Dynamical quark loop light-by-light contribution to muon g-2 within the nonlocal chiral quark model

TL;DR

This paper calculates the hadronic light-by-light scattering contribution to the muon g-2 using a nonlocal chiral quark model, providing a complete leading-order estimate of this correction.

Contribution

It presents the first calculation of the dynamical quark loop light-by-light contribution within the nonlocal chiral quark model, completing the leading-order hadronic light-by-light corrections.

Findings

Quark loop contribution to muon g-2: (11.0±0.9)×10^(-10)

Total hadronic light-by-light contribution: (16.8±1.2)×10^(-10)

Results enhance the precision of theoretical muon g-2 estimates.

Abstract

The hadronic corrections to the muon anomalous magnetic moment a_mu, due to the gauge-invariant set of diagrams with dynamical quark loop light-by-light scattering insertions, are calculated in the framework of the nonlocal chiral quark model. These results complete calculations of all hadronic light-by-light scattering contributions to a_mu in the leading order in the 1/Nc expansion. The result for the quark loop contribution is a_mu^{HLbL,Loop}=(11.0+-0.9)*10^(-10), and the total result is a_mu^{HLbL,NxQM}=(16.8+-1.2)*10^(-10).