Delta Delta excitation in proton-proton induced pi(0)pi(0) production

T. Skorodko, M. Bashkanov, D. Bogoslawsky, H. Calen, H. Clement*, E. Doroshkevich, L. Demiroers, C. Ekstrom, K. Fransson, L. Gustafsson, B. Hoistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, O. Khakimova, S. Keleta, I. Koch, F. Kren, S. KullanderA. Kupsc, P. Marciniewski, R. Meier, B. Morosov, C. Pauly, H. Petren, Y. Petukhov, A. Povtorejko, R. J. M. Y. Ruber, K. Schonning, W. Scobel, B. Shwartz, J. Stepaniak, P. Thorngren-Engblom, V. Tikhomirov, 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

Exclusive measurements of the pp -> pp pi(0)pi(0) reaction have been performed at CELSIUS/WASA at energies from threshold up to T-p = 1.3 GeV. Total and differential cross sections have been obtained. Here we concentrate on energies T-p >= GeV. where the Delta Delta excitation becomes the leading process. No evidence is found for a significant ABC effect beyond that given by the conventional t-channel Delta Delta excitation. This holds also for the double-pionic fusion to the quasibound He-2. The data are compared to model predictions, which are based on both pi- and rho-exchange. Total and differential cross sections are at variance with these predictions and call for a profound modification of the rho-exchange. A phenomenological modification allowing only a small rho-exchange contribution leads to a quantitative description of the data. (C) 2010 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)115-123
Number of pages9
JournalPhysics Letters B
Volume695
Issue number1-4
DOIs
Publication statusPublished - 10 Jan 2011

Keywords / Materials (for Non-textual outputs)

  • Delta Delta excitation
  • Two-pion production
  • pi-exchange
  • rho-exchange
  • BOSE-EINSTEIN CORRELATIONS
  • DOUBLE-PION PRODUCTION
  • 2-PION PRODUCTION
  • ROPER RESONANCE
  • NUCLEON COLLISIONS
  • SINGLE-PION
  • PP
  • ENHANCEMENT
  • THRESHOLD

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