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Isoscalar single-pion production in the region of Roper and d*(2380) resonances
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Natl Ctr Nucl Res, Dept Nucl Phys, Ul Hoza 69, PL-00681 Warsaw, Poland..
Jagiellonian Univ, Inst Phys, Prof Stanislawa Lojasiewicza 11, PL-30348 Krakow, Poland..
Univ Edinburgh, Sch Phys & Astron, James Clerk Maxwell Bldg,Peter Guthrie Tait Rd, Edinburgh EH9 3FD, Midlothian, Scotland..
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2017 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 774, p. 599-607Article in journal (Refereed) Published
Abstract [en]

Exclusive measurements of the quasi-free pn -> pp pi(-) and pp -> pp pi(0) reactions have been performed by means of pd collisions at T-p= 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region T-p= 0.95-1.3 GeV (root s = 2.3-2.46 GeV), which includes the regions of triangle(1232), N*(1440) and d*(2380) resonance excitations. From these measurements the isoscalar single-pion production has been extracted, for which data existed so far only below T-p = 1 GeV. We observe a substantial increase of this cross section around 1 GeV, which can be related to the Roper resonance N*(1440), the strength of which shows up isolated from the triangle resonance in the isoscalar (N pi)(I=0) invariant-mass spectrum. No evidence for a decay of the dibaryon resonance d*(2380) into the isoscalar (NN pi)(I=0) channel is found. An upper limit of 180 mu b (90% CL.) corresponding to a branching ratio of 9% has been deduced.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 774, p. 599-607
Keywords [en]
Single-pion production, Isoscalar part, Roper resonance, Dibaryon resonance
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-344327DOI: 10.1016/j.physletb.2017.10.015ISI: 000414973200078OAI: oai:DiVA.org:uu-344327DiVA, id: diva2:1188835
Funder
German Research Foundation (DFG), CL 214/3-1German Research Foundation (DFG), CL 214/3-2Available from: 2018-03-08 Created: 2018-03-08 Last updated: 2018-03-08Bibliographically approved

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Adlarson, PatrikFransson, KjellGullström, Carl-OskarHeijkenskjöld, LenaJohansson, TordKupsc, AndrzejMarciniewski, PawelPszczel, DamianWolke, MagnusZlomanczuk, Jozef

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Adlarson, PatrikFransson, KjellGullström, Carl-OskarHeijkenskjöld, LenaJohansson, TordKupsc, AndrzejMarciniewski, PawelPszczel, DamianWolke, MagnusZlomanczuk, Jozef
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