Observation of in-medium modifications of the omega meson.

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 gamma+A -<omega+X -<pi(0)gamma+X-`. Results obtained for Nb are compared to a reference measurement on a LH2 target. While for recoiling, long-lived mesons (pi(0), eta, and eta(`)), which decay outside of the nucleus, a difference in the line shape for the two data samples is not observed, we find a significant enhancement towards lower masses for omega mesons produced on the Nb target. For momenta less than 500 MeV/c an in-medium omega meson mass of M-medium=[722(-4)(+4)(stat)(-5)(+35)(syst)] MeV/c(2) has been deduced at an estimated average nuclear density of 0.6 rho(0).

• Publication year

  2005

• Venue

  Physical Review Letters

• Publication date

  2005-04-12

• Fields of study

  Physics

• Identifiers
  DOI 10.1103/PhysRevLett.94.192303arXiv nucl-ex/0504010
• External record

  Open on Semantic Scholar

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  Semantic Scholar

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• No concepts are published for this paper.

• No references are available for this paper.

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