B_s → f_0 (980) Transition Form Factors Within the k_T Factorization Approach

In the paper, we apply the kT factorization approach to deal with the Bs → f0 (980) transition form factors in the large recoil regions, i.e. the small q 2 regions. For the purpose, we adopt the B-meson wave-functions ΨB , ΨB and δ that include the three-Fock states contributions to do our discussion. Although the scalar meson f0 (980) is widely perceived as the 4-quark bound state (scenario 2), but the distribution amplitudes of 4-quark states are still unknown to us, so we adopt 2-quark model (scenario 1) for scalar meson f0 (980) in our discussion. By varying the B-meson wave-function parameters within their reasonable regions, we obtain F0(0) = F+(0) = 0.20 ± 0.02, FT(0) = 0.24 ± 0.02. Our present results for these form factors are consistent with the light-cone sum rule results obtained in the literature.

Bs→f0(980) Transition Form Factors Within the kT Factorization Approach

In the paper, we apply the k_T factorization approach to deal with the B_s→f₀(980) transition form factors in the large recoil regions, i.e. the small q² regions. For the purpose, we adopt the B-meson wave-functions Ψ_B, Ψ_B and δ that include the three-Fock states contributions to do our discussion. Although the scalar meson f₀(980) is widely perceived as the 4-quark bound state (scenario 2), but the distribution amplitudes of 4-quark states are still unknown to us, so we adopt 2-quark model (scenario 1) for scalar meson f₀(980) in our discussion. By varying the B-meson wave-function parameters within their reasonable regions, we obtain F₀(0)=F₊(0)=0.20±0.02, F_T(0)=0.24±0.02. Our present results for these form factors are consistent with the light-cone sum rule results obtained in the literature.