title: Observation of rho/omega meson modification in nuclear matter.
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.
authors.affiliation: Department of Physics, Kyoto University, Kitashirakawa Sakyo-Ku, Kyoto 606-8502, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ozawa
authors.forename: H
authors.initials: H
authors.lastname: En'yo
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authors.initials: H
authors.lastname: Funahashi
authors.forename: M
authors.initials: M
authors.lastname: Kitaguchi
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authors.initials: M
authors.lastname: Ishino
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authors.lastname: Kanda
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authors.initials: S
authors.lastname: Mihara
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authors.lastname: Miyashita
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authors.lastname: Murakami
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authors.lastname: Muto
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authors.lastname: Naruki
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authors.lastname: Sakuma
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authors.initials: HD
authors.lastname: Sato
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authors.initials: T
authors.lastname: Tabaru
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authors.lastname: Yamada
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authors.lastname: Yokkaichi
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authors.lastname: Yoshimura
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authors.lastname: Chiba
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authors.lastname: Ieiri
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authors.lastname: Nomachi
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authors.lastname: Sasaki
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authors.lastname: Sekimoto
authors.forename: K H
authors.initials: KH
authors.lastname: Tanaka
authors.forename: H
authors.initials: H
authors.lastname: Hamagaki