oevrall architecture -- Pythia addon?  Pythia version?


stage 1 -- do the Z' production weight, decay rate, decay angles
  what particles to use in finial state -- e+e-, t'b', Skands, vquarks?

stage 2 --
really want a v-hadronization routine to avoid problems with expt QCD
  settings (GEANT)
  turn off strange quark in QCD-like showering/frag
  change masses of QCD hadrons consistently
  compute new v-hadron models internally [long way off]
  do independent fragmentation or QCD-like showering/fragmentation
    [while avoiding resonances at various charm thresholds etc]


fragment a vquark-vsquark pair
catch the gluons in a shower and make them massive

remove the old LHA output version

work with vhadrons written out as QNUMBERS or as existing
 Pythia particles [but avoid h0]
   -- check with ATLAS  -- how does ATLAS plan to deal with new particles?
   -- ask Mrenna about plans for a standard?

various input modes

Stage 3a output: decay v-hadrons directly: 
  challenges : QNUMBERS needed? [event record]
               decays inside detector [GEANT]

Do we need to be able to write out all the vhadrons
  their numbers, masses, brnaching fractions ?

Stage 3b output: full Pythia output


underlying event correctly? read in versus run through start to finish