Speaker
Description
The form factors are important physical quantities that characterize
the internal structure of a nucleon. In the classical picture, it
corresponds to the Fourier transform of the nucleon's three-dimensional
density distribution. Among them, the electromagnetic form factors are
the most well-known, with thousands of high-precision experimental data
accumulated to date. The axial form factor is another essential type of
nucleon form factor. It is not only a crucial input for neutrino
oscillation experiments but also plays a significant role in
constraining the nucleon's generalized parton distribution functions.
However, compared to the electromagnetic form factors, the axial form
factor suffers from both a scarcity of data and limited precision.
Traditionally, its measurement relies on neutrino scattering and
near-threshold pion electroproduction, both of which face inherent
limitations. In this talk, I will present a novel measurement scheme and
experimental concept based on high-precision polarized electron beams,
which promises to overcome many of the shortcomings of existing methods.
This experiment is planned to be carried out at Jefferson Lab and is
currently in the design phase.
