Electromagnetic and spin polarisabilities in lattice QCD

William Detmold
2006 Proceedings of XXIVth International Symposium on Lattice Field Theory — PoS(LAT2006)   unpublished
We discuss the extraction of the electromagnetic and spin polarisabilities of nucleons from lattice QCD. We show that the external field method can be used to measure all the electromagnetic and spin polarisabilities including those of charged particles. We then turn to the extrapolations required to connect such calculations to experiment in the context of finite volume chiral perturbation theory. We derive results relevant for lattice simulations of QCD, partially-quenched QCD and quenched
more » ... QCD and quenched QCD. Our results for the polarisabilities show a strong dependence on the lattice volume and quark masses, typically differing from the infinite volume limit by ∼ 10% for current lattice volumes and quark masses.
doi:10.22323/1.032.0103 fatcat:gwmy6x2uinflxjff2wh5bozfva