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ISOSPIN DECOMPOSITION OF pp -> NN pi pi CROSS SECTIONS: DO WE SEE A SIGN OF Delta(1600) EXCITATION IN THE nn pi(+)pi(+) CHANNEL?
Uppsala University, The Svedberg Laboratory.
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2009 (English)In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 24, no 2-3, 450-453 p.Article in journal (Refereed) Published
Abstract [en]

The two-pion production in pp-collisions has been investigated in exclusive measurements from threshold up to T-p = 1.36 GeV. Total and differential cross sections have been obtained for the channels pn pi(+) pi(0), pp pi(+) pi(-), pp pi(0)pi(0) and also nn pi(+)pi(+). For intermediate incident energies T-p > 1 GeV, i.e. in the region, which is beyond the Roper excitation but at the onset of Delta Delta excitation the total pp pi(0)pi(0) cross section falls behind theoretical predictions by as much as an order of magnitude near 1.2 GeV, whereas the nn pi(+)pi(+) cross section is a factor of five larger than predicted. A model-unconstrained isospin decompostion of the cross section points to a significant contribution of an isospin 3/2 resonance other than the Delta(1232). As a possible candidate the Delta(1600) is discussed.

Place, publisher, year, edition, pages
2009. Vol. 24, no 2-3, 450-453 p.
Keyword [en]
Isospin decomposition, poper resonance, Delta Delta excitation, Delta (1600) excitation
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-149121DOI: 10.1142/S0217751X09043821ISI: 000263880300039OAI: oai:DiVA.org:uu-149121DiVA: diva2:404085
Available from: 2011-03-15 Created: 2011-03-15 Last updated: 2017-12-11Bibliographically approved

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Kupsc, AndrzejSchönning, Karin

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The Svedberg LaboratoryDepartment of Physics and Astronomy
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