First observation of ϕ-meson mass modifi
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R. Muto; J. Chiba; H. En'yo; Y. Fukao; H. Funahashi; H. Hamagaki; M. Ieiri; M. I
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Article
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2006
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Elsevier Science
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English
⚖ 218 KB
We have measured e + e -invariant mass spectra in 12 GeV p + A interactions at the KEK Proton-Synchrotron. The aim of the experiment is to detect possible in-medium modification of vector mesons at normal nuclear density. We used carbon and copper targets to study the nuclear size dependence of the