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The branching ratio omega -> pi(+) pi(-) revisited
Forschungszentrum Jülich, Institut für Kernphysik; Forschungszentrum Jülich, Institute for Advanced Simulation; Forschungszentrum Jülich, Jülich Center for Hadron Physics.
Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik.
Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik; Universität Bonn, Bethe Center for Theoretical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. National Centre for Nuclear Research, High Energy Physics Department, Warsaw.ORCID iD: 0000-0003-4937-2270
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2017 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 77, no 2, article id 98Article in journal (Refereed) Published
Abstract [en]

We analyze themost recent data for the pion vector form factor in the timelike region, employing a modelindependent approach based on dispersion theory. We confirm earlier observations about the inconsistency of different modern high-precision data sets. Excluding the BaBar data, we find an updated value for the isospin-violating branching ratio B(omega -> pi(+) pi(-)) = (1.46 +/- 0.08) x 10(-2). As a side result, we also extract an improved value for the pion vector or charge radius, root < r(V)(2)> = 0.6603(5)(4) fm, where the first uncertainty is statistical as derived from the fit, while the second estimates the possible size of nonuniversal radiative corrections. In addition, we demonstrate that modern high-quality data for the decay. eta'-> pi(+) pi(-) will allow for an even improved determination of the transition strength omega -> pi(+) pi(-).

Place, publisher, year, edition, pages
2017. Vol. 77, no 2, article id 98
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Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-335761DOI: 10.1140/epjc/s10052-017-4651-xISI: 000411275600001OAI: oai:DiVA.org:uu-335761DiVA, id: diva2:1164063
Funder
German Research Foundation (DFG), TRR110; CRC 110Available from: 2017-12-08 Created: 2017-12-08 Last updated: 2017-12-08Bibliographically approved

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