Properties of theN*(1730)

Abstract

The $N^{*}\mathrm{}\left(1730\right)\mathrm{}$ with a mass of 1730 ± 15 MeV and a width of 130± 30 MeV is produced in the reaction ${\pi }^{-}p\to {\pi }^{-}{N}^{*}{\mathrm{}\left(1730\right)\mathrm{}}^{+}$ at $6 \frac{\mathrm{GeV}}{c}$. The principal decay mode of this $N^{*}$ is $N\pi \pi$ and not $\Delta \pi$. The $N\pi$ decay rate is found to be much smaller, and the $\Lambda K$ decay rate is found to be much larger than the accepted rates for the well-known $N_{\frac{1}{2}}^{}{}_{}{}^{*}\mathrm{}\left(1680\right)\mathrm{}$ states ($D_{\frac{5}{2}}$ and $F_{\frac{5}{2}}$), thus establishing that the object that we observe is not the $N_{\frac{1}{2}}^{}{}_{}{}^{*}\mathrm{}\left(1680\right)\mathrm{}$.