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Adeva, B; Afanasyev, L; Allkofer, Y; Amsler, C; Anania, A; Aogaki, S; Benelli, A; Brekhovskikh, V; Cechak, T; Chiba, M; Chliapnikov, P; Doskarova, P; Drijard, D; Dudarev, A; Dumitriu, D; Fluerasu, D; Gorin, A; Gorchakov, O; Gritsay, K; Guaraldo, C; Gugiu, M; Hansroul, M; Hons, Z; Horikawa, S; Iwashita, Y; Karpukhin, V; Kluson, J; Kobayashi, M; Kruglov, V; Kruglova, L; Kulikov, A; Kulish, E; Kuptsov, A; Lamberto, A; Lanaro, A; Lednicky, R; Mariñas, C; Martincik, J; Nemenov, L; Nikitin, M; Okada, K; Olchevskii, V; Pentia, M; Penzo, A; Plo, M; Prusa, P; Rappazzo, G; Romero Vidal, A; Ryazantsev, A; Rykalin, V; Saborido, J; Schacher, J; Sidorov, A; Smolik, J; Takeutchi, F; Tauscher, L; Trojek, T; Trusov, S; Urban, T; Vrba, T; Yazkov, V; Yoshimura, Y; Zhabitsky, M; Zrelov, P
Physical review letters, 2016-Sep-09, Letnik: 117, Številka: 11Journal Article
The observation of hydrogenlike πK atoms, consisting of π^{-}K^{+} or π^{+}K^{-} mesons, is presented. The atoms are produced by 24 GeV/c protons from the CERN PS accelerator, interacting with platinum or nickel foil targets. The breakup (ionization) of πK atoms in the same targets yields characteristic πK pairs, called "atomic pairs," with small relative momenta Q in the pair center-of-mass system. The upgraded DIRAC experiment observed 349±62 such atomic πK pairs, corresponding to a signal of 5.6 standard deviations. This is the first statistically significant observation of the strange dimesonic πK atom.
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in: SICRIS
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