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Final State Parton Showering and Fragmentation

PYTHIA 6.205 is used for final state QED and QCD parton showering and for the fragmentation of quarks and gluons. Parton showering is done for all final state ferminons with the exception of electrons. Final state QED showering of electrons
is turned off because the PYTHIA final state showering code indiscriminately uses the invariant mass of
final state fermion-antifermion pairs for the maximum virtuality scale.

The interface to PYTHIA is contained in ftp://ftp-lcd.slac.stanford.edu/ilc/ILC500/StandardModel/whizard-src/user.f90 . The source code for referenced subroutines can be found in ftp://ftp-lcd.slac.stanford.edu/ilc/ILC500/StandardModel/a6f/include .
Color flow information was not available in WHIZARD 1.40, and so an effort is made in subroutines such as kinematic information is used to identify color singlet systems (see ftp://ftp-lcd.slac.stanford.edu/ilc/ILC500/StandardModel/a6f/include/calcilc_a1sqfragment_a2sqcall.f90^{Image Modified} to identify color singlet systems
(see also and ftp://ftp-lcd.slac.stanford.edu/ilc/ILC500/StandardModel/a6f/include/ilccalc_fragmenta1sq_calla2sq.f90^{Image Modified} ).

Kinematic Cuts

FAQ

Whizard has no gluon emission by default, leading to potentially incorrect multiplicity distributions.

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