guest ::
| Home > Publications database > Incoherent pair background processes with full polarizations at the ILC |
| Home > Publications database > Incoherent pair background processes with full polarizations at the ILC |
| Book/Report | PUBDB-2023-01632 |
2007
This record in other databases: 
Please use a persistent id in citations: doi:10.3204/PUBDB-2023-01632
Report No.: EUROTEV-REPORT-2007-040; PAC07-THPMN080
Abstract: Incoherent background pair production processes are studied with respect to full polarizations of all states. Real initial photon polarizations are obtained via a QED calculation of the beamstrahlung process. Virtual photon polarizations are related to the electric field of the colliding bunches at the point of pair production. An explicit expression for the virtual photon polarization vector is developed and found to have no circular polarization component. Pair polarization states are highly dependent on initial state circular polarization and are consequently produced almost unpolarized. The Breit-Wheeler cross-section with full polarizations is calculated and coded into the CAIN pair generator program. Numerical evaluations of the ILC, operating with the seven proposed collider parameter sets, shows that there are 10 - 20% less low energy pairs than previously thought. Collider luminosity, as calculated by CAIN, remains the same.
Keyword(s): beam handling techniques ; electron accelerators ; electron beams ; linear colliders ; particle beam bunching ; photon polarisation ; quantum electrodynamics ; Breit-Wheeler cross-section ; CAIN pair generator program ; ILC ; QED calculation ; beamstrahlung process ; circular polarization ; collider luminosity ; colliding bunches ; electric field ; electron energy ; incoherent pair background processes ; photon polarizations ; Equations ; Fourier transforms ; Photon collider ; Physics ; Polarization ; Production ; Stokes parameters ; Taylor series ; Vectors
|
The record appears in these collections: |
PDF
PDF (PDFA)