Dr Andrej Radzhabov (Institute for System Dynamics and Control Theory SB RAS, Irkutsk)

Hadronic light-by-light contribution to muon anomalous magnetic moment of muon

The electron and muon anomalous magnetic moments (AMM) are measured in experiments and studied  in the Standard Model (SM) with the highest precision accessible in particle physics. The comparison of the measured quantity with the SM prediction for the electron AMM provides the best determination of the fine structure constant. The muon AMM is more sensitive to the appearance of possible effects beyond SM. We present the calculations of hadronic light-by-light scattering contribution to the AMM of muon in the  framework of the nonlocal chiral quark model. Our result leads to the 2.4 sigma difference in values of AMM of muon between the standard model and the experiment.