How to access the SUSY D3PD Meta-Data information

def susyTrigMeta():

   treeTrigMeta = TChain("susyMeta/TrigConfTree")
  ## This tree contains the full trigger configuration.

   for i in range(0,len(files)):
       treeTrigMeta.Add(files[i])
   treeTrigMeta.SetBranchStatus("*",1)

   numberOfEntries = treeTrigMeta.GetEntries()

   chainID_chainName_Map = {}

   print "** Number of Entries in trigMeta:",numberOfEntries

   if numberOfEntries > 0:

       for i in range(0,1):
           treeTrigMeta.GetEntry(i)
           mapLVL1Prescale = treeTrigMeta.LVL1PrescaleMap
           mapHLTPrescale  = treeTrigMeta.HLTPrescaleMap
           mapName         = treeTrigMeta.HLTLowerChainNameMap
           HLTnameMap  = treeTrigMeta.HLTNameMap
           LVL1nameMap = treeTrigMeta.LVL1NameMap
           for k,j in mapLVL1Prescale:
               chainID_chainName_Map[LVL1nameMap[k]] = k
           for k,j in mapHLTPrescale:
               if "EF" in k:
                   chainID_chainName_Map[HLTnameMap[k]] = k
       print "==> Got trigger configuration"

   else:
       print "==> Didn't get configuration, MetaData Tree was empty."
   return chainID_chainName_Map

#print "Into trigger configuration ==>"

####################################

#chain_ID_Name_Map = susyTrigMeta()
#print chain_ID_Name_Map

####################################

• You can use it in the loop over events in the D3PD:

#    for L2Chain in susyTree.trig_L2_passedPhysics:
#        print L2Chain, chain_ID_Name_Map[L2Chain]

#    print " ==> Chains that passed this event:"
#    for EFChain in susyTree.trig_EF_passedPhysics:
#        print "Chain ID:", EFChain, "Chain Name", chain_ID_Name_Map[EFChain]