Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-24
Int.J.Mod.Phys. A21 (2006) 3947-3966
Physics
High Energy Physics
High Energy Physics - Phenomenology
21pages, title changed, minimal corrections
Scientific paper
10.1142/S0217751X06031521
We have constructed a heavy baryon effective field theory with photon as an external field in accordance with the symmetry requirements similar to the heavy quark effective field theory. By treating the heavy baryon and anti-baryon equally on the same footing in the effective field theory, we have calculated the spin polarisabilities $\gamma_i, i=1...4$ of the nucleon at third order and at fourth-order of the spin-dependent Compton scattering. At leading order (LO), our results agree with the corresponding results of the heavy baryon chiral perturbation theory, at the next-to-leading order(NLO) the results show a large correction to the ones in the heavy baryon chiral perturbation theory due to baryon-antibaryon coupling terms. The low energy theorem is satisfied both at LO and at NLO. The contributions arising from the heavy baryon-antibaryon vertex were found to be significant and the results of the polarisabilities obtained from our theory is much closer to the experimental data.
Ma Yong-Liang
Vijaya Kumar K. B.
Wu Yue-Liang
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