Event generator for processes used for luminosity measurement at the ZEUS experiment

Source code (14Mb).
See the basic 'ReadMe.txt' file for compilation and usage instructions.
See also 'ReadMe.txt' files in sub folder the other information.

Important notes:

• The following processes are considered:
  • pe->pe+gamma with the photon emitted along the electron beam axis.
    The one-loop radiative corrections to lepton current are included.
  • pe->pe l^{+}l^{-} with l=e,mu. This process affect the electron tagger.
• Two external packages are used:
  • LoopTools ver.2.5 by T.Hahn.
  • QD by Y.Hida, Xi.S.Li and D.H.Bailey.
  These external codes are included into the source code archive for simplicity only .
  One must refer these packages whenever using the generator. The references are:
  • T. Hahn, Nucl.Phys.Proc.Suppl. {\bf 89}(2000)231-236.
  • Y.Hida, Xi.S.Li, D.H.Bailey, Tech. Report LBNL-46996(2000).
• System requirements:
  • 48h-long batch service with 2Gb RAM machines.
    The program was originally used with DESY Zeuthen batch service.
  • ifort-compiler for compilation of LoopTools with 16-byte precision.
  • Up to 4Gb of disc space for parallel V-term integration and event generation procedures.
• The program requires preliminary integration of the processes.
  It takes about 1-day when all calculations are parallel.
  The ready-to-use generator contains large integration grid files (~500Gb) and may requested at author.
• The paper is under preparation.
  The link for a reference will be added later.
• The matrix element expressions for all processes are presented here.

Last updated on 18.08.2010 by V.Makarenko