Production and decay ofΣ(1660)

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Abstract

An investigation has been performed of some properties of $\ensuremath{\Sigma}(1660)$ produced in the reaction ${K}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{+}(1660){\ensuremath{\pi}}^{\ensuremath{-}}$ at 2.87 GeV/c incident ${K}^{\ensuremath{-}}$ momentum. The decay modes observed for this state include $\ensuremath{\Lambda}(1405)\ensuremath{\pi}$ and $\ensuremath{\Sigma}\ensuremath{\pi}$. The spin and parity are measured to be ${J}^{P}={\frac{3}{2}}^{\ensuremath{-}}$. The differential cross section of the $\ensuremath{\Lambda}(1405)\ensuremath{\pi}$ decay mode is sharply peaked in the forward direction, falling exponentially with a slope of 5.6 \ifmmode\pm\else\textpm\fi{} 0.7 (Ge${\mathrm{V}/\mathit{c})}^{\ensuremath{-}2}$, while the slope for the ${\ensuremath{\Sigma}}^{0}{\ensuremath{\pi}}^{+}$ decay mode is 2.1 \ifmmode\pm\else\textpm\fi{} 0.4 (Ge${\mathrm{V}/\mathit{c})}^{\ensuremath{-}2}$. The difference in the ratio of backward to total events for the two decay modes also suggests that two $\ensuremath{\Sigma}(1660)'\mathrm{s}$ exist.

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