Abstract:Almost thirty years ago, Penny G. Estabrooks asked "Where and what are the scalar mesons?" [1]. The first part of her question can now be confidently responded [2]. However, with respect to the "What" many puzzles remain unanswered. Scalar and axial-vector mesons form part of a large family of mesons. Consequently, though it is useful to pay them some extra attention, there is no point in discussing them as isolated phenomena. The particularity of structures in the scattering of -basically -pions and kaons wit… Show more
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