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Invited TalksNo Access

STUDY OF IN-MEDIUM MESON MODIFICATION IN 12 GeV p + A REACTIONS

KEK–PS E325 COLLABORATION.

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RIKEN, 2–1, Hirosawa, Wako, Saitama 351-0198, Japan

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RIKEN, 2–1, Hirosawa, Wako, Saitama 351-0198, Japan

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RIKEN, 2–1, Hirosawa, Wako, Saitama 351-0198, Japan

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RIKEN, 2–1, Hirosawa, Wako, Saitama 351-0198, Japan

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RIKEN, 2–1, Hirosawa, Wako, Saitama 351-0198, Japan

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IPNS, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

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IPNS, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

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IPNS, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

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IPNS, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

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IPNS, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan

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Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan

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Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan

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https://doi.org/10.1142/S0217751X07035586Cited by:1 (Source: Crossref)

Abstract

Invariant mass spectra of low-mass vector mesons in the e⁺e^- channel are measured in 12 GeV p + C and p + Cu reactions at the KEK Proton Synchrotron. Significant excess is observed at the low-mass side of ω meson peak over the known hadronic sources both in the C and Cu target data. Also below the ϕ meson peak, an excess is found in the Cu target data for slowly moving mesons whose βγ is less than 1.25. They can be interpreted as signatures of the spectral modification of vector mesons in cold nuclear matter.

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Vol. 22, No. 02n03

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