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25 April 2024

» arxiv » 1007.0405

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Delta Delta Excitation in Proton-Proton Induced pi0pi0 Production
T. Skorodko ; M. Bashkanov ; D. Bogoslawsky ; H. Calen ; H. Clement ; E. Doroshkevich ; L. Demiroers ; C. Ekstroem ; K. Fransson ; L. Gustafsson ; B. Hoistad ; G. Ivanov ; M. Jacewicz ; E. Jiganov ; T. Johansson ; O. Khakimova ; S. Keleta ; I. Koch ; F. Kren ; S. Kullander ; A. Kupsc ; P. Marciniewski ; R. Meier ; B. Morosov ; C. Pauly ; H. Petren ; Y. Petukhov ; A. Povtorejko ; R.J.M.Y. Ruber ; K. Schoenning ; W. Scobel ; B. Shwartz ; J. Stepaniak ; P. Thoerngren-Engblom ; V. Tikhomirov ; G.J. Wagner ; M. Wolke ; A. Yamamoto ; J. Zabierowski ; J. Zlomanczuk ;
Date:	2 Jul 2010
Abstract:	Exclusive measurements of the $pp o pppi^0pi^0$ 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 $T_p ge$ 1 GeV, where the $DeltaDelta$ excitation becomes the leading process. No evidence is found for a significant ABC effect beyond that given by the conventional $t$-channel $DeltaDelta$ excitation. This holds also for the double-pionic fusion to the quasibound $^2$He. The data are compared to model predictions, which are based on both pion and $ ho$ exchange. Total and differential cross sections are at variance with these predictions and call for a profound modification of the $ ho$-exchange. A phenomenological modification allowing only a small $ ho$ exchange contribution leads to a quantitative description of the data.
Source:	arXiv, 1007.0405
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