Photoproduction of omega mesons off protons and neutrons
Date Issued
2015-01-01
Author(s)
Dietz, F.
Metag, V.
Anisovich, A. V.
Bacelar, J. C. S.
Bantes, B.
Bartholomy, O.
Bayadilov, D. E.
Beck, R.
Belogazov, Y. A.
Castelijns, R.
Crede, V.
Dutz, H.
Elsner, D.
Ewald, R.
Frommberger, F.
Funke, C.
Gothe, R.
Gregor, R.
Gridnev, A. B.
Gutz, E.
Hillert, W.
Hoeffgren, S.
Hoffmeister, P.
Horn, I.
Jaegle, I.
Junkersfeld, J.
Kalinowsky, H.
Kammer, S.
Kleber, V.
Klein, Frank
Klein, Friedrich
Klempt, E.
Konrad, M.
Kotulla, M.
Lang, M.
Lohner, H.
Lopatin, I. V.
Lugert, S.
Menze, D.
Mertens, T.
Messchendorp, J. G.
Nikonov, V. A.
Nanova, M.
Novinski, D. V.
Novotny, R.
Ostrick, M.
Pant, L. M.
van Pee, H.
Pfeiffer, M.
Rostomyan, T.
Roy, A.
Schadmand, S.
Schmidt, C.
Schmieden, H.
Schoch, B.
Shende, S. V.
Shklyar, V.
Suele, A.
Sumachev, V. V.
Szczepanek, T.
Thoma, U.
Trnka, D.
Varma, R.
Walter, D.
Wendel, C.
Wilson, A.
CBELSA, TAPS Collaboration
DOI
10.1140/epja/i2015-15006-3
Abstract
Omega photoproduction off hydrogen and deuterium has been studied with the tagged photon beam of the ELSA accelerator in Bonn for photon energies up to 2.0 GeV. The omega meson has been identified via the omega -> pi(0) gamma -> gamma gamma gamma decay mode, using the combined setup of the Crystal Barrel/TAPS detector systems. Both inclusive and exclusive analyses have been carried out. Differential and total cross-sections have been derived for omega mesons produced off free protons and off protons and neutrons bound in deuterium. The cross-section for the production off the bound neutron is found to be a factor of a parts per thousand 1.3 larger than the one off the bound proton in the incident beam energy region 1.2 GeV < E (gamma) < 1.6 GeV. For higher incident beam energies this factor goes down to a parts per thousand 1.1 at 2.0 GeV. The cross-sections of this work have been used as normalization for transparency ratio measurements.