Photoproduction of ω mesons on nuclei near the production threshold

M. Nanova , J. Weil , S. Friedrich , V. Metag , U. Mosel , G. Anton , J.C.S. Bacelar , O. Bartholomy

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D. Bayadilov Y.A. Beloglazov R. Bogend\"orfer 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. H\"offgen P. Hoffmeister I. Horn J. H\"ossl I. Jaegle J. Junkersfeld H. Kalinowsky Frank Klein Friedrich Klein E. Klempt M. Konrad B. Kopf M. Kotulla B. Krusche J. Langheinrich H. L\"ohner 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. S\"ule V.V. Sumachev T. Szczepanek U. Thoma D. Trnka R. Varma D. Walther Ch. Weinheimer Ch. Wendel

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keywords omegalinemesonsnearphotoproductionproductionshapethreshold

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The photoproduction of $\omega$ mesons on LH_2, C and Nb has been studied for incident photon energies from 900 to 1300 MeV using the CB/TAPS detector at ELSA. The $\omega$ line shape does not show any significant difference between the LH_2 and the Nb targets. The data are compared with results of transport calculations that predict a sensitivity of the $\omega$ line shape to in-medium modifications near the production threshold on a free nucleon of $E_{\gamma}^{lab}$ = 1109 MeV.}

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Photoproduction of ω mesons on nuclei near the production threshold

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