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Tests of the nature and of the gluon content of the σ(0.6) from D and D_{s} semileptonic decays

H. G. Dosch·S. Narison
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Abstract

We summarize the different features which show that QCD spectral sum rule analyses of the scalar two- and three-point functions do not favour the $\bar uu+\bar dd$ interpretation of the broad and low mass $σ(0.6)$ and emphasize that a measurement of the $D_s$ semileptonic decays into $ππ$ can reveal in a model-independent way its eventual gluon component $σ_B$. The analysis also implies that one expects an observation of the $K\bar K$ final states from the $σ_B$ which may compete (if phase space allowed) with the one from a low mass $\bar ss$ state assumed in the literature to be the SU(3) partner of the observed $σ(0.6)$ if the latter is a $\bar uu+\bar dd$ state

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H. G. Dosch, S. Narison. 2002-08-29. Tests of the nature and of the gluon content of the σ(0.6) from D and D_{s} semileptonic decays. https://doi.org/10.1016/s0920-5632(03)01824-3

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