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UA(1) SYMMETRY BREAKING AND THE SCALAR SECTOR OF QCD
2001
International Journal of Modern Physics A
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It is shown that most of the unusual properties of the lowest lying scalar (and pseudoscalar) mesons can be understood, at the qualitative and quantitative level, on the basis of the breakdown of the U_A(1) symmetry coupled to the vacuum expectation values of scalars by the spontaneous breaking of chiral symmetry.
doi:10.1142/s0217751x01004189
fatcat:bbpzupmf65atpacts7i2ydyiam