Results from3.0−GeVcK+Interactions in Hydrogen

The interaction of $3.0-\frac{\mathrm{GeV}}{c}$ $K^{+}$ mesons on protons was studied in an exposure of the Brookhaven National Laboratory (BNL) 80-in. hydrogen bubble chamber at the alternating gradient synchrotron (AGS). Results are presented concerning a search for resonances requiring higher $\mathrm{SU}\left(3\right)\mathrm{}$ representations than 8 or 10, namely, an isotopic-spin-1 ($K^{+}{K}^{+}$) or $-\frac{3}{2} \left(K^{+}{\pi }^{+}\right)$ boson, and an isotopic-spin-0 or -1 ($K^{+}n$) baryon. Evidence is also given for the existence of the $N^{*}\mathrm{}\left(1400\right)\mathrm{}$ resonance, as well as a new ($K\pi$) resonance with mass 1260±20 MeV and width 70 MeV.