Speaker
Summary
Contribution of processes of light by light scattering into anomalous magnetic moment (AMM) of muon lies in low energy region where the perturbative methods of QCD are not applicable. We should to account nonperturbative effects of vacuum QCD. Nonlocal quark model is a good example of quark model that can make the evaluation of hadronic contribution in AMM of muon.
The total contribution in zero order by 1/Nc is estimated as\
[
a^{HLbL}_{\mu} = 16.8(1.25)\cdot 10^{-10}
]
Both degrees of freedom is payed a role in this processes: mesons and quarks.
For solving the puzzle of LbL contribution, we should
to better understanding the physics of strong interaction
at long distance and have a model-independent evaluations needed and more precision data on different
meson decays.
