September 27, 2004 to October 1, 2004
Interlaken, Switzerland
Europe/Zurich timezone

FAMOS, a FAst MOnte-Carlo Simulation for CMS

Sep 27, 2004, 2:20 PM
Kongress-Saal (Interlaken, Switzerland)


Interlaken, Switzerland

oral presentation Track 2 - Event processing Event Processing


Dr F. Beaudette (CERN)


An object-oriented FAst MOnte-Carlo Simulation (FAMOS) has recently been developed for CMS to allow rapid analyses of all final states envisioned at the LHC while keeping a high degree of accuracy for the detector material description and the related particle interactions. For example, the simulation of the material effects in the tracker layers includes charged particle energy loss by ionization and multiple scattering, electron Bremsstrahlung and photon conversion. The particle showers are developed in the calorimeters with an emulation of GFLASH, finely interfaced with the calorimeter geometry (e.g., crystal positions, cracks, rear leakage, etc). As the same software framework is used for FAMOS and ORCA (the full Object-oriented Reconstruction software for CMS Analysis), the various Physics Objects (electrons, photons, muons, taus, jets, missing ET, charged particle tracks, ...) can be accessed with a similar code with both fast and full simulation, thus allowing any analysis algorithm to be transported from FAMOS to ORCA (and later, to data analysis and DST reading) or vice-versa without any additional work. Altogether, a gain in CPU time of about a hundred can be achieved with respect to the full simulation, with little loss in precision.

Primary author

Dr F. Beaudette (CERN)

Presentation materials