Cross Sections and Beam Asymmetries for K+ Sigma*- photoproduction from the deuteron at 1.5-2.4 GeV

Abstract

The $\hat{I}\pounds (1385)$ resonance, or $\hat{I}{\pounds }^{\ast }$, is well-known as part of the standard baryon decuplet with spin $J=3/2$. Measurements of the reaction ${\hat{I}}^{3}p\to K^{+}\hat{I}{\pounds }^{\ast 0}$ are difficult to extract due to overlap with the nearby $\hat{I}›(1405)$ resonance. However, the reaction ${\hat{I}}^{3}n\to K^{+}\hat{I}{\pounds }^{\ast -}$ has no overlap with the $\hat{I}›(1405)$ due to its charge. Here we report the first measurement of cross sections and beam asymmetries for photoproduction of the \sigs from a deuteron target. % where the $K^{+}$ and $\ddot{I}{€}^{-}$ are detected in the LEPS spectrometer. The cross sections at forward angles range from 0.4 to 1.2 $\hat{I}¼$b, with a broad maximum near $E_{\hat{I}}^3\simeq 1.8$ GeV. The beam asymmetries are negative, in contrast to postive values for the ${\hat{I}}^{3}n\to K^{+}\hat{I}{\pounds }^{-}$ reaction.

accepted in Phys. Rev. Lett