vector

Use when computing 4-vector quantities in Python: invariant mass, deltaR, transverse momentum, boost, or any Lorentz vector arithmetic over collections of particles. Also use when registering scikit-hep vector behaviors on awkward-array records so that ak.zip objects gain Momentum4D methods, or when constructing vector objects from (pt, phi, eta, mass) or (px, py, pz, energy) field conventions.