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Low-mass pi pi enhancement in baryonic pi pi production: ABC effect revised by exclusive measurements
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, 625-628 p.Article in journal (Refereed) Published
Abstract [en]

The ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of double-pionic fusion to nuclear bound states - has been investigated since 40 years by inclusive measurements without providing a conclusive interpretation. First exclusive measurements to this topic have now been carried out at CELSIUS-WASA. They confirm a huge ππ threshold enhancement, prove it to be of scalar-isoscalar nature, i.e., a σ-channel phenomenon and reveal the theoretically predicted high-mass enhancement in inclusive spectra to be of πππ rather than of ππ nature - falsifying thus corresponding model predictions for the ABC effect. From the kinematically complete data samples we infer that the interaction between the two Δ particles created in this process is of crucial importance.

Place, publisher, year, edition, pages
2007. Vol. 22, no 2-3, 625-628 p.
Keyword [en]
ABC effect, σ channel enhancement, ∆∆ interaction, medium effects
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-16890DOI: 10.1142/S0217751X07035987ISI: 000250926800065OAI: oai:DiVA.org:uu-16890DiVA: diva2:44661
Available from: 2008-06-16 Created: 2008-06-16 Last updated: 2011-04-14Bibliographically approved

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Calèn, HansFransson, KjellGustafsson, LeifHöistad, BoJacewicz, MarekJohansson, TordKeleta, SamsonKullander, SvenThörngren-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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