A Complete Order-alpha**3 Calculation of the Cross Section for Polarized Compton Scattering
Abstract
The construction of a computer code to calculate the cross sections for the spin-polarized processes e-gamma=>e-gamma,e-gamma-gamma,e-e+e- to order-alpha**3 is described. The code calculates cross sections for circularly-polarized initial-state photons and arbitrarily polarized initial-state electrons. The application of the code to the SLD Compton polarimeter indicates that the order-alpha**3 corrections produce a fractional shift in the SLC polarization scale of -0.1% which is too small and of the wrong sign to account for the discrepancy in the Z-pole asymmetries measured by the SLD Collaboration and the LEP Collaborations.
Keywords
Cite
@article{arxiv.hep-ph/9711447,
title = {A Complete Order-alpha**3 Calculation of the Cross Section for Polarized Compton Scattering},
author = {M. L. Swartz},
journal= {arXiv preprint arXiv:hep-ph/9711447},
year = {2016}
}
Comments
37 pages, RevTeX document, 7 figures. The FORTRAN code comrad.f is available in gzip-compressed form at ftp://ftp.slac.stanford.edu/users/morris/comrad.f.gz and /afs/slac.stanford.edu/public/users/morris/comrad.f.gz. Cosmetically updated draft (moves some detail into an appendix)