Scalar and vector meson production and two-step processes in the (K-, K+) reaction on 12C

J. K. Ahn, S. Aoki, K. S. Chung, M. S. Chung, H. En'yo, T. Fukuda, H. Funahashi, Y. Goto, A. Higashi, M. Ieiri, T. Iijima, M. Iinuma, K. Imai, Y. Itow, J. M. Lee, S. Makino, A. Masaike, Y. Matsuda, Y. Matsuyama, S. MiharaC. Nagoshi, I. Nomura, I. S. Park, N. Saito, M. Sekimoto, Y. M. Shin, K. S. Sim, R. Susukita, R. Takashima, F. Takeutchi, P. Tlustý, S. Weibe, S. Yokkaichi, K. Yoshida, M. Yoshida, T. Yoshida, S. Yamashita

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17 Citations (Scopus)


The double strangeness exchange reaction (K-, K+) is investigated with respect to the sub-threshold production of scalar and vector mesons (f0/a0/φ) decaying into K+ K- and the two-step processes induced by intermediate mesons and Ξ- hyperons at pK- = 1.66 GeV/c using a scintillating fiber active target. The differential cross section ((dσ/dΩL)) averaged over the angular interval (2.30 ≤ θLK+ ≤ 14.70) for the sub-threshold f0/a0/φ meson production with the K+ K- decay is 11 ± 6 μb/sr at 0.6 ≤ pK+ < 0.95 GeV/c. The present result differs significantly from the theoretical calculation which predicts the contribution of the f0/a0/φ meson production to be predominant in the (K-, K+) reaction below pK+ = 0.95 GeV/c. We found a sizable contribution from two-step (K-, K+) processes, characterized by production of two S = - 1 hyperons, consistent with the result of the intra-nuclear cascade (INC) model calculation with respect to the meson-induced hyperon (or hyperon resonance) pair production in the momentum region 0.6 ≤ pK+ < 0.95 GeV/c. The observed enhancement of the cross section for the two-step ΛΛ production beyond the prediction of the INC model at pK+ ≃ 1.1 GeV/c could be due to the Ξ- p → ΛΛ reaction in 12C.

Original languageEnglish
Pages (from-to)231-250
Number of pages20
JournalNuclear Physics A
Issue number1-2
Publication statusPublished - 1997 Oct 27
Externally publishedYes


  • (K, K) reaction at p = 1.66 GeV/c
  • Quasi-free Ξ * production
  • Subthreshold f/a/φ meson production
  • Two-step process

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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