Scalar mesons in weak semileptonic decays of B(s)

The transition form factors of B-(s) -> S, with S denoting a scalar meson, are investigated in the light-cone sum rules approach. The numerical values are approximately twice the number estimated in the light-front quark model and QCD sum rules approach. Using these form factors, we present the analysis of the decay rates for B -> a(0)(1450)l (nu) over bar (l), B -> K-0(*)(1430)l (l) over bar, B-s -> K-0(*)(1430)l (nu) over tilde (l), and B-s -> f(0)(1500)l (l) over bar with l = e, mu, tau. The results indicate that magnitudes of BR((B) over bar (0) -> a(0)(1450)l (nu) over bar (l)) and BR(B-s -> K-0(*)(1430)l (nu) over bar (l)) arrive at the order of 10(-4), which can be measured in future experiments to clarify the inner structure of scalar mesons. It is also observed that BR(B -> K-0(*)(1430)tau(+)tau(-)) and BR(B-s -> f(0)(1500)tau(+)tau(-)) are an order of magnitude smaller than the corresponding channels of e(+)e(-) and mu(+)mu(-) final states due to the heavily suppressed phase space. Moreover, the longitudinal lepton polarization asymmetry for B -> K-0(*)(1430)l (l) over bar and B-s -> f(0)(1500)l (l) over bar are also investigated, whose values are close to -1 for the e(+)e(-) and mu(+)mu(-) pair except for the region close to the endpoints.