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The pp → ppπ0π0 reaction and its limiting case, fusion to quasi-bound 2He, in search of the ABC effect

Research output: Contribution to journalArticlepeer-review

Published copy (DOI)


  • T. Skorodko
  • D. Bogoslowsky
  • H. Calén
  • H. Clement
  • E. Doroshkevich
  • C. Ekström
  • K. Fransson
  • L. Gustafsson
  • B. Höistad
  • G. Ivanov
  • M. Jacewicz
  • E. Jiganov
  • T. Johansson
  • S. Keleta
  • O. Khakimova
  • I. Koch
  • F. Kren
  • S. Kullander
  • A. Kupść
  • A. Kuznetsov
  • P. Marciniewski
  • R. Meier
  • B. Morosov
  • C. Pauly
  • H. Petterson
  • Y. Petukhov
  • A. Povtorejko
  • A. Pricking
  • R. J.M.Y. Ruber
  • K. Schönning
  • W. Scobel
  • B. Shwartz
  • V. Sopov
  • J. Stepaniak
  • P. Thörngren-Engblom
  • V. Tikhomirov
  • A. Turwiecki
  • G. J. Wagner
  • M. Wolke
  • A. Yamamoto
  • J. Zabierowskf
  • J. Złomanćzuk


Publication details

JournalInternational Journal of Modern Physics A
DatePublished - 10 Feb 2011
Issue number3-4
Number of pages3
Pages (from-to)702-704
Original languageEnglish


The π0π0 production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to Tp = 1.4 GeV. For incident energies Tp > 1 GeV, i.e. in the region beyond the Roper excitation, the ΔΔ excitation process takes over. The data are well explained by the t-channel ΔΔ process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the π0π0-invariant mass distribution beyond that given by the conventional t-channel ΔΔ process. This is also true for the limiting case, where the protons are in the quasi-bound 2He state.

    Research areas

  • ΔΔ excitation, ABC effect, quasibound He, t-channel ΔΔ process

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