Speaker
Anthony Hartin
(John Adams Institute, Oxford University)
Description
The bunch fields at the interaction point of the ILC have a dominant effect on
background pair production. The Breit-Wheeler, Bethe-Heitler and Landau-Lifshitz
processes have all been studied in detail. The number of background pairs per bunch
crossing due to these processes is well known. However the effect of the bunch fields
on the Breit-Wheeler process has not been calculated. This Stimulated Breit-Wheeler
(or Stimulated Two Photon Pair Production) process, contains cross-section
resonances, and significant numbers of background pairs may result from it. Presented
here is a theoretical calculation and numerical investigation of the Stimulated
Breit-Wheeler cross-section. This is a full QED calculation, and the external field
is treated with the semi-classical approximation. The form of the bunch field
considered is a plane wave, constant crossed electromagnetic field. Calculation of
resonances involved inclusion of the Electron Self Energy in the external field. The
end goal of the numerical investigation is the characteristics of new background
pairs that can be expected at the ILC.
Summary
Some QED work on new sources of background pairs
Author
Anthony Hartin
(John Adams Institute, Oxford University)
