; Lue, Cai-Dian] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
; [Wang, Wei] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy
In the SU(3) symmetry limit, semileptonic D+ -> Sl(+)nu and B- -> Sl(-)nu(-) decays, with S = a(0)(980), f(0)(980), and f(0)(600), are found to obey different sum rules in the (q) over barq and the tetraquark descriptions for scalar mesons. Thus these sum rules can distinguish the two scenarios for light scalar mesons model independently. This method also applies to the (B) over bar (0) -> J/psi(eta(c))S decays. Two kinds of SU(3) symmetry breaking effects are found to be under control, which will not spoil our method. The branching fractions of the D+ -> Sl(+)nu, B- -> Sl(-)nu(-), and (B) over bar (0) -> J/psi(eta(c))S decays roughly have the order 10(-4), 10(-5), and 10(-6), respectively. The ongoing BEPC II and the forthcoming Super B experiments are able to measure these channels and, accordingly, to provide detailed information of the scalar meson inner structure.