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Measurement of the np -> np pi(0)pi(0) reaction in search for the recently observed d* (2380) resonance
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
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2015 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 743, 325-332 p.Article in journal (Refereed) Published
Abstract [en]

Exclusive measurements of the quasi-free np --> np pi(0)pi(0) reaction have been performed by means of dp collisions at T-d = 2.27 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region root s = (2.35-2.46) GeV, which includes the region of the ABC effect and its associated d* (2380) resonance. Adding the d* resonance amplitude to that for the conventional processes leads to a reasonable description of the data. The observed resonance effect in the total cross section is in agreement with the predictions of Faldt and Wilkin as well with those of Albadajedo and Oset. The ABC effect, i.e. the low-mass enhancement in the pi(0)pi(0)-invariant mass spectrum, is found to be very modest - if present at all, which might pose a problem to some of its interpretations.

Place, publisher, year, edition, pages
2015. Vol. 743, 325-332 p.
Keyword [en]
Two-pion production, ABC effect and resonance structure, Dibaryon resonance
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-253065DOI: 10.1016/j.physletb.2015.02.067ISI: 000352147500050OAI: oai:DiVA.org:uu-253065DiVA: diva2:820145
Available from: 2015-06-11 Created: 2015-05-20 Last updated: 2017-12-04Bibliographically approved

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Adlarsona, PatrikCalén, HansFransson, Kjell E. I.Gullström, Carl-OscarHeijkenskjöld, LenaHöistad, BoJohansson, TordKupsc, AndrzejMarciniewski, PawelPszczel, DamianPyszniak, AndrzejWolke, MagnusZlomanczuk, Jozef
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