Photoproduction of mesons on nuclei near the production threshold

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

doi:10.1140/epja/i2011-11016-5

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

The CBELSA/TAPS Collaboration
M. Nanova¹^*, J. Weil², S. Friedrich¹, V. Metag¹, U. Mosel², M. Thiel¹, G. Anton³, J.C.S. Bacelar⁴, O. Bartholomy⁵, D. Bayadilov⁵^,6, Y.A. Beloglazov⁶, R. Bogendörfer³, R. Castelijns⁴, V. Crede⁵, H. Dutz⁷, A. Ehmanns⁵, D. Elsner⁷, K. Essig⁵, R. Ewald⁷, I. Fabry⁵, M. Fuchs⁵, Ch. Funke⁵, R. Gothe⁷, R. Gregor¹, A.B. Gridnev⁶, E. Gutz⁵, S. Höffgen⁵, P. Hoffmeister⁵, I. Horn⁵, J. Hössl³, I. Jaegle⁸, J. Junkersfeld⁵, H. Kalinowsky⁵, Frank Klein⁷, Friedrich Klein⁷, E. Klempt⁵, M. Konrad⁷, B. Kopf⁹^,10, M. Kotulla¹, B. Krusche⁸, J. Langheinrich⁷^,10, H. Löhner⁴, I.V. Lopatin⁶, J. Lotz⁵, S. Lugert¹, D. Menze⁷, T. Mertens⁸, J.G. Messchendorp⁴, C. Morales⁷, R. Novotny¹, M. Ostrick⁷, L.M. Pant¹, H. van Pee⁵, M. Pfeiffer¹, A. Roy¹, A. Radkov⁶, S. Schadmand¹, Ch. Schmidt⁵, H. Schmieden⁷, B. Schoch⁷, S. Shende⁴, G. Suft³, A. Süle⁷, V.V. Sumachev⁶, T. Szczepanek⁵, U. Thoma⁵, D. Trnka¹, R. Varma¹, D. Walther⁵, Ch. Weinheimer⁵ and Ch. Wendel⁵

¹ II. Physikalisches Institut, Universität Gießen, Gießen, Germany
² Institut für Theoretische Physik I, Universität Gießen, Gießen, Germany
³ Physikalisches Institut, Universität Erlangen, Erlangen, Germany
⁴ Kernfysisch Versneller Institut, Groningen, The Netherlands
⁵ Helmholtz-Institut für Strahlen- und Kernphysik Universität Bonn, Bonn, Germany
⁶ Petersburg Nuclear Physics Institute, Gatchina, Russia
⁷ Physikalisches Institut, Universität Bonn, Bonn, Germany
⁸ Physikalisches Institut, Universität Basel, Basel, Switzerland
⁹ Institut für Kern- und Teilchenphysik, TU Dresden, Dresden, Germany
¹⁰ Physikalisches Institut, Universität Bochum, Bochum, Germany

Received: 24 August 2010
Accepted: 15 December 2010
Published online: 1 February 2011

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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Photoproduction of mesons on nuclei near the production threshold

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