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Gauss: Generator Status

Patrick Robbe, LAL Orsay, 6 Oct 2009. Gauss: Generator Status. Generator Status. MC09 production running correctly with: Pythia 6.4 (most recent FORTRAN version) ‏ New EvtGen , after merging LHCb+BaBar+Tevatron last developments

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Gauss: Generator Status

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  1. Patrick Robbe, LAL Orsay, 6 Oct 2009 Gauss: Generator Status

  2. Generator Status • MC09 production running correctly with: • Pythia 6.4 (most recent FORTRAN version)‏ • New EvtGen, after merging LHCb+BaBar+Tevatron last developments • Spill-over generation in Gauss (not used for MC09) has been implemented: • Cannot be used to generate spill-over for special event types (Bc, Z0, W, Higgs, ...)‏

  3. Latest Developments • Bc generation has been updated to MC09 Gauss versions, • and many small problems fixed (PDF initialization, ...) by Jibo He, and can now be used since Gauss v34r5. • New models in LHCb EvtGen for B -> X ll generation (including Bs)‏ • Implemented by Nikolai Nikitin, available in Gauss v34r4 • SHERPA integration ongoing (Dortmund group): • C++ generator, alternative to both Pythia (production) and EvtGen (decay). Main work on decay part. • Can already be used as decay tool, with limitations: • Cannot handle correctly decay of broad hadrons produced by Pythia • Cannot generate CP violation in signal events (but can generate in inclusive b, opposite to EvtGen)‏

  4. Generator Problems • Problems have appeared when generating signal event types: • B0→ K*e+e-/B0→ K*m+m-: bug introduced in BaBar which propagated to LHCb, fixed in Gauss v34r4. Future EvtGen maintainance ? (package will be less and less maintained and tested by BaBar)‏ • Some decay files are obsolete or not correctly tested and crash in production. A quick test of the decay file should be performed by its author before being released: • How to test a decay file: http://lhcb-release-area.web.cern.ch/LHCb-release-area/DOC/gauss/generator/evtgen.php • List of old or untested decay files: http://lhcb-release-area.web.cern.ch/LHCb-release-area/DOC/decfiles/releases/latest/table_evttype.php • CP violation: • It has been showed that CP violation generation does not work with new EvtGen. • No correction yet.

  5. Useful Links • MC09 parameters: • https://twiki.cern.ch/twiki/bin/view/LHCb/SettingsMc09 • MC09 generator efficiencies: • http://lhcb-release-area.web.cern.ch/LHCb-release-area/DOC/STATISTICS/MC09STAT/Generation_MC09-b5TeV-md100.html • LHCb/EvtGen documentation: • http://lhcb-release-area.web.cern.ch/LHCb-release-area/DOC/gauss/generator/evtgen.php • List of event types and their documentation: • http://lhcb-release-area.web.cern.ch/LHCb-release-area/DOC/decfiles/releases/latest/table_evttype.php • Everything is accessible from the Gauss web-page: • http://lhcb-release-area.web.cern.ch/LHCb-release-area/DOC/gauss/

  6. Conclusion: Future Work • CP violation generation correction • Need to move to C++ Pythia: Pythia 8 • Need to think about maintainance of EvtGen (or move to Sherpa)‏ • Tuning of generators with first data: • Work prepared in Flavour Working Group • Need to be in contact with generator authors (Pythia, ...)‏

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