Partial decay widths in coupled-channel systems with the complex-scaled Jost function method

Partial decay widths of resonant states in a coupled-channel system are stu died by using the complex-scaled Jest function method (CSJFM). With CSJFM, we use the ratio of the S-matrices to calculate partial decay widths,and th en we need not introduce any "channel radius", which is used in standard sc attering theory. Combining the Jest function method (JFM) and the complex s caling method (CSM), we can easily obtain many resonant states even for a l arge total width and partial decay widths simultaneously. Several methods t o calculate partial decay widths in CSM are also discussed and are shown to give the same values in CSJFM.