From Wiki Les Houches 09

Conveners present: Filip Moortgat (Exp), Peter Richardson (Th), Steffen Schumann (Th)
(Click here for Tools and Monte Carlo Session 1 (SM))

Contents 1 Existing Codes and Implementations 2 Framework for new model implementations 3 SM for BSM (with Session 1) 4 Detector simulation (with Session 1) 5 Flavour Les Houches Accord 6 Common non-susy BSM scenario and benchmark points 7 Training

Existing Codes and Implementations

• Are all interesting models currently implemented?
  • non-minimal models like hidden valley or quirks?
  • need for modified shower or fragmentation models?
• Update the Durham / Les Houches BSM Tools repository: Les Houches BSM Tools Repository

Framework for new model implementations

• Status of QNUMBERS approach: arXiv:0712.3311
• Implementation of arbitrary models as an evolution of the BSM-LHEF
  • Feynman rule packages: LanHEP, FeynRules
  • spectrum calculators
  • (matrix element) generator interfaces
  • interfaces to parton showers and hadronisation models
  • generator validation strategies
• incorporation into validated generator versions used by experiments

SM for BSM (with Session 1)

• Automated ME+PS matching for BSM processes
• Boosted hadronic decays of BSM particles and decay products
• BSM applications of New Jet Algorithms
• Impact of MC tuning / uncertainty evaluations, on New Physics searches and measurements?

Detector simulation (with Session 1)

While in general it is to hoped that experiments will correct for detector effects, producing particle-level measurements valid within some systematic uncertainty, this is not always the case. Some key measurements only exist in uncorrected form, and a detector smearing or acceptance needs to be applied to theoretical/MC results before they can be compared to the data. Also, in some phenomenological evaluations of possible new measurements, it is desirable to have a rough simulation to estimate their robustness against detector effect.

We propose to evaluate tools in this area, and examine the requirements they might need to meet. A key issue is likely to be a standard output format for "reconstructed" objects such as jets, missing transverse energy etc.

• Review of physics requirements
  • Acceptance, resolution, trigger and reconstruction efficiency
  • Granularity
  • Magnetic field
  • B-tagging

• Review of publicly available tools
  • PGS http://www.physics.ucdavis.edu/~conway/research/software/pgs/pgs.html
  • Delphes http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0903.2225
  • AcerDet http://www.slac.stanford.edu/spires/find/hep/www?eprint=hep-ph/0207355
  • ...?

• Review of Software Requirements (integration into tool chain)
  • Standardized input from generators (HepMC? At what level? Final state particles?)
  • Standardized output to Rivet and/or user code (TBD?)

• Comparison/Validation against internal detector simulations
  • ATLAS (Atflast) http://www.hep.ucl.ac.uk/atlas/atlfast/
  • CMS (?)
  • Tevatron, HERA, LEP...?
  • Default LHC detector parametrisations?

Flavour Les Houches Accord

• With Tools WG of Flavor/LHC workshops. Model independent parametrization of flavor related quantities such as Wilson coefficients, exp. results, etc. Modify existing SLHA "structure" to host this accord? S. Heinemeyer, N. Mahmoudi.

Common non-susy BSM scenario and benchmark points

• Define & generate some benchmark common data sets?
• Discussion (accord?) on how experiments and theory might best interact on new model testing

Training

• Possible training sessions on how to go from a model to event generation with new tools
  • Feynman rules: FeynRules, LanHep
  • spectrum calculators
  • MC generators: Herwig, Pythia, Sherpa, Whizard, MadGraph ...
  • detector simulation: Delphes

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