Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-07-11
Nucl.Phys. A712 (2002) 110-130
Physics
Nuclear Physics
Nuclear Theory
11 pages and 10 figures
Scientific paper
10.1016/S0375-9474(02)01271-X
Using a gauged flavor SU(3) invariant hadronic Lagrangian, we study $\Xi$ production from $\bar K$ induced reactions on $\Lambda$ and $\Sigma$ in a coupled-channel approach. Including the four channels of $\bar K\Lambda$, $\bar K\Sigma$, $\pi\Xi$, and $\eta\Xi$, we solve the Bethe-Salpeter equation in the $K$-matrix approximation by neglecting the off-shell contribution in the intermediate states. For the transition potential which drives the higher-order contribution, we consider all allowed Born diagrams in the $s$, $t$, and $u$ channels. With coupling constants determined from the SU(3) symmetry with empirical input, we find that the cross sections for the reactions $\bar K\Lambda\to\pi\Xi$, $\bar K\Sigma\to\pi\Xi$, $\bar K\Lambda\to\eta\Xi$, and $\bar K\Sigma\to\eta\Xi$ all have values of a few mb. In contrast to the results from the lowest-order Born approximation, the magnitude of these cross sections is less sensitive to the values of the cut-off parameters in the form factors. From the transition matrix in the coupled-channel approach, we have further evaluated the cross sections for the elastic process $\bar K\Lambda\to\bar K\Lambda$, $\bar K\Sigma\to\bar K\Sigma$, $\pi\Xi\to\pi\Xi$, and $\eta\Xi\to\eta\Xi$ as well as for the inelastic processes $\bar K\Lambda\to\bar K\Sigma$ and $\pi\Xi\to\eta\Xi$. Implications of the reactions studied here in $\Xi$ production from relativistic heavy ion collisions are discussed.
Ko Che Ming
Li Chun-Hong
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