Speaker
Andre Walker-Loud
Description
The parity violating neutral current is the least well understood of all currents in the Standard Model. At low energies, these weak interactions manifest as short distance, 4-fermion operators. Unlike their flavor-changing charged counterparts, which are easy to detect experimentally, the neutral current interactions exist in the background of the strong interactions with a typical strength of $G_F F_\pi^2 \sim 10^{-7}$, where $F_\pi\sim92$ MeV is the pion decay constant, a typical hadronic scale. Therefore, despite major efforts, there are very few measurements of the hadronic neutral weak interaction. Lattice QCD is a non-perturbative regulator for QCD, the fundamental theory of strong interactions, and provides a rigorous tool with which to compute the strength of the hadronic neutral current in the simplest hadronic and nuclear systems. I will describe a long-term effort aimed at understanding hadronic parity violation from QCD. One of the simplest systems to use lattice QCD for, the iso-tensor hadronic parity violating NN amplitude, is one of the most promising for shedding light on our current understanding. I will motivate the need and application of lattice QCD for understanding hadronic parity violation from the Standard Model and highlight related lattice QCD results.
| [email protected] | |
| Collaboration name | CalLat |
| Funding source | DOE |
