First observation of in-medium modifications of the omega meson

Details First observation of in-medium modifications of the omega meson First observation of in-medium modifications of the omega meson

2005-04-12

arxiv.org/abs/nucl-ex/0504010v2

Phys.Rev.Lett. 94 (2005) 192303

Physics

Nuclear Physics

Nuclear Experiment

Latex, 4 pages, 4 figures, accepted by Phys. Rev. Lett; references re-arranged, now references in chronological order in first

Scientific paper

10.1103/PhysRevLett.94.192303

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 A(gamma, omega)X. Results obtained for Nb are compared to a reference measurement on a liquid hydrogen target. While for recoiling, long-lived mesons (pi, eta and etaprime), which decay outside of the nucleus, a difference in the lineshape for the two data samples is not observed, we find a significant enhancement towards lower masses for omega mesons with low momenta produced on the Nb target.

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