Period Integrals (Givental's I-function) of Calabi-Yau Hypersurface in $C{P}^{N-1}$ and Intersection Numbers of Moduli Space of Quasimaps from $C{P}^1$ with Two Marked Points to $C{P}^{N-1}$

In this paper, we derive the generalized hypergeometric functions (period integrals) used in mirror computation of Calabi-Yau hypersurface in $C{P}^{N-1}$ as generating functions of intersection numbers of the moduli space of quasimaps from $C{P}^1$ with two marked points to $C{P}^{N-1}$.