5 papers · 1 filter
Spin polarisability of the nucleon at NLO in the chiral expansion
K. B. Vijaya Kumar, Judith A. McGovern, Michael C. Birse
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, ex…
The Wilson Renormalisation Group Applied to the Potential in NN Scattering
Michael C. Birse, Judith A. McGovern, Keith G. Richardson
Nonrelativistic two-body scattering by a short-ranged potential is studied using the renormalisation group. Two fixed points are identified: a trivial one and one describing system…
Comment on "Suppression of piNN* Coupling and Chiral Symmetry"
Michael C. Birse
Jido, Oka and Hosaka have shown that the p-slash gamma_5 piece of the pion-to-vacuum correlator of two baryon interpolating fields vanishes in the soft-pion limit, as a consequence…
Renormalisation and power counting in effective field theories for nucleon-nucleon scattering
Keith G. Richardson, Michael C. Birse, Judith A. McGovern
The renormalisation of NN scattering in theories with zero-range interactions is examined using a cut-off regularisation and taking the cut-off to infinity. Inclusion of contact in…
Interpolating fields for spin-1 mesons
Michael C. Birse
Three commonly used types of effective theories for vector mesons are shown to correspond to different choices of interpolating field for spin-1 particles and the rules for transfo…