Elsevier

Nuclear Physics B

Volume 52, Issue 1, 15 January 1973, Pages 31-69
Nuclear Physics B

Coherent production of multimeson final states on A ∼ 20 nuclei by K of 5.5, 10.0, 12.7 GeV

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Abstract

Coherent production of Kπ, Kand K final states from A ∼ 20 nuclei by K beams of 5.5, 10.0 and 12.7 GeV is analyzed. Final states with ⩽ 2πO are included. Coherent Kπ production occurs (although forbidden via 0+ exchange) and is dominated by the K (890). The shape of the t distribution, the alignment of the produced meson and the ratio of the cross section on nuclei to that on hydrogen are consistent with optical model predictions assuming that K (890) are produced on single nucleons by exchange of isoscalar trajectories of natural parity (JP = 1, 2+, etc.) and that the K (890) absorption in nuclear matter equals that of the K. Coherent Kππ production (allowed via 0+, 1, 2+, etc. exchange) is dominated by the Q phenomenon. A Dalitz plot and angular correlation analysis yields values for Kϱ/Kπ fractions, and shows that JP = 1+ S-wave Kπ dominates the coherently produced Q. The helicity of the Q is found to be compatible with 0. The Q -nucleaon total cross section is estimated to be 0.98−0.37+024 times the K -nucleon total cross section from a comparison of the coherent Q-production cross section with corresponding hydrogen cross sections at 10 and 12.7 GeV. We observe coherent production of Kω. The ration Kω/Kππ coherently produced in the Q mass region is (4 ± 1)%. Coherent production of Kπ+π and KOπ+π πO is observed in the L region. Coherent production is not observed in the K4π channels.

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  • Supported in part by National Science Foundation.

    Institut de Physique, Prague 8, Czechoslovakia.

    ∗∗

    Supported in part by U.S. Atomic Energy Commission.

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