2003/02/28 by Ian C. Cloët, I. C. Cloet, Derek B. Leinweber +2 · 7 citations
Physics and Astronomy · #Baryon #Condensed matter physics #Electron magnetic dipole moment #High-Energy Particle Collisions Research #Lattice (music) #Lattice QCD #Lattice field theory #Magnetic field #Magnetic moment #Magnetization #Neutron magnetic moment #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Quantum mechanics #Quark #hep-ex #hep-lat #nucl-ex #nucl-th
paper · pdf · doi:10.1016/s0370-2693(03)00418-0
published as Phys.Lett.B563:157-164,2003 · 7 pages, 7 figures, RevTex 4; Updated to include a recent experimental result
arxiv created 2003/03/23 · openalex publication_date 2003/05/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Theoretical predictions for the magnetic moments of the physical Delta baryons are extracted from lattice QCD calculations. We utilize finite-range regulated effective field theory that is constructed to have the correct Dirac moment mass dependence in the region where the up and down quark masses are heavy. Of particular interest is the chiral nonanalytic behaviour encountered as the nucleon-pion decay channel opens. We find a Delta++ magnetic moment (at the Delta pole) of 4.99 ± 0.56 μN. This result is within the Particle Data Group range of 3.7-7.5 μN and compares well with the experimental result of Bosshard et al. of 4.52 ± 0.51 ± 0.45 μN. The interplay between the different pion-loop contributions to the Delta+ magnetic moment leads to the surprising result that the proton moment may exceed that of the Delta+, contrary to conventional expectations.