MENU-2019

Jun 2 – 7, 2019
Carnegie Mellon University
America/New_York timezone

A percent-level determination of the nucleon axial coupling from Quantum Chromodynamics.

Jun 7, 2019, 9:45 AM
30m
Rangos 3

Rangos 3

Electroweak Probes

Speaker

Henry Monge Camacho (UNC at Chapel Hill)

Description

The nucleon axial charge $g_A$, measures the strength of the coupling of the axial current of the standard model to the nucleon, controlling the rate of beta decay, for example. A determination of $g_A$ directly from QCD is complicated by the non-perturbative nature of QCD, but is important for benchmarking the application of lattice QCD to problems in nuclear physics, and for aiding in precision tests of the standard model. I will present the first per-cent-level determination of $g_A$ using lattice QCD, which was made possible through the use of an unconventional computing strategy inspired by the Feynman-Hellmann Theorem. I will summarize the robustness of our result to all systematic variations that arise in the lattice QCD calculation. Our published result is $g_A^{QCD} = 1.2711(13)$.

Early Consideration No No

Primary author

Henry Monge Camacho (UNC at Chapel Hill)

Co-author

André Walker-Loud (Lawrence Berkeley National Laboratory)