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Modification of the $omega$-Meson Lifetime in Nuclear Matter
M. Kotulla ; D. Trnka ; P. Mühlich ; 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 ; R. Ewald ; I. Fabry ; M. Fuchs ; K. Essig ; 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 ; Fritz Klein ; E. Klempt ; M. Konrad ; B. Kopf ; B. Krusche ; J. Langheinrich ; H. Löhner ; I.V. Lopatin ; J. Lotz ; S. Lugert ; D. Menze ; J. G. Messchendorp ; T. Mertens ; V. Metag ; U. Mosel ; M. Nanova ; 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 ; V. V. Sumachev ; T. Szczepanek ; A. Süle ; U. Thoma ;
Date:	7 Feb 2008
Abstract:	The photo production of $omega$ mesons on the nuclei C, Ca, Nb and Pb has been measured 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 BUU 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 $130-150 m{MeV/c^2}$ at normal nuclear matter density for an average 3-momentum of 1.1 GeV/c. In the restframe of the $omega$ meson, this inelastic $omega$ width corresponds to a reduction of the $omega$ lifetime by a factor $approx 30$. 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.
Source:	arXiv, 0802.0989
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