Enhanced Λ Λ production near threshold in the 12C(K-, K+) reaction KEK-PS E224 Collaboration

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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52 Citations (Scopus)


Enhanced production of Λ Λ pairs, above levels predicted by a two-step process model, has been observed near threshold (in the mass range 2.23-2.26 GeV/c2) in the 12C(K-, K+) reaction at 1.66 GeV/c using a scintillating fiber target. The differential cross section for Λ Λ production in the momentum region 0.95 ≤ pK+ ≤ 1.3 GeV/c averaged over the range 2.3° ≤ θK+ ≤ 14.7° was found to be 7.6 ± 1.3 ± 0.9 μb/sr, and that for the enhancement was found to be approximately 3 μb/sr.

Original languageEnglish
Pages (from-to)267-272
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
Publication statusPublished - 1998 Dec 24
Externally publishedYes

Bibliographical note

Funding Information:
We would like to thank the staff of the KEK proton synchrotron for their continuous support. We also thank Y. Akaishi, D.J. Millener and A. Ohnishi for valuable discussions. This work was supported in part by a Grant-in-Aid for Scientific Research (02402008), the Ministry of Science, Culture and Education, Japan, and the Basic Science Research Institute Program (BSRI-97-2408), Ministry of Education, Republic of Korea.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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