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Measurement of Γ(η→π+π-γ)/Γ(η→π+π-π0) with the KLOE detector
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2013 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 718, no 3, p. 910-914Article in journal (Refereed) Published
Abstract [en]

The ratio Rη=Γ(η→π+π-γ)/Γ(η→π+π-π0) has been measured by analysing 22 million φ→ηγ decays collected by the KLOE experiment at DAΦNE, corresponding to an integrated luminosity of 558 pb-1. The η→π+π-γ proceeds both via the ρ resonant contribution, and possibly a non-resonant direct term, connected to the box anomaly. Our result, Rη=0.1856±0.0005stat±0.0028syst, points out a sizable contribution of the direct term to the total width. The di-pion invariant mass for the η→π+π-γ decay could be described in a model-independent approach in terms of a single free parameter, α. The determined value of the parameter α is α=(1.32±0.08stat-0.09syst+0.10±0.02theo) GeV-2.

Place, publisher, year, edition, pages
2013. Vol. 718, no 3, p. 910-914
Keywords [en]
η decays, Chiral perturbation theory, E+e- collisions, Light mesons
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-195007DOI: 10.1016/j.physletb.2012.11.032ISI: 000314259500018OAI: oai:DiVA.org:uu-195007DiVA, id: diva2:606896
Available from: 2013-02-21 Created: 2013-02-20 Last updated: 2017-12-06Bibliographically approved

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Caldeira Balkeståhl, LiJacewicz, MarekJohansson, TordKupsc, AndrzejWolke, Magnus

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