PMCS Tau, a Parameterized fast Monte Carlo Simulation of Taus

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Introduction
Ingredients
Results
Misc

back to: Bryan's Tau ID homepage
back to: Bryan's homepage

Introduction

There is a PMCS homepage where one can find information about the ntuples and a User's Guide.

Using a Geant based Monte Carlo detector simulation, one can simulate in fine detail the interactions of particles with the detector. One also tries to simulate the digitization and readout as close as possible to the actual hardware. One pays for the care for detail in CPU time to simulate an event. Given the huge Run II event samples, it may not always be possible to generate all of the necessary simulated events needed to do a physics analysis; therefore, one resorts to a parameterized Monte Carlo simulation (PMCS) to generate simualted events, which can be up to 1000 times faster. Obviously, the trick is to parameterize the detector well enough so that analyses are not biases.

I'm going to discuss the PMCS Tau package, and will concentrate on hadronic decays of the Tau.

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Ingredients

package purpose
pmcs
pmcs_util
pmcs_cal Distributes energy among the calorimeter cells accoring to eta, phi, and particle type. Also forms toweres.
pmcs_chprt Smears track momentum
pmcs_jet Runs a jet algorithm on generator particles or on calorimeter cells.
pmcs_tau Combines tracks and jets to make tau candidates.

package	purpose
pmcs
pmcs_util
pmcs_cal	Distributes energy among the calorimeter cells accoring to eta, phi, and particle type. Also forms toweres.
pmcs_chprt	Smears track momentum
pmcs_jet	Runs a jet algorithm on generator particles or on calorimeter cells.
pmcs_tau	Combines tracks and jets to make tau candidates.

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Results

Here are some pilot histograms comparing the generator Taus and the PMCS Taus. Since data is not yet available, also compare with reco.

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Misc. Notes

A list of generator files on disk can be found at: /monte/carlo/ggraham/mcc99_2/dest/genfiles
For more documentation, try look at Greg's pmcs_doc
Try looking in ~ggraham/umd2/pmcs/ to see the most recent version Greg (the PMCS release manager) has tested.
PMCS Meeting Minutes
In addition to the tradition flat cuts, still need to try out the "hmatrix", "NN", and "PDE" on Taus in PMCS context.

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Send comments and suggestion to brsmith@fnal.gov

Last modified: Aug 17, 2000