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000127615 035__ $$9arXiv$$aarXiv:1107.5277$$cnucl-ex
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000127615 1001_ $$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
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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.
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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
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