22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

Study light scalar mesons from heavy quark decays

23 Jul 2010, 12:15
Salle 253 ()

Salle 253

Parallel Session Talk 04 - Hadronic Structure, Parton Distributions, soft QCD, Spectroscopy 04 - Hadronic Structure, Parton Distributions, soft QCD, Spectroscopy


Prof. Cai-Dian Lu (IHEP,Beijing)


It is a difficult task to probe internal structures of the scalar mesons below or near 1GeV. In the SU(3) symmetry limit, the semileptonic D^+ --> Sl^+ nu and B^+ Slnubar decays, with S=a_0, f_0 and sigma, are found to obey very different sum rules in the two scenarios for scalar mesons. Thus it can uniquely distinguish the qqbar and the tentraquark descriptions for light scalar mesons model-independently. This also applies to the B^0 --> J/psi(eta_c) S decays. The SU(3) symmetry breaking effect is found to be under control, which will not spoil our method. The branching fractions of the D^+ --> Sl^+nu, B^+ --> Sl nubar and B^0 --> J/psi(eta_c) S decays roughly have the order 10^-4, 10^-5 and 10^-6, respectively. The ongoing BES-III and the forthcoming Super B experiments are able to measure these channels and accordingly to provide the detailed information of scalar meson inner structure.

Primary author

Prof. Cai-Dian Lu (IHEP,Beijing)


Dr Wei Wang (INFN, Bari,)

Presentation Materials