摘要
Experimental searches for pentaquark hadrons comprised of light flavors have a long and vivid history. No undisputed candidates have been found in 50 years. The first wave of observations of pentaquark candidates containing a strange antiquaxk occurred in the early seventies, see e.g. a review in the 1976 edition of Particle Data Group listings for Z0（1780）, Z0（1865） and Z1（1900） [1].
Experimental searches for pentaquark hadrons comprised of light flavors have a long and vivid history. No undisputed candidates have been found in 50 years. The first wave of observations of pentaquark candidates containing a strange antiquaxk occurred in the early seventies, see e.g. a review in the 1976 edition of Particle Data Group listings for Z0（1780）, Z0（1865） and Z1（1900） [1].
