Spin polarisability of the nucleon at NLO in the chiral expansion

Details Spin polarisability of the nucleon at NLO in the chiral expansion Spin polarisability of the nucleon at NLO in the chiral expansion

1999-09-20

arxiv.org/abs/hep-ph/9909442v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages RevTeX, 2 eps figures

Scientific paper

We present a calculation of the fourth-order (NLO) contribution to spin-dependent forward Compton scattering in heavy-baryon chiral perturbation theory. No low-energy constants, except for the anomalous magnetic moments of the nucleon, enter at this order. The fourth-order piece of the spin polarisability of the proton turns out to be almost twice the size of the leading piece, with the opposite sign. This leads to the conclusion that no prediction can currently be made for this quantity.

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