【摘 要】
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Hadrons made by diquark-antidiquark pairs(tetraquarks)are held together by QCD forces in an overall color singlet.As stated in the original proposals and similarly to baryons and qq mesons,tetraquarks form complete multiplets of the flavour symmetry,SU(3)
【机 构】
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Dipartimento di Fisica and INFN,Sapienza Università di Roma,Piazzale Aldo Moro 2,I-00185 Roma,Italy
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Hadrons made by diquark-antidiquark pairs(tetraquarks)are held together by QCD forces in an overall color singlet.As stated in the original proposals and similarly to baryons and qq mesons,tetraquarks form complete multiplets of the flavour symmetry,SU(3)f,broken by the light quark mass differences[1-3](for reviews on exotic hadrons,see Refs.[4-10].For earlier accounts see also Ref.[11].Quark mass differences determine hadron mass differences in two ways:proportionally to the number of valence strange quarks and via the differences in hyperfine,spin-spin interaction[12-14].
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