Observation of in-medium modifications of the ω meson

Trnka, D. and Anton, G. and Bacelar, J. C. S. and Bartholomy, O. and Bayadilov, D. and Beloglazov, Y. A. and Bogendorfer, R. and Castelijns, R. and Crede, V. and Dutz, H. and Ehmanns, A. and Elsner, D. and Ewald, R. and Fabry, I. and Fuchs, M. and Essig, K. and Funke, C. and Gothe, R. and Gregor, R. and Gridnev, A. B. and Gutz, E. and Hoffgen, S. and Hoffmeister, P. and Horn, I. and Hossl, J. and Jaegle, I. and Junkersfeld, J. and Kalinowsky, H. and Klein, F. and Klein, F. and Klempt, E. and Konrad, M. and Kopf, B. and Kotulla, M. and Krusche, B. and Langheinrich, J. and Lohner, H. and Lopatin, I. V. and Lotz, J. and Lugert, S. and Menze, D. and Messchendorp, J. G. and Mertens, T. and Metag, V. and Morales, C. and Nanova, M. and Novotny, R. and Ostrick, M. and Pant, L. M. and van Pee, H. and Pfeiffer, M. and Roy, A. and Radkov, A. and Schadmand, S. and Schmidt, C. and Schmieden, H. and Schoch, B. and Shende, S. and Suft, G. and Sumachev, V. V. and Szczepanek, T. and Sule, A. and Thoma, U. and Varma, R. and Walther, D. and Weinheimer, C. and Wendel, C.. (2005) Observation of in-medium modifications of the ω meson. Physical review letters, Vol. 94, H. 19 , 192303, 4 S..

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Official URL: http://edoc.unibas.ch/dok/A5261939

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The photoproduction of omega mesons on nuclei has been investigated using the Crystal Barrel/TAPS experiment at the ELSA tagged photon facility in Bonn. The aim is to study possible in-medium modifications of the omega meson via the reaction gamma+A -<omega+X -<pi(0)gamma+X-`. Results obtained for Nb are compared to a reference measurement on a LH2 target. While for recoiling, long-lived mesons (pi(0), eta, and eta(`)), which decay outside of the nucleus, a difference in the line shape for the two data samples is not observed, we find a significant enhancement towards lower masses for omega mesons produced on the Nb target. For momenta less than 500 MeV/c an in-medium omega meson mass of M-medium=[722(-4)(+4)(stat)(-5)(+35)(syst)] MeV/c(2) has been deduced at an estimated average nuclear density of 0.6 rho(0).
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Variant title: Observation of in-medium modifications of the omega meson -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:53

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