Exclusive measurements of pd -> He-3 pi pi: The ABC effect revisited

M. Bashkanov*, D. Bogoslawsky, H. Calen, F. Cappellaro, H. Clement, L. Demiroers, C. Ekstrom, K. Fransson, J. Greiff, L. Gustafsson, B. Hoistad, G. Vanov, M. Jacewicz, E. Jiganov, T. Johansson, O. Khakimova, M. M. Kaskulov, S. Keleta, I. Koch, F. KrenS. Kullander, A. Kupsc, A. Kuznetsov, P. Marciniewski, R. Meier, B. Morosov, W. Oelert, C. Pauly, Y. Petukho, A. Povtorejko, R. J. M. Y. Ruber, W. Scobel, T. Skorodko, B. Shwartz, V. Sopov, J. Stepaniak, V. Tchernyshev, 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

Exclusive measurements of the reactions pd -> He-3 pi(+)7 pi(-) and pd -> He-3 pi(0)pi(0) have been carried out at T-p = 0.893 GeV at the CELSIUS storage ring using the WASA detector. The pi(+)pi(-) channel evidences a pronounced enhancement at low invariant pi pi masses-as anticipated from previous inclusive measurements of the ABC effect. This enhancement is seen to be even much larger in the isoscalar pi(0)pi(0) channel. The differential distributions prove this enhancement to be of scalar-isoscalar nature. Delta Delta calculations give a good description of the data, if a boundstate condition is imposed for the intermediate Delta Delta system. (c) 2006 Elsevier B.V. All fights reserved.

Original languageEnglish
Pages (from-to)223-228
Number of pages6
JournalPhysics Letters B
Volume637
Issue number4-5
DOIs
Publication statusPublished - 15 Jun 2006

Keywords

  • SIGMA-MESON
  • NUCLEAR MEDIUM
  • RESONANCE
  • ISOSPIN

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