ref: https://root.cern.ch/doc/master/GenVector_2LorentzVector_8h_source.html#l00495

idk why we didn't do the naive px^2 + py^2, because that seems to be correct

Hi @Moelf,

Thanks for the great package!
We would like to have a function for creating LorentzVectors from PT, Eta, Phi, Energy, i.e., something like:

function LorentzVectorCylE(pt, eta, phi, E)
    m2 = E^2 - pt^2 - (sinh(eta) * pt)^2
    m = sign(m2) * sqrt(abs(m2)) 
    return LorentzVectorCyl(pt, eta, phi, m) 
  end

(Similar to ROOT's SetPTEtaPhiE method)
I don't know if this is the best way to do it or if it would make sense to have more general functions for converting energies and masses, for example to use it both for cartesian and cylindrical LorentzVectors.

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