pidcalib : The efficient processing of LHCb/PidCalib PID calibration data using ostap project

Dependencies

• mandatory: ostap

Features

• The project allows to get 1D, 2D or 3D efficiency historgams for particle identification using the calibraton samples
• Calibration samples can be accessed either from CERN eos or via GRID
  • the first way requires read access to /eos/lhcb/grid partition
  • the second way require to have valid Grid proxy and access to LHCbDirac machinery via cernvmfs
  • both conditions are satisfied on CERN machines, lxplus.cern.ch in particular
• The calbration samples can be processed in parallel using pathos-based parallelisation
• The output histograms and useful processing information are placed in the outptu database, default is PIDCALIB.db

Usage

Run II processing

To use this function a helper script needs to be created, see example in examples directory. The script to be execute from command-line

pid_calib2.py 

All command-line arguments can be inspected using -h flag

ex_pidcalib_run2.py -h

• If calibration samples to be taken from the Grid, one needs to ensure that scripts in the directory scripts are in the path, e.g.

PATH=$PATH:<...>/scripts ex_pidcalib_run2.py ... 

Also for this mode one needs

• access to LHCbDirac at cernvmfs, see the content of dirac-command script in scripts directory

• valid Grid proxy

• In case /eos/lhcb/grid is accessible directly, no Grid proxy and machinery is requred. In this mode, a powerfull pathos-based parallelization is available, activated with -z/--parallel keys

ex_pidcalib_run2.py --parallel 

• If /eos/lhcb/grid is accessible directly, but input data are requested from the Grid, the optional conversion using the comman line flag --useeos is possible. It opens a way for the parallel processing.

Run I processing

ex_pidcalib_run11.py  P -s 20 -p MagUp -c 'P_hasRich==1'