Spin Polarisabilities of the Nucleon at Nlo in the Chiral Expansion
Abstract
We present a calculation of the fourth-order (NLO) contribution to spin-dependent Compton scattering in heavy-baryon chiral perturbation theory, and we give results for the four spin polarisabilities. No low-energy constants, except for the anomalous magnetic moments of the nucleon, enter at this order. The NLO contributions are as large or larger than the LO pieces, making comparison with experimental determinations questionable. We address the issue of whether one-particle reducible graphs in the heavy baryon theory contribute to the polarisabilities.
- Publication:
-
GDH 2000
- Pub Date:
- February 2001
- DOI:
- 10.1142/9789812811448_0022
- arXiv:
- arXiv:nucl-th/0007015
- Bibcode:
- 2001gdh..conf..199M
- Keywords:
-
- Nuclear Theory
- E-Print:
- 6 pages, 2 figures, talk given at GDH2000, Mainz, June 14-17 2000