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Hadronic light-by-light scattering contribution to the muon <i>g</i> โ 2
We review recent developments concerning the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon. We first discuss why fully off-shell hadronic form factors should be used for the evaluation of this contribution to the g โ 2. We then reevaluate the numerically dominant pion-exchange contribution in โฆ