Can someone tell me if there is a member function in GsfElectron to get the four-vector instead of extracting, the information of E, px, py, pz separately?
Yes, if you dig deep in the CMSSW reference documentation for reco::GsfElectron, down to the member functions inherited from reco::LeafCandidate, you’ll find that there’s p4() which is of type LorentzVector.
Define the type of the object as reco::Candidate::LorentzVector.
Best,
Kati
for the CMS open data team
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