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Observation of rho/omega meson modification in nuclear matter
K Ozawa1, H En'yo, H Funahashi
1Department of Physics, Kyoto University, Kitashirakawa Sakyo-Ku, Kyoto 606-8502, Japan.
Physical Review Letters
|June 1, 2001
Abstract:
We measured the invariant mass spectra of electron-positron pairs in the target rapidity region of 12-GeV p+A reactions. We have observed a significant difference in the mass spectra below the omega meson between p+C and p+Cu interactions. This difference indicates that the spectral shape of mesons is modified at normal nuclear-matter density.