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Exclusive measurements of pd -> He-3 pi pi: The ABC effect revisited
Physikalisches Institut der Universität Tübingen, D-72076 Tübingen, Germany.
Joint Institute for Nuclear Research, Dubna, Russia.
Uppsala University, The Svedberg Laboratory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
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2006 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 637, no 4-5, 223-228 p.Article in journal (Refereed) Published
Abstract [en]

Exclusive measurements of the reactions pd -> He-3 pi(+)7 pi(-) and pd -> He-3 pi(0)pi(0) have been carried out at T-p = 0.893 GeV at the CELSIUS storage ring using the WASA detector. The pi(+)pi(-) channel evidences a pronounced enhancement at low invariant pi pi masses-as anticipated from previous inclusive measurements of the ABC effect. This enhancement is seen to be even much larger in the isoscalar pi(0)pi(0) channel. The differential distributions prove this enhancement to be of scalar-isoscalar nature. Delta Delta calculations give a good description of the data, if a boundstate condition is imposed for the intermediate Delta Delta system.

Place, publisher, year, edition, pages
2006. Vol. 637, no 4-5, 223-228 p.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-301870DOI: 10.1016/j.physletb.2006.03.082ISI: 000238399200003OAI: oai:DiVA.org:uu-301870DiVA: diva2:955563
Available from: 2016-08-25 Created: 2016-08-25 Last updated: 2016-08-25Bibliographically approved

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Calén, HansFransson, KjellGustafsson, LeifHöistad, BoJacewicz, MarekJohansson, TordKupsc, AndrzejMarciniewski, PawelRuber, RogerWolke, MagnusZlomanczuk, Jozef
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The Svedberg LaboratoryNuclear Physics
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Physics Letters B
Subatomic Physics

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