Conveners
Tests of Fundamental Symmetries
- Rajan Gupta (Los Alamos National Lab)
We present results of a study of spontaneous symmetry breaking through fermion bilinear condensation in the single flavor Thirring Model in 2+1$d$. Domain Wall Fermions are used to capture the symmetry breaking pattern U(2)$\to$U(1)$\otimes$U(1) in the limit of domain wall separation $L_s\to\infty$, with the conserved fermion current coupled to a real vector auxiliary field defined throughout...
The RBC & UKQCD collaborations have successfully employed G-parity boundary conditions in the measurement of $K\to\pi\pi$ decays to obtain a physical decay with the two-pion ground state, at the cost of a significant increase in computational expense. We report on new theoretical/algorithmic developments based upon the properties of the Dirac operator under complex conjugation that have been...
When calculating hadronic matrix elements using a lattice regulator,
the presence of power divergences in the lattice spacing poses a significant challenge.
Non-perturbatively subtracting these power divergences presents
both theoretical and numerical difficulties.
The gradient flow offers a theoretically sound and numerically robust approach
for renormalizing power divergences.
We...
The measurements of nucleon Electric Dipole Moments (EDMs) are important to probe CP violation and physics beyond the Standard Model. In this talk, I will report our recent progress in calculating nucleon theta EMDs using background electric field. We extract neutron EMDs by measuring the energy shift of 2pt correlation function in the presence of background field. The gauge ensembles are...
We present results from our lattice QCD study of the contribution of the isovector quark chromo-electric dipole moment (qcEDM) operator to the nucleon electric dipole moments (nEDM). The calculation was carried out on four 2+1+1-flavor of highly improved staggered quark (HISQ) ensembles using Wilson-clover quarks to construct correlation functions. We use the non-singlet axial Ward identity...
Neutrinoless double beta decay is a hypothetical beyond the Standard Model (BSM) process that, if observed, would imply that neutrinos are Majorana particles. Interpreting the results of double beta decay experiments requires knowledge of nuclear matrix elements that are calculable with lattice QCD. This talk presents determinations of the long-distance (mediated by a light Majorana neutrino)...