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Observation of $ρ/ ω$ Meson Modification in Nuclear Matter

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

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 $ω$ meson between p+C and p+Cu interactions. The difference is interpreted as a signature of the $ρ/ω$ modification at normal nuclear-matter density.

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K. Ozawa, H. En'yo, H. Funahashi, M. Kitaguchi, M. Ishino, H. Kanda, S. Mihara, T. Miyashita, 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. 2000-11-21. Observation of $ρ/ ω$ Meson Modification in Nuclear Matter. https://doi.org/10.1103/physrevlett.86.5019

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