• Medientyp: E-Artikel
  • Titel: Search for η-mesic ^{4}He with the WASA-at-COSY detector
  • Beteiligte: Adlarson, P. [VerfasserIn]; Augustyniak, W. [VerfasserIn]; Clement, H. [VerfasserIn]; Wüstner, P. [VerfasserIn]; Wurm, P. [VerfasserIn]; Yamamoto, A. [VerfasserIn]; Yuan, X. [VerfasserIn]; Yurev, L. [VerfasserIn]; Zabierowski, J. [VerfasserIn]; Zheng, C. [VerfasserIn]; Zieliński, M. J. [VerfasserIn]; Zipper, W. [VerfasserIn]; Złomańczuk, J. [VerfasserIn]; Coderre, D. [VerfasserIn]; Żuprański, P. [VerfasserIn]; Żurek, M. [VerfasserIn]; Engels, Ralf W. [VerfasserIn]; Stroeher, Hans [VerfasserIn]; Czerwiński, E. [VerfasserIn]; Demmich, K. [VerfasserIn]; Doroshkevich, E. [VerfasserIn]; Erven, W. [VerfasserIn]; Eyrich, W. [VerfasserIn]; Fedorets, P. [VerfasserIn]; [...]
  • Erschienen: Inst., 2013
  • Erschienen in: Physical review / C 87(3), 035204 (2013). doi:10.1103/PhysRevC.87.035204
  • Sprache: Englisch
  • DOI: https://doi.org/10.1103/PhysRevC.87.035204
  • ISSN: 0556-2813; 1089-490X
  • Entstehung:
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  • Beschreibung: 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.
  • Zugangsstatus: Freier Zugang