Tests of the Nature of Scalar Mesons and Tests of the Gluon Content from D-(s) Semileptonic Decays

H.G. Dosh , Stephan Narison (1)

1 PMT - Laboratoire de Physique Mathématique et Théorique

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

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

H.G. Dosh, Stephan Narison. Tests of the Nature of Scalar Mesons and Tests of the Gluon Content from D-(s) Semileptonic Decays. QCD 02 9th High-Energy Physics International Conference on Quantum ChromoDynamics, Jul 2001, Montpellier, France. pp.114 - 118, ⟨10.1016/S0920-5632(03)01824-3⟩. ⟨hal-00268376⟩