Evidence for in-medium modification of the $ϕ$ meson at normal nuclear density

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dc.creatorMuto, R.
dc.creatorEn'yo, H.
dc.creatorNaruki, M.
dc.creatorTabaru, T.
dc.creatorYokkaichi, S.
dc.creatorChiba, J.
dc.creatorIeiri, M.
dc.creatorSasaki, O.
dc.creatorSekimoto, M.
dc.creatorTanaka, K. H.
dc.creatorFunahashi, H.
dc.creatorFukao, Y.
dc.creatorKitaguchi, M.
dc.creatorIshino, M.
dc.creatorKanda, H.
dc.creatorMihara, S.
dc.creatorMiyashita, T.
dc.creatorMiwa, K.
dc.creatorMurakami, T.
dc.creatorNakura, T.
dc.creatorSakuma, F.
dc.creatorTogawa, M.
dc.creatorYamada, S.
dc.creatorYoshimura, Y.
dc.creatorHamagaki, H.
dc.creatorOzawa, K.
dc.date2005-11-08
dc.date2007-01-30
dc.date.accessioned2026-07-07T11:44:17Z
dc.date.available2026-07-07T11:44:17Z
dc.descriptionInvariant mass spectra of e+e- pairs have been measured in 12 GeV p+A reactions to detect possible in-medium modification of vector mesons. Copper and carbon targets are used to study the nuclear-size dependence of e+e- invariant mass distributions. A significant excess on the low-mass side of the phi meson peak is observed in the low beta gamma (=beta/sqrt(1-beta^2)) region of phi mesons (beta gamma < 1.25) with copper targets. However, in the high beta gamma region (beta gamma > 1.25), spectral shapes of phi mesons are well described by the Breit-Wigner shape when experimental effects are considered. Thus, in addition to our earlier publication on rho / omega modification, this study has experimentally verified vector meson mass modification at normal nuclear density.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/nucl-ex/0511019
dc.identifierhttp://arxiv.org/abs/nucl-ex/0511019
dc.identifierPhys.Rev.Lett.98:042501,2007
dc.identifierdoi:10.1103/PhysRevLett.98.042501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201550
dc.subjectNuclear Experiment
dc.titleEvidence for in-medium modification of the $ϕ$ meson at normal nuclear density
dc.typetext

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