Nuclear-matter modification of decay widths in the $ϕ\to e^{+}e^{-}$ and $ϕ\to K^{+}K^{-}$ channels

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dc.creatorSakuma, F.
dc.creatorChiba, J.
dc.creatorEn'yo, H.
dc.creatorFukao, Y.
dc.creatorFunahashi, H.
dc.creatorHamagaki, H.
dc.creatorIeiri, M.
dc.creatorIshino, M.
dc.creatorKanda, H.
dc.creatorKitaguchi, M.
dc.creatorMihara, S.
dc.creatorMiwa, K.
dc.creatorMiyashita, T.
dc.creatorMurakami, T.
dc.creatorMuto, R.
dc.creatorNakura, T.
dc.creatorNaruki, M.
dc.creatorOzawa, K.
dc.creatorSasaki, O.
dc.creatorSekimoto, M.
dc.creatorTabaru, T.
dc.creatorTanaka, K. H.
dc.creatorTogawa, M.
dc.creatorYamada, S.
dc.creatorYokkaichi, S.
dc.creatorYoshimura, Y.
dc.date2006-06-23
dc.date2007-04-14
dc.date.accessioned2026-07-07T11:44:18Z
dc.date.available2026-07-07T11:44:18Z
dc.descriptionThe invariant mass spectra of $ϕ\to K^{+}K^{-}$ are measured in 12 GeV $p+A$ reactions in order to search for the in-medium modification of $ϕ$ mesons. The observed $K^{+}K^{-}$ spectra are well reproduced by the relativistic Breit-Wigner function with a combinatorial background shape in three $βγ$ regions between 1.0 and 3.5. The nuclear mass-number dependence of the yields of the $K^{+}K^{-}$ decay channel is compared to the simultaneously measured $e^{+}e^{-}$ decay channel for carbon and copper targets. We parameterize the production yields as $σ(A) = σ_0 \times A^α$ and obtain $α_{ϕ\to K^+K^-} - α_{ϕ\to e^+e^-}$ to be 0.14 $\pm$ 0.12. Limits are obtained for the partial decay widths of $ϕ$ mesons in nuclear matter.
dc.description5 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/nucl-ex/0606029
dc.identifierhttp://arxiv.org/abs/nucl-ex/0606029
dc.identifierPhys.Rev.Lett.98:152302,2007
dc.identifierdoi:10.1103/PhysRevLett.98.152302
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201552
dc.subjectNuclear Experiment
dc.titleNuclear-matter modification of decay widths in the $ϕ\to e^{+}e^{-}$ and $ϕ\to K^{+}K^{-}$ channels
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