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The pp → dπ+π0 reaction - A case of δδ excitation without ABC-effect

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Author(s)

  • F. Kren
  • 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
  • S. Kullander
  • A. Kupać
  • 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
  • T. Skorodko
  • V. Sopov
  • J. Stepaniak
  • P. E. Tegner
  • P. ThÖrngren-Engblom
  • V. Tikhomirov
  • A. Turowiecki
  • G. J. Wagner
  • M. Wolke
  • A. Yamamoto
  • J. Zabierowski
  • J. Złomanćzuk

Department/unit(s)

Publication details

JournalInternational Journal of Modern Physics A
DatePublished - 30 Jan 2009
Issue number2-3
Volume24
Number of pages3
Pages (from-to)561-563
Original languageEnglish

Abstract

The ABC effect, a low-mass enhancement in the invariant ππ mass, is observed in double-pionic fusion reactions leading to a bound nuclear system in the final state. From previous measurements there have been indications that this phenomenon is resctricted to the σ channel of the ππ system. With exclusive measurements of the pp → dπ+π0 reaction at Tp = 1.1 GeV we demonstrate that, indeed, the ABC effect does not occur in the vector-isovector ππ channel (ρ channel) despite the fact that the δδ excitation is oberved to be the dominant reaction process. We also show that this reaction is well described by a t-channel δδ excitation with the subsequent decay into the vector-isovector ππ channel given by the ρ channel operator.

    Research areas

  • δδ excitation, ρ channel, ABC effect

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