  Partial wave theory of a two dimensional scattering problem for an arbitray
short range potential and a nonlocal Aharonov-Bohm magnetic flux is
established. The scattering process of a ``hard disk'' like potential and the
magnetic flux is examined. Since the nonlocal influence of magnetic flux on the
charged particles is universal, the nonlocal effect in hard disk case is
expected to appear in quite general potential system and will be useful in
understanding some phenomena in mesoscopic phyiscs.
