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.
A new look at scalar mesons
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abstract
Light scalar mesons are found to fit rather well a diquark-antidiquark description. The resulting nonet obeys mass formulae which respect, to a good extent, the OZI rule. OZI allowed strong decays are reasonably reproduced by a single amplitude describing the switch of a qbar-q pair, which transforms the state into two colourless pseudoscalar mesons. Predicted heavy states with one or more quarks replaced by charm or beauty are briefly described; they should give rise to narrow states with exotic quantum numbers.
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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.