An optimized basis for hadronic light-by-light scattering
Abstract We present a new basis for the hadronic light-by-light (HLbL) tensor that is optimized for the evaluation of Watch Box narrow-resonance contributions to HLbL scattering in the anomalous magnetic moment of the muon.As main advantage, kinematic singularities are manifestly absent for pseudoscalar, scalar, and axial-vector states, while the r