The structure, mixing angle, mass and couplings of the light scalar f0(500) and f0(980) mesons

The mixing angle, mass and couplings of the light scalar mesons f0(500) and f0(980) are calculated in the framework of QCD two-point sum rule approach by assuming that they are tetraquarks with diquark-antidiquark structures. The mesons are treated as mixtures of the heavy |H〉=([su][s¯u¯]+[sd][s¯d¯])/2 and light |L〉=[ud][u¯d¯] scalar diquark-antidiquark components. We extract from corresponding sum rules the mixing angles φH and φL of these states and evaluate the masses and couplings of the particles f0(500) and f0(980).