Evidence for the positive-strangeness pentaquark Θ+ in photoproduction with the SAPHIR detector at ELSA

By The H.E.S.S. Collaboration, J. Barth, et al. 2003

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Abstract The positive-strangeness baryon resonance Θ + is observed in photoproduction of the nK + K 0 s final state with the SAPHIR detector at the Bonn ELectron Stretcher Accelerator ELSA. It is seen as a peak in the nK + invariant mass distribution with a 4.8 σ confidence level. We find a mass M Θ + =1540±4±2 MeV and an upper limit of the width Γ Θ + K 0 Θ + is in the order of 300 nb. From the absence of a signal in the pK + invariant mass distribution in γ p→pK + K − at the expected strength we conclude that the Θ + must be isoscalar.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c8493d07254f7ad6f276e13386bad50ecfc797fc