# **at 1pm** Calculating the nucleon axial charge with lattice QCD

Particle Physics Theory seminar

#### **at 1pm** Calculating the nucleon axial charge with lattice QCD

• Event time: 1:00pm
• Event date: 25th April 2018
• Speaker: Christopher Bouchard (University of Glasgow)
• Location: Higgs Centre Seminar Room, Room 4305,

### Event details

The axial charge, $g_A$, is a fundamental property of the nucleon describing its coupling to the weak axial current and controlling the beta decay rate of the neutron.  In principle, $g_A$ is calculable from first principles using lattice QCD.  In fact, the lattice community has been attempting to calculate $g_A$ for two decades.  However, these efforts have been hindered by difficulties related to baryons on the lattice and associated systematic uncertainties.  I will discuss a lattice QCD calculation, performed with members of the CalLat Collaboration, of the nucleon axial charge with unprecedented accuracy and precision, focusing on techniques developed for and used in this calculation to address these difficulties.

### About Particle Physics Theory seminars

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..