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Isospin decomposition of pp → NNππ cross sections - DO we see a sign of δ(1600) excitation in the nnπ+π+ CHANNEL?

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  • T. Skorodko
  • D. Bogoslowsky
  • H. CalÉn
  • H. Clement
  • 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
  • R. J.M.Y. Ruber
  • K. SchÖnning
  • W. Scobel
  • B. Shwartz
  • V. Sopov
  • J. Stepaniak
  • P. ThÖrngren-Engblom
  • V. Tikhomirov
  • A. Turowiecki
  • G. J. Wagner
  • M. Wolke
  • A. Yamamoto
  • J. Zabierowski
  • J. Złomanćzuk


Publication details

JournalInternational Journal of Modern Physics A
DatePublished - 30 Jan 2009
Issue number2-3
Number of pages4
Pages (from-to)450-453
Original languageEnglish


The two-pion production in pp-collisions has been investigated in exclusive measurements from threshold up to Tp = 1.36 GeV. Total and differential cross sections have been obtained for the channels pnπ+π0, ppπ+π-, ppπ0π0 and also nnπ+π+. For intermediate incident energies Tp > 1 GeV, i.e. in the region, which is beyond the Roper excitation but at the onset of δδ excitation the total ppπ0π0 cross section falls behind theoretical predictions by as much as an order of magnitude near 1.2 GeV, whereas the nnπ+π+ cross section is a factor of five larger than predicted. A model-unconstrained isospin decompostion of the cross section points to a significant contribution of an isospin 3/2 resonance other than the δ(1232). As a possible candidate the δ(1600) is discussed.

    Research areas

  • δδ excitation, δ(1600) excitation, Isospin decomposition, Poper resonance

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