Axial anomaly and the delta_{LT} puzzle

Abstract

The axial anomaly contribution to generalized longitudinal-transverse polarizability ${\delta }_{LT}^{}$ 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 ${\delta }_{LT}^{}$. We also present the prediction for the proton ${\delta }_{LT}^{}$, which will be measured at the Thomas Jefferson National Accelerator Facility in near future.

5 pages, 3 figures, REVTeX, to be published in Phys. Rev. D

References in corpus (6)

• Spin structure of the nucleon at low energies
• Burkhardt-Cottingham sum rule and forward spin polarizabilities in Heavy Baryon Chiral Perturbation Theory
• Measurement of the Generalized Forward Spin Polarizabilities of the Neutron
• Muon anomalous magnetic moment: a consistency check for the next-to-leading order hadronic contributions
• Moments of Spin Structure Functions: Sum Rules and Polarizabilities
• Low Q2 Measurement of g2p and the LT Spin Polarizability

Cited by in corpus (2)

• Forward doubly-virtual Compton scattering off the nucleon in chiral perturbation theory: II. Spin polarizabilities and moments of polarized structure functions
• The contribution of pseudoscalar and axial-vector mesons to hyperfine structure of muonic hydrogen