Electromagnetic and spin polarisabilities in lattice QCD
W. Detmold, B.C. Tiburzi, A. Walker-Loud
TL;DR
This paper explores how lattice QCD can be used to calculate nucleon electromagnetic and spin polarisabilities, highlighting the external field method and the importance of extrapolations to match experimental data.
Contribution
It demonstrates the feasibility of extracting all nucleon polarisabilities using lattice QCD and discusses the necessary extrapolations within chiral perturbation theory.
Findings
External field method can measure all nucleon polarisabilities
Strong dependence on lattice volume and quark masses for extrapolations
Method applicable to charged particles' polarisabilities
Abstract
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 chiral perturbation theory, finding a strong dependence on the lattice volume and quark masses.
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Taxonomy
TopicsCold Atom Physics and Bose-Einstein Condensates · Physics of Superconductivity and Magnetism · Quantum Chromodynamics and Particle Interactions