Semileptonic decays of pseudoscalar mesons to the scalar f_0 meson

摘要

The transition form factors of D_s→f_0?ν, D→f_0?ν and B_u→f_0?ν decays are calculated within the 3-point QCD sum rule method, assuming that f0 is a quark-antiquark state with a mixture of strange and light quarks. Having obtained the expressions of the transition form factors, the branching ratios of these decays are calculated. The experimental measurement of the branching ratios of these decays can provide a direct estimation of the mixing angle.