Event Generator Event Generators Information needed Event Generator
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Event Generator • Event Generators • Information needed • Event Generator Information • Event Kinematic Information • Generated Event Structure – generated particles • Particle Decay • Particle Interaction - secondaries
Current Generators FORTRAN • PYTHIA (an old version 6. 134 current 6. 203) Event Generator • HERWIG investigations Maintenance • QQ for B-decays • LHCb maintenance – • ARIADNE un-investigated allows rapid response to • (PDFLIB – for parton densities) physics, manpower overhead OO Generators • Central maintenance – • PYTHIA vsn 7 – β release converse of the above! • HERWIG under development • QQ ? ? – Particle Property services
Event Generator Information -track the version and the event generator used -important to keep tab of version – authors change things! -e. g. change in min. bias charged multiplicity between version of PYTHIA -keep track of “private” LHCb changes to a generator -implementation version in LHCb OO code – keep track of the bugs we introduce! (“most reported bugs are due to the experiments interface code” – Sjöstrand)
Event Kinematic Information • pp collisons different kinematics for every event • x-Bjorken, Mandelstam variables • QCD production mechanisms • Event type • study of b-production/fragmentation mechanisms • generator biases at 4 -vector level before full detector simulation
Event Particle Listings ØPrimary particle generation ØB oscillations? • for detector simulation • trigger studies • detector studies & corrections All information discussed so far can be generated independently of detector simulation ÞStandalone program from GEANT simulation ? Advantage: less emphasis on MC production co-ordinator getting things right Disadvantage: maintenance overhead
Particle (B-)Decay • Integral part of detector simulation (particular B-decays) • Need history information – where did particle come from? • mother particle, decay vertices, … • forced decay – well-defined code flag for decay modes • version of decay package (cf event generator info. )
Particle Interactions GEANT produced secondaries • history information: • mother particles • interaction vertex • hadronic/em shower development • GEANT mechanism Deal with multiple scatterings/event trigger (event overlay)
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