Study ofK+K−production inπ+dinteractions at 10 GeV/c, and evidence for aJP=7−resonanceM(2750)decaying intoK+K−π+

We have studied the reactions ${\pi }^{+}n\to K^{+}{K}^{-}p$, ${\pi }^{+}p\to K^{+}{K}^{-}{\Delta }^{++}$, and ${\pi }^{+}p\to \left(K^{+}{K}^{-}{\pi }^{+}\right)p$ in 10-GeV/c ${\pi }^{+}d$ interactions using the large-aperture solenoid spectrometer at SLAC. We measure the cross sections times branching ratios for the production of the known meson resonances $f\left(1270\right)\mathrm{}$, $g\mathrm{}\left(1690\right)\mathrm{}$, and $h\mathrm{}\left(2040\right)\mathrm{}$. We also observe a new resonance with mass 2747±32 MeV, width 195±75 MeV, and production cross section times branching ratio into $K^{+}{K}^{-}{\pi }^{+}$ of 0.84±0.08 μb. The data are consistent with the quantum numbers of this state being $I=1\mathrm{}$, $J^P=7^{-}$.