arXiv:hep-lat/0510067·v1·High Energy Physics — Lattice
An upper limit to the electric dipole moment of the neutron from lattice QCD
B. Alles (INFN Pisa)🇮🇹 · M. D'Elia (U. Genova)🇮🇹 · A. Di Giacomo (U. Pisa)🇮🇹
Abstract
A linear increase with the volume of the topological susceptibility can signal spontaneous breaking of parity and time inversion, due to a nonzero vacuum expectation value of the topological charge. Such a breaking would produce a nonzero electric dipole moment of the neutron, d_n. An upper limit to d_n is derived from numerical simulations at increasing volumes.
Comments: 4 pages, 3 figures, talk presented at QCD05 (Montpellier) 4-9 July