THE pp -> pp pi(0)pi(0) REACTION AND ITS LIMITING CASE, FUSION TO QUASI-BOUND He-2, IN SEARCH OF THE ABC EFFECT
2011 (English)In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 26, no 3-4, 702-704 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2011. Vol. 26, no 3-4, 702-704 p.
Delta Delta excitation, t-channel Delta Delta process, quasibound He-2, ABC effect
IdentifiersURN: urn:nbn:se:uu:diva-149718DOI: 10.1142/S0217751X1105258XISI: 000287529800097OAI: oai:DiVA.org:uu-149718DiVA: diva2:405414