Speaker
Description
Parity-violating and time-reversal-violating (PVTV) nuclear interactions govern electric dipole moments of nuclei and play an important role in searches for beyond-Standard-Model physics. Recently, PVTV two- and three-nucleon potentials have been worked out to next-to-next-to-leading order in the chiral effective field theory (EFT) expansion based on pions and nucleons as the only explicit degrees of freedom. We emphasize the usefulness of the explicit treatment of the delta resonance for describing PVTV interactions by performing calculations using the delta-full formulation of chiral EFT. Compared with the delta-less approach, the explicit inclusion of the delta isobar allows one to resum certain types of contributions to the PVTV two-pion exchange two- and three-nucleon potentials without introducing any unknown parameters. We provide the corresponding expressions for the delta contributions in momentum and coordinate spaces and compare the convergence of the EFT expansion in both formulations.
