pi pi production in proton-proton collisions
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
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.
Roper excitation, ΔΔ excitation, σ channel enhancement, ABC effect, ππ interaction
IdentifiersURN: urn:nbn:se:uu:diva-16892DOI: 10.1142/S0217751X07035720ISI: 000250926800039OAI: oai:DiVA.org:uu-16892DiVA: diva2:44663