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Delta Delta excitation in proton-proton induced pi(0)pi(0) production
Uppsala University, The Svedberg Laboratory.
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2011 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 695, no 1-4, 115-123 p.Article in journal (Refereed) Published
Abstract [en]

Exclusive measurements of the pp -> pp pi(0)pi(0) reaction have been performed at CELSIUS/WASA at energies from threshold up to T-p = 1.3 GeV. Total and differential cross sections have been obtained. Here we concentrate on energies T-p >= GeV. where the Delta Delta excitation becomes the leading process. No evidence is found for a significant ABC effect beyond that given by the conventional t-channel Delta Delta excitation. This holds also for the double-pionic fusion to the quasibound He-2. The data are compared to model predictions, which are based on both pi- and rho-exchange. Total and differential cross sections are at variance with these predictions and call for a profound modification of the rho-exchange. A phenomenological modification allowing only a small rho-exchange contribution leads to a quantitative description of the data.

Place, publisher, year, edition, pages
2011. Vol. 695, no 1-4, 115-123 p.
Keyword [en]
Delta Delta excitation, Two-pion production, pi-exchange, rho-exchange
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-153231DOI: 10.1016/j.physletb.2010.11.030ISI: 000286708700021OAI: oai:DiVA.org:uu-153231DiVA: diva2:415713
Available from: 2011-05-09 Created: 2011-05-09 Last updated: 2016-05-10Bibliographically approved

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Kupsc, AndrzejSchönning, Karin
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The Svedberg LaboratoryHigh Energy PhysicsNuclear PhysicsDepartment of Physics and AstronomyApplied Nuclear Physics
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