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19 April 2024

» arxiv » 1508.1483

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Photoproduction of {omega} Mesons off the Proton
A. Wilson ; V. Crede ; A. V. Anisovich ; J. C. S. Bacelar ; B. Bantes ; O. Bartholomy ; D. Bayadilov ; R. Beck ; Y. A. Beloglazov ; K. T. Brinkmann ; R. Castelijns ; H. Dutz ; D. Elsner ; R. Ewald ; F. Frommberger ; M. Fuchs ; Chr. Funke ; R. Gregor ; A. Gridnev ; E. Gutz ; J. Hannappel ; W. Hillert ; P. Hoffmeister ; I. Horn ; I. Jaegle ; T. Jude ; J. Junkersfeld ; H. Kalinowsky ; V. Kleber ; Frank Klein ; Friedrich Klein ; E. Klempt ; M. Kotulla ; B. Krusche ; M. Lang ; H. Löhner ; I. V. Lopatin ; S. Lugert ; T. Mertens ; J. G. Messchendorp ; V. Metag ; M. Nanova ; V. A. Nikonov ; D. Novinski ; R. Novotny ; M. Ostrick ; L. M. Pant ; H. van Pee ; M. Pfeiffer ; A. Roy ; A. V. Sarantsev ; C. Schmidt ; H. Schmieden ; S. Shende ; V. Sokhoyan ; N. Sparks ; A. Süle ; V. V. Sumachev ; T. Szczepanek ; U. Thoma ; D. Trnka ; R. Varma ; D. Walther ; Ch. Wendel ; U. Wiedner ; CBELSA/TAPS Collaboration ;
Date:	6 Aug 2015
Abstract:	The differential cross sections and unpolarized spin-density matrix elements for the reaction $gamma p o pomega$ were measured using the CBELSA/TAPS experiment for initial photon energies ranging from the reaction threshold to 2.5 GeV. These observables were measured from the radiative decay of the $omega$ meson, $omega opi^0gamma$. The cross sections cover the full angular range and show the full extent of the $t$-channel forward rise. The overall shape of the angular distributions in the differential cross sections and unpolarized spin-density matrix elements are in fair agreement with previous data. In addition, for the first time, a beam of linearly-polarized tagged photons in the energy range from 1150 MeV to 1650 MeV was used to extract polarized spin-density matrix elements. These data were included in the Bonn-Gatchina partial wave analysis (PWA). The dominant contribution to $omega$ photoproduction near threshold was found to be the $3/2^+$ partial wave, which is primarily due to the sub-threshold $N(1720),3/2^+$ resonance. At higher energies, pomeron-exchange was found to dominate whereas $pi$-exchange remained small. These $t$-channel contributions as well as further contributions from nucleon resonances were necessary to describe the entire dataset: the $1/2^-$, $3/2^-$, and $5/2^+$ partial waves were also found to contribute significantly.
Source:	arXiv, 1508.1483
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