2025/03/09 by Zhang, Si-Hai, Zhong, Tao, Fu, Hai-Bing +2
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2503.06365
In this paper, we carry on an investigation of the semileptonic decays Bs→ Ds^*ℓ νℓ. Firstly, we derive the moments of the Ds^*-meson longitudinal leading-twist light-cone distribution amplitude (LCDA) based on QCD sum rules within background field theory framework. Considering the contributions of the vacuum condensates up to dimension-six, its first ten non-zero ξ-moments are given. Meanwhile, we construct the Ds^*-meson longitudinal leading-twist LCDA by using the light-cone harmonic oscillator model. Then, using those moments, we fix the model parameters α2;Ds^* and B12;Ds^* by the least square method and apply them to calculate Bs → Ds^* transition form factors A1(q2), A2(q2) and V(q2) that are derived by using the QCD light-cone sum rules. At the large recoil region, we obtain A1(0) =0.632-0.135+0.228, A2(0) =0.706-0.092+0.109 and V(0) =0.647-0.069+0.076. Those form factors are then extrapolated to the allowed whole physical q2-region through the simplified series expansion. Finally, we obtain the branching fractions for the two decay channels Bs→ Ds^*ℓν_ℓ, \it i.e. \cal B(Bs0 → Ds*+e-νe)=(5.45-1.57+2.15)× 10-2, \cal B(Bs0 → Ds*+μ-νμ)=(5.43-1.57+2.14)× 10-2.