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New analysis of eta pi tensor resonances measured at the COMPASS experiment
Indiana Univ, Phys Dept, Bloomington, IN 47405 USA;Indiana Univ, Ctr Explorat Energy & Matter, Bloomington, IN 47403 USA.
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico.
Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany;Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany.
Thomas Jefferson Natl Accelerator Facil, Theory Ctr, Newport News, VA 23606 USA.
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2018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 779, p. 464-472Article in journal (Refereed) Published
Abstract [en]

We present a new amplitude analysis of the eta pi D-wave in the reaction pi(-) p -> eta pi(-) p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S-matrix, we find two resonances that can be identified with the a(2)(1320) and the excited a(2)(1700), and perform a comprehensive analysis of their pole positions. For the mass and width of the a(2) we find M = (1307 +/- 1 6) MeV and Gamma=(112 +/- 1 +/- 8) MeV, and for the excited state a(2)' we obtain M = (1720 +/- 10 +/- 60) MeV and Gamma = (280 +/- 10 +/- 70) MeV, respectively.

Place, publisher, year, edition, pages
2018. Vol. 779, p. 464-472
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-353208DOI: 10.1016/j.physletb.2018.01.017ISI: 000429098900061OAI: oai:DiVA.org:uu-353208DiVA, id: diva2:1217405
Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2018-06-13Bibliographically approved

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Schönning, Karin

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