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THE pp -> pp pi(0)pi(0) REACTION AND ITS LIMITING CASE, FUSION TO QUASI-BOUND (2)He, IN SEARCH OF THE ABC EFFECT
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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
Abstract [en]

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 (2)He state.

Place, publisher, year, edition, pages
2011. Vol. 26, no 3-4, 702-704 p.
Keyword [en]
Delta Delta excitation, t-channel Delta Delta process, quasibound (2)He, ABC effect
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-67514DOI: 10.1142/S0217751X1105258XISI: 000287529800097OAI: oai:DiVA.org:su-67514DiVA: diva2:470332
Note
authorCount :43Available from: 2011-12-28 Created: 2011-12-28 Last updated: 2017-12-08Bibliographically approved

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Thörngren Engblom, Pia
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