We present the light-cone distribution amplitudes of the $\Xi$ baryons up to twist six on the basis of QCD conformal partial wave expansion to the leading order conformal spin accuracy. The nonperturbative parameters relevant to the DAs are determined in the framework of the QCD sum rule. The light-cone QCD sum rule approach is used to investigate both the electromagnetic form factors of $\Xi$ and the exclusive semileptonic decay of ${\Xi }_c$ as applications. Our estimations on the magnetic moments are ${\mu }_{{\Xi }^0}=-(1.92\pm 0.34){\mu }_N$ and ${\mu }_{{\Xi }^{-}}=-(1.19\pm 0.03){\mu }_N$. The decay width of the process ${\Xi }_c\to \Xi e^{+}{\nu }_e$ is evaluated to be $\Gamma =8.73\times {10}^{-14}\mathrm{GeV}$, which is in accordance with the experimental measurements and other theoretical approaches.

• Received 20 July 2009

DOI:https://doi.org/10.1103/PhysRevD.80.055015