test6_CPVFlavorTaggerSkim.py

#!/usr/bin/env python
 
 
 
"""
  This file skims events that are useful to test the time dependent CPV analysis tools,
  i.e. those events where the signal B0 meson is correctly MC matched and where no tracks on the tag side
  belong to the signal side. The variable used for skimming is isRelatedRestOfEventB0Flavor.
  As input one needs a MC mdst file for the signal channel B0sig->J/PsiKs.
  The script reconstructs B0sig->J/PsiKs on the signal side
  and applies the flavor tagger on the ROE.
  The vertex of B0sig is reconstructed (JPsi vertex) and the vertex of B0tag is reconstructed
  with the TagV module.
"""
 
import basf2 as b2
import modularAnalysis as ma
import os
import sys
 
from mdst import add_mdst_output
 
if len(sys.argv) != 3:
    sys.exit('Must provide three input parameters: [Belle_Belle2] [output_root_file_name]'
             )
 
belleOrBelle2Flag = sys.argv[1]
outRootFileName = sys.argv[2]
 
 
# create path
cp_val_path = b2.Path()
 
environmentType = "default"
 
if belleOrBelle2Flag == "Belle":
    os.environ['BELLE_POSTGRES_SERVER'] = 'can51'
    os.environ['USE_GRAND_REPROCESS_DATA'] = '1'
 
    environmentType = "Belle"
 
ma.inputMdstList(environmentType=environmentType, filelist=[], path=cp_val_path)
 
ma.fillParticleList(decayString='mu+:all', cut='', path=cp_val_path)
ma.reconstructDecay(decayString='J/psi:mumu -> mu+:all mu-:all', cut='abs(dM) < 0.11', path=cp_val_path)
ma.matchMCTruth(list_name='J/psi:mumu', path=cp_val_path)
 
if belleOrBelle2Flag == "Belle":
 
    # use the existent K_S0:mdst list
    ma.matchMCTruth(list_name='K_S0:mdst', path=cp_val_path)
 
    # reconstruct B0 -> J/psi Ks decay
    ma.reconstructDecay(decayString='B0:sig -> J/psi:mumu  K_S0:mdst', cut='Mbc > 5.2 and abs(deltaE) < 0.15', path=cp_val_path)
 
if belleOrBelle2Flag == "Belle2":
 
    # reconstruct Ks from standard pi+ particle list
    ma.fillParticleList(decayString='pi+:all', cut='', path=cp_val_path)
    ma.reconstructDecay(decayString='K_S0:pipi -> pi+:all pi-:all', cut='abs(dM) < 0.25', path=cp_val_path)
 
    # reconstruct B0 -> J/psi Ks decay
    ma.reconstructDecay(decayString='B0:sig -> J/psi:mumu K_S0:pipi', cut='Mbc > 5.2 and abs(deltaE) < 0.15', path=cp_val_path)
 
ma.matchMCTruth(list_name='B0:sig', path=cp_val_path)
 
ma.buildRestOfEvent(target_list_name='B0:sig', path=cp_val_path)
 
ma.applyCuts(list_name='B0:sig', cut='abs(isRelatedRestOfEventB0Flavor) == 1', path=cp_val_path)
 
# Skim 1
# The new algorithm
skimfilter = b2.register_module('SkimFilter')
skimfilter.set_name('SkimFilter_B2JPsiKs_NoTargetOfFT')
# Provide the particle lists that will be used as an event/skim filter
skimfilter.param('particleLists', ['B0:sig'])
cp_val_path.add_module(skimfilter)
# ------------------> summaryOfLists -----------------------------------------------------------------
 
 
# Create a new path for the skim output
B0skim_path = b2.Path()
# The filter provides a boolean, which is true if any of the argument particle lists are not empty
# skimfilter.if_value('=1', B0skim_path, AfterConditionPath.CONTINUE)
skimfilter.if_value('=0', B0skim_path)
 
# dump in MDST format
add_mdst_output(cp_val_path, True, outRootFileName)
 
ma.summaryOfLists(particleLists=['B0:sig'], path=cp_val_path)
 
# Process the events
ma.process(cp_val_path)
 
# print out the summary
print(b2.statistics)