Axial anomaly and the delta_{LT} puzzle

The axial anomaly contribution to generalized longitudinal-transverse polarizability $δ_{LT}^{}$ is calculated within Regge approach. It is shown that the contribution from the exchange of the $a_1^{}(1260)$ Regge trajectory is nontrivial and might have the key role to explain the large difference between the predictions of chiral perturbation theory and the experimental data for the neutron $δ_{LT}^{}$. We also present the prediction for the proton $δ_{LT}^{}$, which will be measured at the Thomas Jefferson National Accelerator Facility in near future.

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