Norbury J W, Townsend L W, Deutchman P A
Physics Department, Old Dominion University, Norfolk, VA 23508, USA.
Phys Lett A. 1985 Jun 3;109(6):261-4. doi: 10.1016/0375-9601(85)90609-7.
A resonant transition amplitude, valid to arbitrary order, is derived through the use of a complex energy T-matrix. A feature of this amplitude is its generality and simplicity making it useful for widespread applications in resonance theory.