Compton polarimetry for the MOLLER Experiment

The MOLLER experiment at Jefferson Lab pushes the boundaries of precision Physics by aiming to

measure the parity violating asymmetry(𝐴PV) in electron-electron(Møller) scattering. The prediction

for 𝐴PV in the current experimental design is ≈33 parts per billion (ppb) and the goal is to measure this

quantity with an overall uncertainty of 0.8 ppb. This measurement depends on the precise determina-

tion of the electron beam’s polarization. Compton polarimetry leverages the scattering of polarized

photons from the electron beam to determine its polarization with unmatched accuracy.

In this talk I will present the crucial role of Compton polarimetry for MOLLER. I’ll delve into the un-

derlying physics principles of Compton scattering and how it translates into a robust measurement

technique within the MOLLER experiment. I will also explore the ongoing research and development

(R&D) efforts to optimize the Compton polarimeter for MOLLER’s precision requirement. This includes

advancements in laser technology, detector design, and data analysis approaches to achieve the sub-

percent level precision required for the success of MOLLER.