How to quickly check output D3PDs ?

...more detailed info coming soon...

With CINT :

root -l SUSY.root
root [0]
Attaching file SUSY.root as _file0...
root [1] ROOT::Cintex::Enable()
root [2] gSystem->Load("libATLASWatchManDict")
(int)1
root [3] SUSYTree
(class TTree*)0x921ab60
root [4] SUSYTree->Draw("@jet4mom.size()")

you get the number of the jets distribution

root [5] SUSYTree->Draw("@jet4mom.size()","channels.data()==\"l\"")

distribution of the number of jets only for those events passing the set of cuts of the analysis/channel "l".

root [6] SUSYTree->Draw("@jet4mom.size()","channels.data()==\"999\"")

As for that example we switched off the skimming, we keep all the events, even those not passing at least one analysis/channel. They are flagged by default as "channels=='999'".

With pyroot :

import ROOT
import ATLASWatchMan.Bindings
f = ROOT.TFile("SUSY.root")
t = f.Get("SUSYTree")
#loop over the events
for ev in range(t.GetEntries()):
    t.GetEntry(ev)
    for i,el in enumerate(t.electron4mom):
        print "el.Pt(): ", el.Pt()
        for chan in t.electronChannels[i]:
           print "el chan: ", chan
        print
        if "1lep" in t.electronChannels[i]:
            print "I'm using the right electron for the '1lep' channel: Ok!"
        if "DEFAULT" in t.electronChannels[i]:
            print "I'm using the right electron for the 'DEFAULT' channel: Ok!"

        #Now I want to use jets as well.In the same way you can ask jets belonging only to a particular channel
        for j,jet in enumerate(t.jet4mom):
            if "1lep" in t.electronChannels[i] and "1lep" in t.jetChannels[j]:
                print "I'm using the right electron and the right jet for the '1lep' channel: Ok!"
                print "An example: if for this '1lep' channel I applied overlap removal with dR<0.2," 
                print "when I select '1lep' as here, I can be sure I will not find here any jet and electron closer than dR<0.2."

To see e.g. if an event passed a cut you can also run:
import ROOT
import ATLASWatchMan.Bindings
f=ROOT.TFile("OutputD3PD.root")
treeName='D3PDTree'
t=f.Get(treeName)
nevts=t.GetEntries()
for ievt in range(nevts):
    t.GetEntry(ievt)
    print "evt ",ievt 

    for ichan in range( t.channels.size()):
        print t.channels.at(ichan)
    

-- Main.RenaudBruneliere - 10 Feb 2009
-- Main.JanetDietrich - 20 Mar 2009