Hi all,
I have a problem with TLorentzVector::SetPtEtaPhiE, if I write:
tag_jet1.SetPtEtaPhiE(Pt,Eta,Phi,E);
tag_jet2.SetPtEtaPhiE(Pt,Eta,Phi,E);
dijet = tag_jet1 + tag_jet2;
mass = dijet.M();
I obtain negative mass.
where is my mistake, do you have any idea?
Thank you
Ciccio