Medium modification of vector mesons observed in 12 GeV p+A reactions

M. Naruki, H. En'Yo, R. Muto, T. Tabaru, S. Yokkaichi, Y. Fukao, H. Funahashi, M. Ishino, H. Kanda, M. Kitaguchi, S. Mihara, K. Miwa, T. Miyashita, T. Murakami, T. Nakura, F. Sakuma, M. Togawa, S. Yamada, Y. Yoshimura, J. ChibaM. Ieiri, O. Sasaki, M. Sekimoto, K. H. Tanaka, H. Hamagaki, K. Ozawa

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3 Citations (Scopus)


The invariant mass spectra of e+e- pairs produced in 12 GeV p+A reactions are measured at the KEK Proton Synchrotron. We observed a significant enhancement over the known hadronic sources on the low-mass side of the ω meson peak for C and Cu data. The 95% CL allowed parameter regions for ρ/ω ratio are obtained as ρ/ω< 0.15 and ρ/ω< 0.31 for C and Cu targets, respectively. As for the meson, the data obtained with a Cu target revealed a significant excess on the low-mass side of the meson peak mainly in the βγ < 1.25 region.

Original languageEnglish
Article numberS156
Pages (from-to)S1059-S1063
JournalJournal of Physics G: Nuclear and Particle Physics
Issue number8
Publication statusPublished - 2007 Aug 1


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