000127615 001__ 127615 000127615 005__ 20240610121302.0 000127615 0247_ $$2doi$$a10.1016/j.physletb.2011.12.027 000127615 0247_ $$2ISSN$$a1873-2445 000127615 0247_ $$2ISSN$$a0370-2693 000127615 0247_ $$2WOS$$aWOS:000300134400002 000127615 0247_ $$2arXiv$$aarXiv:1107.5277$$cnucl-ex 000127615 0247_ $$2Handle$$a2128/13287 000127615 0247_ $$2altmetric$$aaltmetric:462998 000127615 035__ $$9arXiv$$aarXiv:1107.5277$$cnucl-ex 000127615 037__ $$aFZJ-2012-00573 000127615 082__ $$a530 000127615 1001_ $$0P:(DE-HGF)0$$aAdlarson, P.$$b0 000127615 245__ $$aExclusive measurement of the η→ $\pi^+ \pi^-$ γ decay 000127615 260__ $$aAmsterdam$$bNorth-Holland Publ.$$c2012 000127615 3367_ $$2DRIVER$$aarticle 000127615 3367_ $$2DataCite$$aOutput Types/Journal article 000127615 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1482140563_5859 000127615 3367_ $$2BibTeX$$aARTICLE 000127615 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000127615 3367_ $$00$$2EndNote$$aJournal Article 000127615 500__ $$9arXiv 000127615 520__ $$9arXiv$$aAn exclusive measurement of the decay eta --> pi+ pi- gamma has been performed at the WASA facility at COSY. The eta mesons were produced in the fusion reaction pd --> 3He X at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13340\pm140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of eta --> pi+ pi- gamma. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the pi+ pi- system. 000127615 536__ $$0G:(DE-HGF)POF2-531$$a531 - Hadron Structure and Dynamics (HSD) (POF2-531)$$cPOF2-531$$fPOF II$$x0 000127615 588__ $$aDataset connected to CrossRef, juser.fz-juelich.de 000127615 650_7 $$2INSPIRE$$aeta: radiative decay 000127615 650_7 $$2INSPIRE$$api: angular distribution 000127615 650_7 $$2INSPIRE$$aphoton: energy spectrum 000127615 650_7 $$2INSPIRE$$aform factor: vector 000127615 650_7 $$2INSPIRE$$ainvariance: gauge 000127615 650_7 $$2INSPIRE$$abeam: momentum 000127615 650_7 $$2INSPIRE$$ap deuteron: fusion 000127615 650_7 $$2INSPIRE$$aJuelich COSY PS 000127615 650_7 $$2INSPIRE$$amass spectrum: (pi+ pi- photon) 000127615 650_7 $$2INSPIRE$$aeta: hadroproduction 000127615 650_7 $$2INSPIRE$$aexperimental results 000127615 650_7 $$2INSPIRE$$aeta --> pi+ pi- photon 000127615 650_7 $$2INSPIRE$$ap deuteron --> helium eta 000127615 650_7 $$2INSPIRE$$a1.7 GeV/c 000127615 693__ $$0EXP:(DE-Juel1)WASA-at-COSY-20170712$$5EXP:(DE-Juel1)WASA-at-COSY-20170712$$eWASA (Wide Angle Shower Apparatus) at COSY$$x0 000127615 7001_ $$0P:(DE-HGF)0$$aAdolph, C.$$b1 000127615 7001_ $$0P:(DE-HGF)0$$aAugustyniak, W.$$b2 000127615 7001_ $$0P:(DE-HGF)0$$aBardan, W.$$b3 000127615 7001_ $$0P:(DE-HGF)0$$aBashkanov, M.$$b4 000127615 7001_ $$0P:(DE-Juel1)VDB103233$$aBednarski, T.$$b5 000127615 7001_ $$0P:(DE-HGF)0$$aBergmann, F. 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