CoherentK+dInteractions at 12GeVc

We have made a study of the coherent reactions $K^{+}d\to K^{+}{\pi }^{+}{\pi }^{-}d$ and $K^{+}d\to K^0{\pi }^{+}d$ at 12 $\frac{\mathrm{GeV}}{c}$, using data obtained in the SLAC 82-in. bubble chamber. The cross sections for these two processes are 331±35 and 19±4 μb, respectively. The reaction $K^{+}d\to K^{+}{\pi }^{+}{\pi }^{-}d$ is dominated by $Q$ production in the $K\pi \pi$ system. The shape of the $Q$ enhancement is nearly identical to that observed in the reaction $K^{+}p\to K^{+}{\pi }^{+}{\pi }^{-}p$ at similar energies. This result may be interpreted in terms of mixing between the strange members of the $A_1$ and $B$ nonets. There are also an $L$ signal at $M\left(K\pi \pi \right)\sim 1.72$ GeV and a $d^{*}$ signal at $M\left(d{\pi }^{+}\right)\sim 2.2$ GeV. The $L$ appears to be formed primarily in conjunction with the $d^{*}$, with the ${\pi }^{+}$ meson shared between the two of them. The reaction $K^{+}d\to K^0{\pi }^{+}d$ is dominated completely by $K^{*}\mathrm{}\left(890\right)\mathrm{}$ production.