Hauptseite > Publikationsdatenbank > Exclusive measurement of the η→ $\pi^+ \pi^-$ γ decay > print

001     127615
005     20240610121302.0
024 7 _ |a 10.1016/j.physletb.2011.12.027
|2 doi
024 7 _ |a 1873-2445
|2 ISSN
024 7 _ |a 0370-2693
|2 ISSN
024 7 _ |a WOS:000300134400002
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024 7 _ |a arXiv:1107.5277
|c nucl-ex
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024 7 _ |a 2128/13287
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024 7 _ |a altmetric:462998
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035 _ _ |9 arXiv
|a arXiv:1107.5277
|c nucl-ex
037 _ _ |a FZJ-2012-00573
082 _ _ |a 530
100 1 _ |a Adlarson, P.
|0 P:(DE-HGF)0
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245 _ _ |a Exclusive measurement of the η→ $\pi^+ \pi^-$ γ decay
260 _ _ |a Amsterdam
|c 2012
|b North-Holland Publ.
336 7 _ |a article
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336 7 _ |a Journal Article
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336 7 _ |a ARTICLE
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336 7 _ |a JOURNAL_ARTICLE
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336 7 _ |a Journal Article
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500 _ _ |9 arXiv
520 _ _ |9 arXiv
|a An 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.
536 _ _ |a 531 - Hadron Structure and Dynamics (HSD) (POF2-531)
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588 _ _ |a Dataset connected to CrossRef, juser.fz-juelich.de
650 _ 7 |a eta: radiative decay
|2 INSPIRE
650 _ 7 |a pi: angular distribution
|2 INSPIRE
650 _ 7 |a photon: energy spectrum
|2 INSPIRE
650 _ 7 |a form factor: vector
|2 INSPIRE
650 _ 7 |a invariance: gauge
|2 INSPIRE
650 _ 7 |a beam: momentum
|2 INSPIRE
650 _ 7 |a p deuteron: fusion
|2 INSPIRE
650 _ 7 |a Juelich COSY PS
|2 INSPIRE
650 _ 7 |a mass spectrum: (pi+ pi- photon)
|2 INSPIRE
650 _ 7 |a eta: hadroproduction
|2 INSPIRE
650 _ 7 |a experimental results
|2 INSPIRE
650 _ 7 |a eta --> pi+ pi- photon
|2 INSPIRE
650 _ 7 |a p deuteron --> helium eta
|2 INSPIRE
650 _ 7 |a 1.7 GeV/c
|2 INSPIRE
693 _ _ |5 EXP:(DE-Juel1)WASA-at-COSY-20170712
|e WASA (Wide Angle Shower Apparatus) at COSY
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