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Photoproduction of omega mesons off the proton

Wilson, A. and Crede, V. and Anisovich, A. V. and Bacelar, J. C. S. and Bantes, B. and Bartholomy, O. and Bayadilov, D. and Beck, R. and Beloglazov, Y. A. and Brinkmann, K. T. and Castelijns, R. and Dutz, H. and Elsner, D. and Ewald, R. and Frommberger, F. and Fuchs, M. and Funke, Chr. and Gregor, R. and Gridnev, A. and Gutz, E. and Hannappel, J. and Hillert, W. and Hoffmeister, P. and Horn, I. and Jaegle, I. and Jude, T. and Junkersfeld, J. and Kalinowsky, H. and Kleber, V. and Klein, Frank and Klein, Friedrich and Klempt, E. and Kotulla, M. and Krusche, B. and Lang, M. and Loehner, H. and Lopatin, I. V. and Lugert, S. and Mertens, T. and Messchendorp, J. G. and Metag, V. and Nanova, M. and Nikonov, V. A. and Novinski, D. and Novotny, R. and Ostrick, M. and Pant, L. M. and van Pee, H. and Pfeiffer, M. and Roy, A. and Sarantsev, A. V. and Schmidt, C. and Schmieden, H. and Shende, S. and Sokhoyan, V. and Sparks, N. and Suele, A. and Sumachev, V. V. and Szczepanek, T. and Thoma, U. and Trnka, D. and Varma, R. and Walther, D. and Wendel, Ch. and Wiedner, U.. (2015) Photoproduction of omega mesons off the proton. Physics letters B, 749. pp. 407-413.

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Official URL: http://edoc.unibas.ch/40405/

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Abstract

The differential cross sections and unpolarized spin-density matrix elements for the reaction gamma rho -> rho omega were measured using the CBELSA/TAPS experiment for initial photon energies ranging from the reaction threshold to 2.5GeV. These observables were measured from the radiative decay of the omega meson, omega -> pi(0)gamma. 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, abeam 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. (C) 2015 The Authors. Published by Elsevier B.V.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier B.V.
ISSN:0370-2693
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:01
Deposited On:09 May 2016 09:08

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