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Measurement of double polarisation asymmetries in $omega$-photoproduction
H. Eberhardt ; T. C. Jude ; H. Schmieden ; A.V. Anisovich ; B. Bantes ; D. Bayadilov ; R. Beck ; Yu. Beloglazov ; M. Bichow ; S. Boese ; K.-Th. Brinkmann ; Th. Challand ; V. Crede ; F. Diez ; P. Drexler ; H. Dutz ; D. Elsner ; R. Ewald ; K. Fornet-Ponse ; St. Friedrich ; F. Frommberger ; Ch. Funke ; M. Gottschall ; A. Gridnev ; M. Gruener ; E. Gutz ; Ch. Hammann ; J. Hannappel ; J. Hartmann ; W. Hillert ; Ph. Hoffmeister ; Ch. Honisch ; I. Jaegle ; D. Kaiser ; H. Kalinowsky ; F. Kalischewski ; S. Kammer ; I. Keshelashvili ; V. Kleber ; F. Klein ; E. Klempt ; K. Koop ; B. Krusche ; M. Kube ; M. Lang ; I. Lopatin ; Y. Maghrbi ; K. Makonyi ; V. Metag ; W. Meyer ; J. Mueller ; M. Nanova ; V. Nikonov ; R. Novotny ; D. Piontek ; S. Reeve ; G. Reicherz ; T. Rostomyan ; S. Runkel ; A. Sarantsev ; St. Schaepe ; Ch. Schmidt ; R. Schmitz ; T. Seifen ; V. Sokhoyan ; V. Sumachev ; A. Thiel ; U. Thoma ; M. Urban ; H. van Pee ; D. Walther ; Ch. Wendel ; U. Wiedner ; A. Wilson ; A. Winnebeck ;
Date:	9 Apr 2015
Abstract:	The first measurements of the beam-target-helicity-asymmetries $E$ and $G$ in the photoproduction of $omega$-mesons off protons at the CBELSA/TAPS experiment are reported. $E$ ($G$) was measured using circularly (linearly) polarised photons and a longitudinally polarised target. $E$ was measured over the photon energy range from close to threshold ($E_gamma = 1108$~MeV) to $E_gamma = 2300$~MeV and $G$ at a single energy interval of $1108 < E_gamma <1300$~MeV. Both measurements cover the full solid angle. The observables $E$ and $G$ are highly sensitive to the contribution of baryon resonances, with $E$ acting as a helicity filter in the $s$-channel. The new results indicate significant $s$-channel resonance contributions together with contributions from $t$-channel exchange processes. A partial wave analysis reveals strong contributions from the partial waves with spin-parity $J^P=3/2^+, 5/2^+$, and $3/2^-$.
Source:	arXiv, 1504.2221
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