This page has been set up and is maintained by F. Gianotti and A. Dell'Acqua

Introduction

The main purpose of this exercise is to go through the whole software chain, from event generation to simulation, reconstruction, analysis and prepare, at each step, minimal jobOptions for both the batch and the interactive environments, as well as simple algorithms to fill control histos (hopefully this will be useful for beginners).

Generators

This is the first step in the chain. We have generated Z--> ee events using Pythia, made them persitent with POOL and analyzed them by a customized algorithm running on the McEventCollection.

Throughout this exercise we have used Release 10.0.1 (unless differently specified).

Documentation

The use of event generators is well documented on the generator page. In addition, until Release 11 one should remember to bring the file PDGTABLE.MeV into the user run directory

> get_files PDGTABLE.MeV

Note that to persistify the generator output to POOL, users should add the following few lines into their jobOption files:

include( "AthenaPoolCnvSvc/WriteAthenaPool_jobOptions.py" )
theApp.Dlls   += [ "GeneratorObjectsAthenaPoolPoolCnv" ]
Stream1.ItemList += ["2101#*", "133273#*" ]
Stream1.OutputFile = "zee.pool.root"

and to persistify only events which pass a filter (e.g. the ElectronFilter):

include( "AthenaPoolCnvSvc/WriteAthenaPool_jobOptions.py" )
theApp.Dlls   += [ "GeneratorObjectsAthenaPoolPoolCnv" ]
Stream1.ItemList += ["2101#*", "133273#*" ]
Stream1.AcceptAlgs=["ElectronFilter"]
Stream1.OutputFile = "zee.pool.root"

A very useful set of jobOptions is available in

/afs/cern.ch/atlas/software/dist/10.0.1/Generators/GeneratorOptionsRome/GeneratorOptionsRome-00-00-08/share

from where they can be retrieved by means of the get_files command:

get_files -jo rome.004201.JimmyZee.py

Examples of simpler (minimal) Job Options files are given below. They run both in batch and in the interactive framework.

• gen_pythia_zee.py: to generate Z--> ee events and write them to POOL

• gen_pythia_zee_filt.py: to generate Z--> ee events, filter them and write them to POOL

• pythiacards_zee.py: Pythia cards for Z--> ee generation

• read_gen_fromPOOL.py: to read back Z--> ee events from POOL

• MyGenAlgs.cxx, MyGenAlgs.h: algorithm to retrieve the McEventCollection from StoreGate and fill some control histos