Observation of rho / ω Meson Modification in Nuclear Matter

K. Ozawa , H. En'yo , H. Funahashi , M. Kitaguchi , M. Ishino , H. Kanda , S. Mihara , T. Miyashita

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T. Murakami R. Muto M. Naruki F.Sakuma H. D. Sato T. Tabaru S. Yamada S. Yokkaichi Y. Yoshimura J. Chiba M. Ieiri M. Nomachi O. Sasaki M. Sekimoto K. H. Tanaka H. Hamagaki

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classification ⚛️ nucl-ex

keywords omegadifferencemassmesonmodificationspectrabelowdensity

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We have measured invariant mass spectra of electron-positron pairs in the target rapidity region of 12GeV p+A reactions. We have observed a significant difference in the mass spectra below the $\omega$ meson between p+C and p+Cu interactions. The difference is interpreted as a signature of the $\rho/\omega$ modification at normal nuclear-matter density.

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Observation of rho / ω Meson Modification in Nuclear Matter

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