THE pp → ppπ 0 π 0 REACTION AND ITS LIMITING CASE, FUSION TO QUASI-BOUND 2 He, IN SEARCH OF THE ABC EFFECT
- SKORODKO, T.
- BASHKANOV, M.
- IVANOV, G.
- JACEWICZ, M.
- JIGANOV, E.
- JOHANSSON, T.
- KELETA, S.
- KHAKIMOVA, O.
- KOCH, I.
- KREN, F.
- KULLANDER, S.
- KUPŚĆ, A.
- BOGOSLOWSKY, D.
- KUZNETSOV, A.
- MARCINIEWSKI, P.
- MEIER, R.
- MOROSOV, B.
- PAULY, C.
- PETTERSON, H.
- PETUKHOV, Y.
- POVTOREJKO, A.
- PRICKING, A.
- RUBER, R. J. M. Y.
- CALÉN, H.
- SCHÖNNING, K.
- SCOBEL, W.
- SHWARTZ, B.
- SOPOV, V.
- STEPANIAK, J.
- THÖRNGREN-ENGBLOM, P.
- TIKHOMIROV, V.
- TURWIECKI, A.
- WAGNER, G. J.
- WOLKE, M.
- CLEMENT, H.
- YAMAMOTO, A.
- ZABIEROWSKF, J.
- ZŁOMANĆZUK, J.
- DOROSHKEVICH, E.
- EKSTRÖM, C.
- FRANSSON, K.
- GUSTAFSSON, L.
- HÖISTAD, B.
Publication date
January 2011
DOI Publisher
World Scientific Pub Co Pte Lt ISSN
0217-751XAbstract
The π0π0 production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to Tp = 1.4 GeV. For incident energies Tp > 1 GeV, i.e. in the region beyond the Roper excitation, the ΔΔ excitation process takes over. The data are well explained by the t-channel ΔΔ process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the π0π0-invariant mass distribution beyond that given by the conventional t-channel ΔΔ process. This is also true for the limiting case, where the protons are in the quasi-bound 2He state
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