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Measurement of the matrix elements for the decays eta -> pi(+)pi(-)pi(0) and eta/eta ' -> pi(0)pi(0)pi(0)
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2015 (English)In: Physical Review D, ISSN 1550-7998, Vol. 92, no 1, 012014Article in journal (Refereed) Published
Abstract [en]

Based on a sample of 1.31 x 10(9) J/psi events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 eta -> pi(+)pi(-)pi(0) events, 33,908 eta -> pi(0)pi(0)pi(0) events, and 1,888 eta' -> pi(0)pi(0)pi(0) events are performed. The measured matrix elements of eta -> pi(+)pi(-)pi(0) are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of eta -> pi(0)pi(0)pi(0) and eta' -> pi(0)pi(0)pi(0) are determined to be -0.055 +/- 0.014 +/- 0.004 and -0.640 +/- 0.046 +/- 0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.

Place, publisher, year, edition, pages
2015. Vol. 92, no 1, 012014
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-261263DOI: 10.1103/PhysRevD.92.012014ISI: 000358851800001OAI: oai:DiVA.org:uu-261263DiVA: diva2:852206
Available from: 2015-09-08 Created: 2015-08-31 Last updated: 2015-09-08Bibliographically approved

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Johansson, TordKupsc, AndrezejLi, CuiPettersson, JoachimSchönning, KarinWolke, Magnus
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