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06.11.2023 / 13:15 - 14:15 / Zeuthen, Campus Adlershof HU IRIS-Building
Lattice seminarProton and neutron electromagnetic form factors and radii from lattice QCD (2/12)
Miguel Salg (Johannes Gutenberg-Universität Mainz)
We present results for the electromagnetic form factors of the proton and neutron computed on the (2 + 1)-flavor Coordinated Lattice Simulations (CLS) ensembles including both quark-connected and -disconnected contributions. The -, pion-mass, lattice-spacing, and finite-volume dependence of our form factor data is fitted simultaneously to the expressions resulting from covariant chiral perturbation theory including vector mesons amended by models for lattice artefacts. From these fits, we determine the electric and magnetic radii and the magnetic moments of the proton and neutron. Moreover, we compute the Zemach radius of the proton from an extrapolation of our results for the electromagnetic form factors to arbitrarily large momenta. To assess the influence of systematic effects, we average over various cuts in the pion mass and the momentum transfer, as well as over different models for the lattice-spacing and finite-volume dependence, using weights derived from the Akaike Information Criterion (AIC).
More Information: https://indico.desy.de/event/41410/
