Jilin Normal Univ, Inst Phys, Jilin Spring 136000, Peoples R China
; Qufu Normal Univ, Inst Phys & Engn, Qufu 273165, Peoples R China
; Inst Architecture & Ind, Dept Math & Phys, Hefei 230022, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
In this paper, the D-0 -> pi-1+nu(1) decay process is studied by applying light-cone QCD sum rules. The form factor of D -> pi transition is calculated by choosing a correlation function with a chiral current to eliminate the effect caused by the uncertainty of the twist-3 function of the pion. Therefore the calculated result of the form factor is improved, and the branching ratio of the D-0 -> pi-1+nu(1) decay process is consistent with the now experimental data.