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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 universitet, The Svedberg-laboratoriet.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för kärn- och partikelfysik.
Uppsala universitet, The Svedberg-laboratoriet.
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2007 (engelsk)Inngår i: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 22, nr 2-3, s. 625-628Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2007. Vol. 22, nr 2-3, s. 625-628
Emneord [en]
ABC effect, σ channel enhancement, ∆∆ interaction, medium effects
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Identifikatorer
URN: urn:nbn:se:uu:diva-16890DOI: 10.1142/S0217751X07035987ISI: 000250926800065OAI: oai:DiVA.org:uu-16890DiVA, id: diva2:44661
Tilgjengelig fra: 2008-06-16 Laget: 2008-06-16 Sist oppdatert: 2017-12-08bibliografisk kontrollert

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Calèn, HansFransson, KjellGustafsson, LeifHöistad, BoJacewicz, MarekJohansson, TordKeleta, SamsonKullander, SvenThörngren-Engblom, PiaZlomanczuk, Jozef

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Calèn, HansFransson, KjellGustafsson, LeifHöistad, BoJacewicz, MarekJohansson, TordKeleta, SamsonKullander, SvenThörngren-Engblom, PiaZlomanczuk, Jozef
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