Hi Sudeep, You do not give enough info. Could you send a very short data file + a very small script showing the problem? You have a class with a member like TLorentzVector Ppho; see this class with members fP.X,Y,Z and fE Rene Brun Sudeep Chatterji wrote: > > Hi Rooters, > We are getting a root file "Egamma.root" from a ntpl file we are using to generate Prompt photon events. In this Ntpl file we are applying PT cut on Photons namely PT>20 GeV. However in the root file we are getting photonPSCPT(nmpc) (PT from supercluster energy) less than 10 GeV. We really don't know what's the reason. Also I would like to know what the following root variables signify: > 1) pho.Ppho.fp.fX > 2) pho.Ppho.fp.fY > 3) pho.Ppho.fp.fZ > 4) pho.Ppho.fE > > With regards, > Sudeep
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