Coherent production of multimeson final states on A ∼ 20 nuclei by K− of 5.5, 10.0, 12.7 GeV |
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Authors: | HH Bingham CW Farwell WB Fretter GM Irwin S Kahn A Lu B Daugeras D Fournier J Hennessy M Novak JJ Veillet AM Cnops FR Huson RI Louttit DJ Miller JS ONeall M Di Carato M Rollier J Ginestet |
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Institution: | Laboratoire de l''Accelérateur Linéaire, 91 Orsay, France;Istituto de Fisica and Sezione Istituto Nazionale de Fisica Nucleare, Milano, Italy;Centre d''Etudes Nucléaire de Saclay, 91-Gif-Sur-Yvette, France |
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Abstract: | Coherent production of 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 production occurs (although forbidden via 0+ exchange) and is dominated by the 1 (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 1 (890) are produced on single nucleons by exchange of isoscalar trajectories of natural parity (JP = 1?, 2+, etc.) and that the 1 (890) absorption in nuclear matter equals that of the K?. Coherent production (allowed via 0+, 1?, 2+, etc. exchange) is dominated by the Q phenomenon. A Dalitz plot and angular correlation analysis yields values for fractions, and shows that 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 ? -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 ω. The ration coherently produced in the Q mass region is (4 ± 1)%. Coherent production of is observed in the L region. Coherent production is not observed in the K4π channels. |
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