Search for the ${\Theta }^{+}$ pentaquark via the ${\pi }^{-}p\to K^{-}X$ reaction at 1.92 GeV/$c$

Abstract

The ${\Theta }^{+}$ pentaquark baryon was searched for via the ${\pi }^{-}p\to K^{-}X$ reaction in a missing-mass resolution of 1.4 MeV/$c^2$(FWHM) at J-PARC. ${\pi }^{-}$ meson beams were incident on the liquid hydrogen target with the beam momentum of 1.92 GeV/$c$. No peak structure corresponding to the ${\Theta }^{+}$ mass was observed. The upper limit of the production cross section averaged over the scattering angle of 2${}^{\circ }$ to 15${}^{\circ }$ in the laboratory frame was obtained to be 0.26 $\mu$b/sr in the mass region of 1.51$-$1.55 GeV/$c^2$.The upper limit of the ${\Theta }^{+}$ decay width using the effective Lagrangian approach was obtained to be 0.72 MeV/$c^2$ and 3.1 MeV/$c^2$ for $J_{\Theta }^P=1/2^{+}$ and $J_{\Theta }^P=1/2^{-}$, respectively.

5 pages, 3 figures, 1 table

References in corpus (3)

• Evidence of the Θ^+ in the γd \to K^+K^-pn reaction
• Search for Theta+ via pi- p --> K- X reaction near production threshold
• Improved study of a possible Theta+ production in the pp -> p K0 sigma+ reaction with the COSY-TOF spectrometer

Cited by in corpus (10)

• Coupled-channel dynamics in the reactions piN --> piN, etaN, KLambda, KSigma
• A New Hadron Spectroscopy
• QCD and the Strange Baryon Spectrum
• Hadron Physics at J-PARC
• Present status on experimental search for pentaquarks
• High-resolution search for the ${\Theta }^{+}$ pentaquark via a pion-induced reaction at J-PARC
• Meson-induced pentaquark productions
• Feasibility study of the $K^{+}d\to K^{0}pp$ reaction for the "${\Theta }^{+}$" pentaquark
• Observation of a narrow baryon resonance with positive strangeness formed in $K^{+}$Xe collisions
• Hadron and Quarkmonium Exotica