THE pp -> pp pi(0)pi(0) REACTION AND ITS LIMITING CASE, FUSION TO QUASI-BOUND He-2, IN SEARCH OF THE ABC EFFECT

CELSIUS-WASA Collaboration, T. Skorodko*, M. Bashkanov, D. Bogoslowsky, H. Calen, H. Clement, E. Doroshkevich, C. Ekstrom, K. Fransson, L. Gustafsson, B. Hoistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, S. Keleta, O. Khakimova, I. Koch, F. Kren, S. KullanderA. Kupsc, A. Kuznetsov, P. Marciniewski, R. Meier, B. Morosov, C. Pauly, H. Petterson, Y. Petukhov, A. Povtorejko, A. Pricking, R. J. M. Y. Ruber, K. Schonning, W. Scobel, B. Shwartz, V. Sopov, J. Stepaniak, P. Thorngren-Engblom, V. Tikhomirov, A. Turowiecki, G. J. Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, J. Zlomanczuk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The pi(0)pi(0) production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to T-p = 1.4 GeV. For incident energies T-p > 1 GeV, i.e. in the region beyond the Roper excitation, the Delta Delta excitation process takes over. The data are well explained by the t-channel Delta Delta process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the pi(0)pi(0)-invariant mass distribution beyond that given by the conventional t-channel Delta Delta process. This is also true for the limiting case, where the protons are in the quasi-bound He-2 state.

Original languageEnglish
Pages (from-to)702-704
Number of pages3
JournalInternational Journal of Modern Physics A
Volume26
Issue number3-4
DOIs
Publication statusPublished - 10 Feb 2011
Event11th International Workshop on Meson Production, Properties and Interaction - Krakow, Poland
Duration: 10 Jun 201015 Jun 2010

Keywords / Materials (for Non-textual outputs)

  • Delta Delta excitation
  • t-channel Delta Delta process
  • quasibound He-2
  • ABC effect
  • PROTON-PROTON COLLISIONS
  • 2-PION PRODUCTION
  • PION PRODUCTION

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