Abstract
A narrow baryon state has been found in the channel [Formula: see text] of quasi-real photoproduction on a deuterium target at the HERMES experiment. Its mass is 1528±2.6±2.1 MeV and its width is somewhat larger than the experimental resolution of 4.3-6.2 MeV. This state may be interpreted as the predicted S=+1 exotic Θ+ pentaquark baryon. No signal for a hypothetical Θ++ baryon was observed, indicating that the Θ+ is an isoscalar particle.
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