Search for Theta+ via pi- p --> K- X reaction near production threshold

Abstract

We have searched for $Θ^{+}$ via $π^{-}p \to K^{-}X$ reaction using 1.87 and 1.92 GeV/c $π^{-}$ beam at the K2 beam line of the KEK 12 GeV Proton Synchrotron. In the missing mass spectrum at beam momentum of 1.92 GeV/$c$, a bump has been found at 1530 MeV/$c^{2}$ which is consistent with the mass reported by several experiments. The statistical significance of this bump, however, is only 2.5$-2.7σ$. Therefore we have derived the upper limit of $Θ^{+}$ production cross section via $π^{-}p \to K^{-}Θ^{+}$ reaction which is 4.3$μ$b at 90% confidence level assuming that $Θ^{+}$ is produced isotropically in the center of mass system.