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Measurement of the ω → π+ππ0 Dalitz plot distribution: The WASA-at-COSY Collaboration
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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2017 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 770, p. 418-425Article in journal (Refereed) Published
Abstract [en]

Using the production reactions pd -> He-3 omega and pp -> pp omega, the Dalitz plot distribution for the omega -> pi(+)pi(-)pi(0)decay is studied with the WASA detector at COSY, based on a combined data sample of (4.408 +/- 0.042) x 10(4) events. The Dalitz plot density is parametrised by a product of the P-wave phase space and a polynomial expansion in the normalised polar Dalitz plot variables Z and phi. For the first time, a deviation from pure P-wave phase space is observed with a significance of 4.1 sigma. The deviation is parametrised by a linear term 1+2 alpha Z, with alpha determined to be +0.147 +/- 0.036, consistent with the expectations of rho-meson-type final-state interactions of the P-wave pion pairs. (C) 2017 The Author. Published by Elsevier B.V.

Place, publisher, year, edition, pages
2017. Vol. 770, p. 418-425
Keywords [en]
Decays of other mesons, Meson-meson interactions, Light mesons
National Category
Astronomy, Astrophysics and Cosmology Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-329932DOI: 10.1016/j.physletb.2017.03.050ISI: 000404196500054OAI: oai:DiVA.org:uu-329932DiVA, id: diva2:1180727
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationEU, FP7, Seventh Framework Programme, 2008-1; 227431
Note

Title in WoS: Measurement of the omega -> pi(+)pi(-)pi(0) Dalitz plot distribution

Available from: 2018-02-06 Created: 2018-02-06 Last updated: 2018-02-06Bibliographically approved

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Adlarson, PatrikCalén, HansFransson, KjellGullström, Carl-OscarHeijkenskjöld, LenaJohansson, TordKupsc, AndrzejMarcinievski, PawelWolke, MagnusZlomanczuk, Jozef
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