Searches for exotic baryons of isospin 5/2 that consist of light quarks

摘要

The status of isospin-5/2 exotic baryons consisting of light-quarks is considered. A brief survey of theoretical studies devoted to them is given. Experimental searches for exotic baryons are traced from the first publication on the subject to the present day. Among possible candidates for an exotic baryon, the pentaquark baryon E-5/25/2 of mass M approximate to 1.44 GeV/ c(2) and width Gamma < 0.05 GeV/c(2) is the most probable. This state was recorded in six studies at five different facilities. Among these, there are two studies where the excess of the signal above the background is more than five standard deviations. The possibility of further searches for exotic baryons in various reactions is discussed.