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Measurement of the Generalized Forward Spin Polarizabilities of the Neutron

010 Collaboration·M. Amarian
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Abstract

The generalized forward spin polarizabilities $γ_0$ and $δ_{LT}$ of the neutron have been extracted for the first time in a $Q^2$ range from 0.1 to 0.9 GeV$^2$. Since $γ_0$ is sensitive to nucleon resonances and $δ_{LT}$ is insensitive to the $Δ$ resonance, it is expected that the pair of forward spin polarizabilities should provide benchmark tests of the current understanding of the chiral dynamics of QCD. The new results on $δ_{LT}$ show significant disagreement with Chiral Perturbation Theory calculations, while the data for $γ_0$ at low $Q^2$ are in good agreement with a next-to-lead order Relativistic Baryon Chiral Perturbation theory calculation. The data show good agreement with the phenomenological MAID model.

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010 Collaboration, M. Amarian. 2004-10-04. Measurement of the Generalized Forward Spin Polarizabilities of the Neutron. https://doi.org/10.1103/physrevlett.93.152301

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