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

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

2002-08-29

arxiv.org/abs/hep-ph/0208271v1

Nucl.Phys.Proc.Suppl.121:114-118,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages latex file. 4 fig.eps

Scientific paper

10.1016/S0920-5632(03)01824-3

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 $\sigma (0.6)$ and emphasize that a measurement of the $D_s$ semileptonic decays into $\pi\pi$ can reveal in a model-independent way its eventual gluon component $\sigma_B$. The analysis also implies that one expects an observation of the $K\bar K$ final states from the $\sigma_B$ 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 $\sigma (0.6)$ if the latter is a $\bar uu+\bar dd$ state

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