Up to two-loop calculations in HBCPT

McGovern, Judith A.; Birse, Michael C.; Kumar, K. B. Vijaya
March 2000
AIP Conference Proceedings;2000, Vol. 508 Issue 1, p195
Conference Proceeding
We start with a brief introduction to HBCPT, and discuss spin-dependent forward Compton scattering both as a pedagogic example and to present our recent results for the fourth-order contribution. We then present two recent two-loop calculations in HBCPT; the fifth-order contribution to the nucleon mass and the lowest-order contribution of the Wess-Zumino-Witten anomalous Lagrangian to forward spin-dependent Compton scattering. In both cases there are checks on the results which confirm the consistency of HBCPT at two-loop level. While the smallness of the mass correction is encouraging for the convergence of the theory, the fourth-order contribution to the spin polarizability turns out to be very large. © 2000 American Institute of Physics.


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