Speaker
Kenji Nishiwaki
(Shiv Nadar University)
Description
We find a new contribution in wave-packet scatterings, which has been overlooked in the standard formulation of S-matrix. As a concrete example, we consider a two-to-two scattering of light scalars 's' by another intermediate heavy scalar 'Phi', in the Gaussian wave-packet formalism: ss → Phi → ss. This contribution can be interpreted as an “in-time-boundary effect” of s for the corresponding Phi → ss decay, proposed by Ishikawa et al., with a newly found modification that would cure the previously observed ultraviolet divergence. If time permits, we show that such an effect can be understood as a Stokes phenomenon in an integral over complex energy plane.
