Search for the Θ+ Pentaquark via the πpKX Reaction at 1.92GeV/c

K. Shirotori et al.
Phys. Rev. Lett. 109, 132002 – Published 26 September 2012

Abstract

The Θ+ pentaquark baryon was searched for via the πpKX reaction with a missing mass resolution of 1.4MeV/c2 (FWHM) at the Japan Proton Accelerator Research Complex (J-PARC). π meson beams were incident on the liquid hydrogen target with a beam momentum of 1.92GeV/c. No peak structure corresponding to the Θ+ mass was observed. The upper limit of the production cross section averaged over the scattering angle of 2° to 15° in the laboratory frame is obtained to be 0.26μb/sr in the mass region of 1.511.55GeV/c2. The upper limit of the Θ+ decay width is obtained to be 0.72 and 3.1 MeV for JΘP=1/2+ and JΘP=1/2, respectively, using the effective Lagrangian approach.

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  • Received 15 March 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.132002

© 2012 American Physical Society

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Vol. 109, Iss. 13 — 28 September 2012

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