A fit of D_s^+ -> K Kbar pi amplitudes supports a tetraquark plus instanton-mixing picture of light scalar mesons, with mixed success in other charm decay channels.
Mechanism for a next-to-lowest lying scalar meson nonet
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abstract
Recent work suggests the existence of a non-conventional lowest-lying scalar nonet containing the a0(980). Then the a0(1450) and also the K0*(1430) are likely candidates to belong to a conventional p-wave $q \bar q$ nonet. However a comparison of their properties with those expected on this basis reveals a number of puzzling features. It is pointed out that these puzzles can be resolved in a natural and robust way by assuming a ``bare'' conventional p-wave scalar $q \bar q$ nonet to mix with a lighter four quark $qq \bar q \bar q$ scalar nonet to form new ``physical'' states. The essential mechanism is driven by the fact that the isospinor is lighter than the isovector in the unmixed $qq \bar q \bar q$ multiplet.
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Light scalar mesons in D^+, D_s^+ decays into three pseudoscalars
A fit of D_s^+ -> K Kbar pi amplitudes supports a tetraquark plus instanton-mixing picture of light scalar mesons, with mixed success in other charm decay channels.