The Pp -> Pp Pi(0)Pi(0) Reaction And Its Limiting Case, Fusion To Quasi-Bound He-2, In Search Of The Abc Effect

T Skorodko,M Bashkanov, D Bogoslowsky,H Calen,H Clement,E Doroshkevich,C Ekstrom, K Fransson,Lena Gustafsson,B Hoistad, G A Ivanov,M Jacewicz, E Jiganov,T Johansson, S Keleta,O Khakimova,I Koch, F Kren,S Kullander, A Kupśc,A A Kuznetsov, P Marciniewski,R Meier,B Morosov,C Pauly, H Petterson, Y Petukhov, A Povtorejko, A Pricking,R J M Y Ruber,K Schonning,W Scobel,B Shwartz,V Sopov,J Stepaniak, P Thorngrenengblom, V O Tikhomirov, A Turwiecki, G J Wagner, M Wolke,Ayako Yamamoto, J Zabierowskf,J Złomanczuk

INTERNATIONAL JOURNAL OF MODERN PHYSICS A（2011）

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摘要

The pi(0)pi(0) production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to T-p = 1.4 GeV. For incident energies T-p > 1 GeV, i.e. in the region beyond the Roper excitation, the Delta Delta excitation process takes over. The data are well explained by the t-channel Delta Delta process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the pi(0)pi(0)-invariant mass distribution beyond that given by the conventional t-channel Delta Delta process. This is also true for the limiting case, where the protons are in the quasi-bound He-2 state.

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关键词

Delta Delta excitation, t-channel Delta Delta process, quasibound He-2, ABC effect

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