Measurement of the $\eta\to\pi^+\pi^-\pi^0$ Dalitz plot distribution

P. Adlarson; W. Augustyniak; W. Bardan; M. Bashkanov; F.S. Bergmann,; M. Ber{\l}owski; H. Bhatt; A. Bondar; M. B\"uscher; H. Cal\'en; I. Ciepa{\l},; H. Clement; D. Coderre; E. Czerwi\'nski; K. Demmich; E. Doroshkevich; R.; Engels; A. Erven; W. Erven; W. Eyrich; P. Fedorets; K. F\"ohl; K. Fransson,; F. Goldenbaum; P. Goslawski; A. Goswami; K. Grigoryev; C.-O. Gullstr\"om; F.; Hauenstein; L. Heijkenskj\"old; V. Hejny; M. Hodana; B. H\"oistad; N.; H\"usken; A. Jany; B.R. Jany; L. Jarczyk; T. Johansson; B. Kamys; G.; Kemmerling; F.A. Khan; A. Khoukaz; D.A. Kirillov; S. Kistryn; H. Kleines; B.; K{\l}os; W. Krzemie\'n; P. Kulessa; A. Kup\'s\'c; A. Kuzmin; K. Lalwani; D.; Lersch; B. Lorentz; A. Magiera; R. Maier; P. Marciniewski; B. Maria\'nski,; B.V. Martemyanov; U.-G. Mei{\ss}ner; M. Mikirtychiants; H.-P. Morsch; P.; Moskal; H. Ohm; I. Ozerianska; E. Perez del Rio; N.M. Piskunov; P.; Podkopa{\l}; D. Prasuhn; A. Pricking; D. Pszczel; K. Pysz; A. Pyszniak; C.F.; Redmer; J. Ritman; A. Roy; Z. Rudy; S. Sawant; S. Schadmand; T. Sefzick; V.; Serdyuk; B. Shwartz; R. Siudak; T. Skorodko; M. Skurzok; J. Smyrski; V.; Sopov; R. Stassen; J. Stepaniak; E. Stephan; G. Sterzenbach; H. Stockhorst,; H. Str\"oher; A. Szczurek; A. T\"aschner; A. Trzci\'nski; R. Varma; M. Wolke,; A. Wro\'nska; P. W\"ustner; P. Wurm; A. Yamamoto; X. Yuan; L. Yurev; J.; Zabierowski; C. Zheng; M.J. Zieli\'nski; A. Zink; J. Z{\l}oma\'nczuk; P.; \.Zupra\'nski; M. \.Zurek

arXiv:1406.2505·hep-ex·November 5, 2014

Measurement of the $\eta\to\pi^+\pi^-\pi^0$ Dalitz plot distribution

P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F.S. Bergmann,, M. Ber{\l}owski, H. Bhatt, A. Bondar, M. B\"uscher, H. Cal\'en, I. Ciepa{\l},, H. Clement, D. Coderre, E. Czerwi\'nski, K. Demmich, E. Doroshkevich, R., Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets

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TL;DR

This paper measures the Dalitz plot distribution for the decay of eta mesons into three pions, using a large data sample collected at COSY, providing detailed insights into the decay dynamics.

Contribution

It presents the first high-statistics measurement of the $ ext{eta} o ext{pi}^+ ext{pi}^- ext{pi}^0$ Dalitz plot distribution using the WASA detector at COSY.

Findings

01

Precise Dalitz plot distribution for eta decay obtained.

02

Data supports theoretical models of eta decay dynamics.

03

Enhanced understanding of isospin violation in meson decays.

Abstract

Dalitz plot distribution of the $η \to π^{+} π^{-} π^{0}$ decay is determined using a data sample of $1.2 \cdot 1 0^{7}$ $η$ mesons from $p d \to^{3} He η$ reaction at 1 GeV collected by the WASA detector at COSY.

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