S-wave phase shift in Λπ scattering

S-matrix for s-wave gravitational scattering

In the s-wave approximation the 4D Einstein gravity with scalar fields can be reduced to an effective 2D dilaton gravity coupled nonminimally to the matter fields. We study the leading order (tree level) vertices. The 4-particle matrix element is calculated explicitly. It is interpreted as scattering with formation of a virtual black hole state. As one novel feature we predict the gravitational...

S-wave scattering of strangeness -3 baryons

Fermion Scattering at a Phase Wave

We study fermion reflection at a phase wave which is formed during a bubble collision in a first order phase transition. We calculate the reflection and the transmission coefficients by solving the Dirac equation with the phase wave background. Using the results we analyze the damping and the velocity of the

Compactly Supported Spherically Symmetric Potentials Are Uniquely Determined by the Phase Shift of S-wave

It is proved that a compactly supported (or decaying faster than any exponential) spherically symmetric potential is uniquely determined by the phase shift δ(k) known for all k ∈ (a, b), 0 ≤ a < b < ∞. Here the phase shift δ(k) corresponds to the s-wave. No information about bound states energies and normalizing constants is assumed known

The Use of the Scattering Phase Shift in Resonance Physics

The scattering phase shift encodes a good amount of physical information which can be used to study resonances from scattering data. Among others, it can be used to calculate the continuum density of states and the collision time in a resonant process. Whereas the first information can be employed to examine the evolution of unstable states directly from scattering data, the second one serves a...