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Importance of d-wave contributions in the charge symmetry breaking reaction dd -> He-4 pi(0)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. Johannes Gutenberg Univ Mainz, Inst Kernphys, Johann Joachim Becher Weg 45, D-55128 Mainz, Germany.
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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2018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 781, p. 645-650Article in journal (Refereed) Published
Abstract [en]

This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction dd -> He-4 pi(0) using the WASA-at-COSY detector setup at an excess energy of Q = 60 MeV. The determined differential cross section can be parametrized as d sigma/d Omega = a + b cos(2) theta*, where theta* is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are a = (1.55 +/- 0.46(stat)(-0.8)(+0.32)(syst)) pb/sr and b = (13.1 +/- 2.1(stat)(-2.7)(+1.0)(syst)) pb/sr. The data are compatible with vanishing p-waves and a sizable d-wave contribution. This finding should strongly constrain the contribution of the A isobar to the dd -> He-4 pi(0) reaction and is, therefore, crucial for a quantitative understanding of quark mass effects in nuclear production reactions.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 781, p. 645-650
Keywords [en]
Charge symmetry breaking, Deuteron deuteron interactions, Pion production
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-358693DOI: 10.1016/j.physletb.2018.04.037ISI: 000435653100082OAI: oai:DiVA.org:uu-358693DiVA, id: diva2:1245652
Funder
EU, FP7, Seventh Framework Programme, 227431Swedish Research CouncilKnut and Alice Wallenberg FoundationAvailable from: 2018-09-05 Created: 2018-09-05 Last updated: 2018-09-05Bibliographically approved

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

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