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24 April 2024

» arxiv » 0906.3087

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Two-Pion Production in Proton-Proton Collisions -- Experimental Total Cross Sections and their Isospin Decomposition
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. Kullander ; A. 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 ;
Date:	17 Jun 2009
Abstract:	The two-pion production in pp-collisions has been investigated at CELSIUS in exclusive measurements from threshold up to $T_p$ = 1.36 GeV. Total and differential cross sections have been obtained for the channels $pnpi^+pi^0$, $pppi^+pi^-$, $pppi^0pi^0$ and also $nnpi^+pi^+$. For intermediate incident energies $T_p >$ 1 GeV, i.e. in the region which is beyond the Roper excitation but at the onset of $DeltaDelta$ excitation, the total $pppi^0pi^0$ cross section falls behind theoretical predictions by as much as an order of magnitude near 1.2 GeV, whereas the $nnpi^+pi^+$ cross section is a factor of five larger than predicted. An isospin decompostion of the total cross sections exhibits a s-channel-like energy dependence in the region of the Roper excitation as well as a significant contribution of an isospin 3/2 resonance other than the $Delta(1232)$. As possible candidates the $Delta(1600)$ and the $Delta(1700)$ are discussed.
Source:	arXiv, 0906.3087
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