2023/07/05 by Cheng, Shan, Zhang, Shu-Lei
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2307.02309
In this paper we revisit Ds → f0 form factors from the light-cone sum rules with the light meson light-cone distribution amplitudes. The main motivation of this study is the differential decay width of Ds → [ππ]\rm S e νe measured recently by BESIII collaboration and the Ds → f0 form factor extracted under the intermediate resonant model. Our result of the differential width of Ds+ → f0 (→ [ ππ]\rm S) e+ νe decay obtained under the narrow width approximation is a litter bit lower than the data, the result obtained under the resonant Flatté model is in consistent with the data while shows a litter bit larger, indicating a sizable mixing ∼ 20° between ss and uu+ dd of f0. In order to obtain a model independent prediction, we suggest to calculate Ds → [ ππ]\rm S form factors with the isoscalar scalar dipion light-cone distribution amplitudes. Our calculation of Ds → [ ππ]\rm S form factors is carried out at the leading twist level due to the finite knowledge of dipion system, the result of differential width shows a moderate evolution in contrast to that obtained from the narrow width approximation and the Flatté model, revealing a bright prospect to study the four-body leptonic decays of heavy mesons with the dimeson light-cone distribution amplitudes.