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000170112 0247_ $$2arXiv$$aarXiv:1407.2119
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000170112 0247_ $$2inspire$$ainspire:1305286
000170112 037__ $$aDESY-2014-03012
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000170112 0881_ $$aDESY-14-116; arXiv:1407.2119
000170112 088__ $$2DESY$$aDESY-14-116
000170112 088__ $$2arXiv$$aarXiv:1407.2119
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000170112 245__ $$aSpin density matrix elements in exclusive $\omega$ electroproduction on $\mathrm{^1 H}$ and $\mathrm{^2 H}$ targets at 27.5 GeV beam energy
000170112 260__ $$aBerlin$$bSpringer$$c2014
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000170112 520__ $$aExclusive electroproduction of $\omega $ mesons on unpolarized hydrogen and deuterium targets is studied in the kinematic region of $Q^2> 1.0$  GeV$^2$ , 3.0 GeV  $< W <$  6.3 GeV, and $-t'< 0.2$  GeV$^2$ . Results on the angular distribution of the $\omega $ meson, including its decay products, are presented. The data were accumulated with the HERMES forward spectrometer during the 1996–2007 running period using the 27.6 GeV longitudinally polarized electron or positron beam of HERA. The determination of the virtual-photon longitudinal-to-transverse cross-section ratio reveals that a considerable part of the cross section arises from transversely polarized photons. Spin density matrix elements are presented in projections of $Q^2$ or $-t'$ . Violation of $s$ -channel helicity conservation is observed for some of these elements. A sizable contribution from unnatural-parity-exchange amplitudes is found and the phase shift between those amplitudes that describe transverse $\omega $ production by longitudinal and transverse virtual photons, $\gamma ^{*L} \rightarrow \omega _{T}$ and $\gamma ^{*T} \rightarrow \omega _{T}$ , is determined for the first time. A hierarchy of helicity amplitudes is established, which mainly means that the unnatural-parity-exchange amplitude describing the $\gamma ^*_T \rightarrow \omega _T$ transition dominates over the two natural-parity-exchange amplitudes describing the $\gamma ^*_L \rightarrow \omega _L$ and $\gamma ^*_T \rightarrow \omega _T$ transitions, with the latter two being of similar magnitude. Good agreement is found between the HERMES proton data and results of a pQCD-inspired phenomenological model that includes pion-pole contributions, which are of unnatural parity.
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000170112 650_7 $$2INSPIRE$$apositron p: exclusive reaction
000170112 650_7 $$2INSPIRE$$aelectron p: exclusive reaction
000170112 650_7 $$2INSPIRE$$aelectron deuteron: exclusive reaction
000170112 650_7 $$2INSPIRE$$apolarized beam: longitudinal
000170112 650_7 $$2INSPIRE$$aomega(783): electroproduction
000170112 650_7 $$2INSPIRE$$aangular distribution
000170112 650_7 $$2INSPIRE$$across section: longitudinal
000170112 650_7 $$2INSPIRE$$across section: transverse
000170112 650_7 $$2INSPIRE$$across section: ratio
000170112 650_7 $$2INSPIRE$$aspin: density matrix
000170112 650_7 $$2INSPIRE$$ahelicity: amplitude analysis
000170112 650_7 $$2INSPIRE$$aquantum chromodynamics: perturbation theory
000170112 650_7 $$2INSPIRE$$api: pole
000170112 650_7 $$2INSPIRE$$aHERMES
000170112 650_7 $$2INSPIRE$$aexperimental results
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000170112 650_7 $$2INSPIRE$$a27.6 GeV
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000170112 7001_ $$0P:(DE-H253)PIP1007090$$aSchnell, Gunar$$b75$$eCorresponding Author
000170112 7001_ $$0P:(DE-H253)PIP1001545$$aSchüler, K. P.$$b76
000170112 7001_ $$0P:(DE-HGF)0$$aSeitz, B.$$b77
000170112 7001_ $$0P:(DE-HGF)0$$aShibata, T. -A.$$b78
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000170112 7001_ $$0P:(DE-HGF)0$$aSteijger, J. J. M.$$b83
000170112 7001_ $$0P:(DE-H253)PIP1004477$$aTaroian, S.$$b84
000170112 7001_ $$0P:(DE-HGF)0$$aTerkulov, A.$$b85
000170112 7001_ $$0P:(DE-HGF)0$$aTruty, R.$$b86
000170112 7001_ $$0P:(DE-HGF)0$$aTrzcinski, A.$$b87
000170112 7001_ $$0P:(DE-HGF)0$$aTytgat, M.$$b88
000170112 7001_ $$0P:(DE-HGF)0$$aVan Haarlem, Y.$$b89
000170112 7001_ $$0P:(DE-HGF)0$$aVan Hulse, C.$$b90
000170112 7001_ $$0P:(DE-HGF)0$$aVikhrov, V.$$b91
000170112 7001_ $$0P:(DE-HGF)0$$aVilardi, I.$$b92
000170112 7001_ $$0P:(DE-HGF)0$$aWang, S.$$b93
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000170112 7001_ $$0P:(DE-HGF)0$$aYen, S.$$b95
000170112 7001_ $$0P:(DE-HGF)0$$aZeiler, D.$$b96
000170112 7001_ $$0P:(DE-HGF)0$$aZihlmann, B.$$b97
000170112 7001_ $$0P:(DE-HGF)0$$aZupranski, P.$$b98
000170112 7001_ $$0P:(DE-HGF)0$$aHERMES Collaboration$$b99$$eCollaboration author
000170112 7870_ $$0PUBDB-2016-06719$$aAirapetian, A. et.al.$$dBerlin : Springer, 2016$$iIsMemberOf$$rDESY-14-116; arXiv:1407.2119$$tErratum to: Spin density matrix elements in exclusive $\mathrm{\omega}$ electroproduction on $\mathrm{^1H}$ and $\mathrm{^2H}$ targets at 27.5 GeV beam energy
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