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pi pi production in proton-proton collisions
Physikalisches Institut, Universität Tübingen.
Uppsala University, The Svedberg Laboratory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
Uppsala University, The Svedberg Laboratory.
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2007 (English)In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 22, no 2-3, 509-513 p.Article in journal (Refereed) Published
Abstract [en]

At CELSIUS-WASA the two-pion production in proton-proton collisisons has been measured exclusively from threshold up to the energy regime, where both of the collision partners are expected to be excited to the Δ state. The measurements constitute the first kinematically complete data samples of solid statistics in this energy range. Most of the data have been obtained for the π+π- and π0π0channels. Whereas at near-threshold energies the differential distributions can be succesfully explained by chiral dynamics and Roper excitation, respectively, the data for the π+π- channel in the ΔΔ region can be described only, if the special configuration (ΔΔ)0+ is assumed. The data for the π0π0 channel moreover exhibit a low-mass enhancement in the π0π0 invariant mass spectrum, which is reminiscent of the ABC-effect found in double-pionic fusion to light nuclei.

Place, publisher, year, edition, pages
2007. Vol. 22, no 2-3, 509-513 p.
Keyword [en]
Roper excitation, ΔΔ excitation, σ channel enhancement, ABC effect, ππ interaction
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-16892DOI: 10.1142/S0217751X07035720ISI: 000250926800039OAI: oai:DiVA.org:uu-16892DiVA: diva2:44663
Available from: 2008-06-16 Created: 2008-06-16 Last updated: 2017-12-08Bibliographically approved

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Calèn, HansFransson, KjellGustafsson, LeifHöistad, BoJacewicz, MarekJohansson, TordKeleta, SamsonKullander, SvenKupsc, AndrzejMarciniewski, PawelThörngren-Engblom, PiaZlomanczuk, Jozef

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Calèn, HansFransson, KjellGustafsson, LeifHöistad, BoJacewicz, MarekJohansson, TordKeleta, SamsonKullander, SvenKupsc, AndrzejMarciniewski, PawelThörngren-Engblom, PiaZlomanczuk, Jozef
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The Svedberg LaboratoryDepartment of Nuclear and Particle Physics
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International Journal of Modern Physics A
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