The reflection time difference, the energy derivative of the phase difference between two reflection amplitudes, is a signed sum of Lorentzians centered at the S-matrix zeroes and can be read off from the unitary deficit under weak absorption.
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Reflection Time Difference as a probe of S-matrix Zeroes in Chaotic Resonance Scattering
The reflection time difference, the energy derivative of the phase difference between two reflection amplitudes, is a signed sum of Lorentzians centered at the S-matrix zeroes and can be read off from the unitary deficit under weak absorption.