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Modification of the omega-meson lifetime in nuclear matter

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

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Physical review letters 100 (2008), Nr.19, Art. 192302, 5 S.
ISSN: 0031-9007
ISSN: 1079-7114
Englisch
Zeitschriftenaufsatz
Fraunhofer INT ()

Abstract
Information on hadron properties in the nuclear medium has been derived from the photoproduction of omega mesons on the nuclei C, Ca, Nb, and Pb using the Crystal Barrel/TAPS detector at the ELSA tagged photon facility in Bonn. The dependence of the omega-meson cross section on the nuclear mass number has been compared with three different types of models: a Glauber analysis, a Boltzmann-Uehling-Uhlenbeck analysis of the Giessen theory group, and a calculation by the Valencia theory group. In all three cases, the inelastic omega width is found to be 130-150 MeV / c2 at normal nuclear matter density for an average 3- momentum of 1.1 GeV / c. In the rest frame of the omega meson, this inelastic omega width corresponds to a reduction of the omega lifetime by a factor = 30. For the first time, the momentum dependent omega-Ni cross section has been extracted from the experiment and is in the range of 70 mb.

: http://publica.fraunhofer.de/dokumente/N-192516.html