Supernova Constraints on a holographic dark energy model

In this paper, we use the data of the type Ia supernova to constrain the model of holographic dark energy. The best fit results are $\Omega^0_m = 0.25$, the equation of the state of the holographic dark energy $\omega^0_\d = -0.91$ and the transition between the decelerating expansion and the accelerating expansion happened when the cosmological red-shift is $z_T=0.72$.