Study light scalar meson property from heavy meson decays

Original · EN

In the SU(3) symmetry limit, the ratio R≡ B(D+→ f₀l+ν)+ B(D+→ σl+ν) B(D+→ a₀⁰l+ν) is equal to 1 if the scalar mesons are qq states, while it is 3 if these mesons are tentraquark states. This ratio provides a model-independent way to distinguish the descriptions for light scalar mesons. It also applies to the B-→ Sl-ν and B⁰→ J/ψ(ηc) 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+→ S l+ν, B-→ S l-ν and B⁰→ J/ψ(ηc) S decays roughly have the order 10⁻⁴, 10⁻⁵ and 10⁻⁶, respectively. The B factory experiments and ongoing BEPC-II experiments are able to measure these channels and accordingly to provide the detailed information of the scalar meson inner structure.