Computing nucleon EDM on a lattice

¹ Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
² Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
³ Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
⁴ RIKEN/BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
⁵ Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
⁶ Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA

^* Speaker, e-mail: sergey.syritsyn@stonybrook.edu

Published online: 26 March 2018

Abstract

I will discuss briefly recent changes in the methodology of computing the baryon EDM on a lattice. The associated correction substantially reduces presently existing lattice values for the proton and neutron theta-induced EDMs, so that even the most precise previous lattice results become consistent with zero. On one hand, this change removes previous disagreements between these lattice results and the phenomenological estimates of the nucleon EDM. On the other hand, the nucleon EDM becomes much harder to compute on a lattice. In addition, I will review the progress in computing quark chromo-EDM-induced nucleon EDM using chiral quark action.