[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, Nov. 13, 2017
1:00 p.m.
CEBAF Center, Room L102

Amy Nicholson
University of North Carolina at Chapel Hill


*The Nucleon Axial Charge from QCD*

The axial charge of the nucleon, g_A, is a fundamental quantity in nuclear physics which
governs both nuclear beta decay and the nuclear force, and is extremely well-measured
experimentally. However, its calculation directly from the underlying theory of QCD has
proven frustratingly difficult, calling into question the potential accuracy of lattice
QCD applications to nuclear physics. Here, I present the first lattice QCD calculation
of g_A to a precision of 1% with control over all systematics, highlighting new computational
strategies which have made this calculation possible without the need for next-generation
computing power. I also show that already at this level of precision our calculation can
provide important constraints on beyond the Standard Model physics.

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