Speaker
Dr
F. Beaudette
(CERN)
Description
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)
