Charge-Exchange Production Mechanism forK*(890)

Abstract

We present new results on ${K}^{\ensuremath{-}}p\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}n$ at 5.5 GeV/c. We fit all the available $\frac{d\ensuremath{\sigma}}{\mathrm{dt}}$ and decay density-matrix elements for the ${K}^{\ifmmode\pm\else\textpm\fi{}}N\ensuremath{\rightarrow}{K}^{*0}N$ charge-exchange reactions. The difference between the ${K}^{+}$ and ${K}^{\ensuremath{-}}$ reactions is explained successfully in terms of interference between a $\ensuremath{\rho}$ Regge pole and strong absorptive corrections to the $\ensuremath{\pi}$ Regge pole. This difference is related by vector dominance (VDM) to the ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ photoproduction cross sections and polarized-photon asymmetry data. The VDM predictions are only qualitatively successful.

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