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SYDM: Symposium Dipole Moments - A Tool to Search for New Physics

SYDM 2: Session 2

SYDM 2.3: Group Report

Tuesday, March 24, 2015, 15:50–16:10, C/gHS

The hadronic light-by-light contribution to the anomalous magnetic moment of the muon in a dispersive approach — •Vladyslav Pauk and Marc Vanderhaeghen — JGU Mainz, Germany

The keen interest to the anomalous magnetic moment of muon is motivated by its high potential for probing physics beyond Standard Model. However, the interpretation of the quantity is undermined by large hadronic uncertainties. In view of the new muon (g-2) experiments at Fermilab and at J-PARC, a new dispersive formalism for evaluating the hadronic light-by-light (HLbL) scattering contribution to the muon's anomalous magnetic moment will be presented. We provide a first realistic application of the proposed formalism to the case of pseudoscalar meson pole exchanges. Moreover, it allows for a more straightforward implementation of the experimental data. The ongoing measurements by the BES-III Collaboration will be a crucial input into the presented dispersive formalism.