Exotic baryon

Ordinary pentaquark, which consists of four quarks and an anti-quark, is the only exotic baryon that has been claimed to be detected. Another exotic baryon which consists only of quarks is the H di-baryon^{[1] [2]}. The H di-baryon consists of two up quarks, two down quarks and two strange quarks. Unlike the pentaquark, this particle can be long lived or even stable.