Breaking of Line Reverse Relation and Exotics

概要

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Under a hypothesis that the meson-baryon reaction amplitude corresponds to the urbaryon rearrangement diagram (URD), the X type (t-u dual) URD is related to the H type (s-t dual) one in the forward region by reversing the urbaryon line. It has been taken that the X type amplitude has the magnitude equal to the H type one and is real, and that the Z type (s-u dual) amplitude is negligible; line reverse relation (LRR). There are, however, indications that the LRR is more of less broken. Two simple models resulting in the LR breaking under the URD hypothesis are investigated. (1) Z_<II> model. One of the three Z type URD's which is named Z_<II>, has a remarkable peculiarity that its t-channel quantum numbers are non-exotic irrespective of the exotic four-urbaryon configuration. If the Z_<II> amplitude survives up to high energies from this peculiarity, an apparent LR breaking results in K^^-N→πY vs. πN→KY processes. (2) Im X model. The imaginary part of the X amplitude, which may be compatible with the possible KN s-channel exotics such as Z_0(P_<1/2>) and Z_1(P_<3/2>), gives rise to an intrinsic LR breaking. A comparison between the two models and their consequences are examined. LR breakings in decuplet baryon production and of baryon exchange are also discussed.
理論物理学刊行会の論文
1974-09-25