Furry picture transition rates in the intense fields at a lepton collider interaction point

TL;DR

This paper derives new analytic expressions for beamstrahlung transition rates in intense electromagnetic fields at lepton colliders, using solutions of the Dirac equation in co-propagating charge bunch fields, enhancing understanding of particle interactions in such environments.

Contribution

It introduces a novel approach to calculating beamstrahlung rates by solving the Dirac equation with co-propagating charge bunch fields and applying the Furry picture in collider physics.

Findings

Derived new analytic expressions for beamstrahlung transition rates.

Compared results with single charge bunch electromagnetic fields.

Techniques applicable to other collider physics processes.

Abstract

The effect on particle physics processes by intense electromagnetic fields in the charge bunch collisions at future lepton colliders is considered. Since the charge bunch fields are tied to massive sources (the $e^{+}e^{-}$ charges), a reference frame is chosen in which the fields appear to be co-propagating. Solutions of the Dirac equation minimally coupled to the electromagnetic fields reasonably associated with two intense overlapping charge bunches are obtained and found to be a Volkov solution with respect to a null 4-vector whose 3-vector part lies in the common propagation direction. These solutions are used within the Furry interaction picture to calculate the beamstrahlung transition rate for electron radiation due to interaction with the electromagnetic fields of two colliding charge bunches. New analytic expressions are obtained and compared numerically with the beamstrahlung in the electromagnetic field of one charge bunch. The techniques developed will be applied to other collider physics processes in due course.