1 / 7

Event Generator

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)

bgilbreath
Download Presentation

Event Generator

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Event Generator • Event Generators • Information needed • Event Generator Information • Event Kinematic Information • Generated Event Structure – generated particles • Particle Decay • Particle Interaction - secondaries

  2. Current Generators • FORTRAN • PYTHIA (an old version 6.134 current 6.203) • HERWIG investigations • QQ for B-decays • ARIADNE un-investigated • (PDFLIB – for parton densities) • OO Generators • PYTHIA vsn 7 – β release • HERWIG under development • QQ ?? – Particle Property services • Event Generator Maintenance • LHCb maintenance – allows rapid response to physics, manpower overhead • Central maintenance – converse of the above!

  3. 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)

  4. 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

  5. Event Particle Listings • Primary particle generation • B oscillations? • for detector simulation • trigger studies • detector studies & corrections • All information discussed so far can be generated independently of detector simulation • Standalone program from GEANT simulation ? Advantage: less emphasis on MC production co-ordinator getting things right Disadvantage:maintenance overhead

  6. 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.)

  7. 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)

More Related