10.1103/PhysRevC.87.035204]

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Please use a persistent id in citations: http://hdl.handle.net/2128/5396 doi:10.1103/PhysRevC.87.035204

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

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