In particle physics hexaquarks are a large family of hypothetical particles that would consist of six quarks or antiquarks of any flavours. With six constituent particles, there are several ways to combine quarks so that their colour charge is zero: a hexaquark can either contain six quarks, resembling two baryons bound together (a dibaryon), or three quarks and three antiquarks. Dibaryons are predicted to be fairly stable once formed. Robert Jaffe proposed the existence of a possibly stable H dibaryon (with the quark composition udsuds), made by combining two uds hyperons, in 1977.