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19 April 2024

» arxiv » nucl-ex/0508011

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Exclusive Measurements of $pd o ^3He pipi$ : the $ABC$ Effect Revisited
M. Bashkanov ; D. Bogoslawsky ; H. Calén ; F. Cappellaro ; H. Clement ; L. Demiroers ; C. Ekström ; K. Fransson ; J. Greiff ; L. Gustafsson ; B. Höistad ; G. Ivanov ; M. Jacewicz ; E. Jiganov ; T. Johansson ; M.M. Kaskulov ; S. Keleta ; I. Koch ; S. Kullander ; A. Kup’s’c ; A. Kuznetsov ; P. Marciniewski ; R. Meier ; B. Morosov ; W. Oelert ; C. Pauly ; Y. Petukhov ; A. Povtorejko ; R.J.M.Y. Ruber ; W. Scobel ; T. Skorodko ; B. Shwartz ; V. Sopov ; J. Stepaniak ; V. Tchernyshev ; P. Thörngren-Engblom ; V. Tikhomirov ; A. Turowiecki ; G.J. Wagner ; M. Wolke ; A. Yamamoto ; J. Zabierowski ; J. Zlomanczuk ;
Date:	11 Aug 2005
Abstract:	Exclusive measurements of the reactions $pd o$ $^3He pi^+ pi^-$ and $pd o$ $^3He pi^0pi^0$ have been carried out at $T_p=0.895$ GeV at the CELSIUS storage ring using the WASA detector. The $pi^0pi^0$ channel shows a very strong enhancement at low invariant $pipi$ mass - as anticipated from previous inclusive measurements of the ABC effect. The $pi^+pi^-$ channel also exhibits such an enhancement, however, much less pronounced, thus raising the question about isospin breaking in this reaction. The differential distributions show this enhancement to be of scalar-isoscalar nature.
Source:	arXiv, nucl-ex/0508011
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