Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-02-11
Phys.Lett. B479 (2000) 167-172
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 2 figures, revtex. Minor typos corrected and reference added
Scientific paper
10.1016/S0370-2693(00)00340-3
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. For forward scattering 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. For backward scattering the fourth-order contribution is much smaller than the third-order piece which is dominated by the anomalous scattering, and so cannot explain the discrepancy between the CPT result and the current best experimental determination.
Birse Michael C.
McGovern Judith A.
Vijaya Kumar K. B.
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