Modification of the omega-meson lifetime in nuclear matter

作者：Kotulla M^*; Trnka D; Muehlich P; Anton G; Bacelar J C S; Bartholomy O; Bayadilov D; Beloglazov Y A; Bogendoerfer 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; Hoeffgen S; Hoffmeister P; Horn I; Hoessl J; Jaegle I; Junkersfeld J; Kalinowsky H; Klein Frank; Klein Fritz; Klempt E; Konrad M; Kopf B; Krusche B; Langheinrich J

来源：Physical Review Letters, 2008, 100(19): 192302.

DOI：10.1103/PhysRevLett.100.192302

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 approximate to 30. For the first time, the momentum dependent omega N cross section has been extracted from the experiment and is in the range of 70 mb.

• 出版日期2008-5-16