Modification of the omega-meson lifetime in nuclear matter

Modification of the omega-meson lifetime in nuclear matter

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 numb...

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Veröffentlicht in:Physical review letters 2008-05, Vol.100 (19), p.192302-192302, Article 192302
Hauptverfasser: Kotulla, M, Trnka, D, Mühlich, P, Anton, G, Bacelar, J C S, Bartholomy, O, Bayadilov, D, Beloglazov, Y A, Bogendörfer, R, Castelijns, R, Crede, V, Dutz, H, Ehmanns, A, Elsner, D, Ewald, R, Fabry, I, Fuchs, M, Essig, K, Funke, Ch, Gothe, R, Gregor, R, Gridnev, A B, Gutz, E, Höffgen, S, Hoffmeister, P, Horn, I, Hössl, J, Jaegle, I, Junkersfeld, J, Kalinowsky, H, Klein, Frank, Klein, Fritz, 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, van Pee, H, Pfeiffer, M, Roy, A, Radkov, A, Schadmand, S, Schmidt, Ch, Schmieden, H, Schoch, B, Shende, S, Suft, G, Sumachev, V V, Szczepanek, T, Süle, A, Thoma, U, Varma, R, Walther, D, Weinheimer, Ch, Wendel, Ch
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Sprache:eng
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Zusammenfassung: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/c(2) 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 approximately 30. For the first time, the momentum dependent omegaN cross section has been extracted from the experiment and is in the range of 70 mb.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.100.192302