Photoproduction of $ \omega$ mesons on nuclei near the production threshold

The CBELSA/TAPS Collaboration,M. Nanova,J. Weil,S. Friedrich,V. Metag,U. Mosel, M. Thiel,G. Anton,J. C. S. Bacelar,O. Bartholomy,D. Bayadilov,Y. A. Beloglazov,R. Bogendörfer,R. Castelijns,V. Crede,H. Dutz,A. Ehmanns,D. Elsner,K. Essig,R. Ewald,I. Fabry,M. Fuchs,Ch. Funke,R. Gothe,R. Gregor,A. B. Gridnev,E. Gutz,S. Höffgen,P. Hoffmeister,I. Horn,J. Hössl,I. Jaegle,J. Junkersfeld,H. Kalinowsky,Frank Klein,Friedrich Klein,E. Klempt,M. Konrad,B. Kopf,M. Kotulla,B. Krusche,J. Langheinrich,H. Löhner,I. V. Lopatin,J. Lotz,S. Lugert,D. Menze,T. Mertens,J. G. Messchendorp,C. Morales,R. Novotny,M. Ostrick,L. M. Pant,H. van Pee,M. Pfeiffer,A. Roy,A. Radkov,S. Schadmand,Ch. Schmidt,H. Schmieden,B. Schoch,S. Shende,G. Suft,A. Süle,V. V. Sumachev,T. Szczepanek,U. Thoma,D. Trnka,R. Varma,D. Walther,Ch. Weinheimer,Ch. Wendel

EUROPEAN PHYSICAL JOURNAL A（2011）

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Abstract

The photoproduction of $ \omega$ mesons on LH2 , C and Nb has been measured for incident photon energies from 900 to 1300MeV using the CB/TAPS detector at ELSA. The $ \omega$ lineshape does not show any significant difference between the LH2 and the Nb targets. The experiment was motivated by transport calculations that predicted a sensitivity of the $ \omega$ lineshape to in-medium modifications near the production threshold on a free nucleon of $\ensuremath{E_{\gamma}^{lab}=1109}$ MeV. A comparison with recent calculations is given.

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Key words

Spectral Function,Current Address,Mass Shift,Incident Photon Energy,Production Threshold

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