Overview of the Tracking System and Kinematics Measurements for the MOLLER Experiment

MOLLER (Measurement Of a Lepton-Lepton Electroweak Reaction) is a parity-violating experiment set to begin data-taking in Jefferson Laboratory’s experimental Hall A in 2025. The parity-violating asymmetry of Møller scattered electrons, A_PV , will be measured and used to extract the weak charge of the electron, Q_W^e , to never before seen levels of precision. At tree level, the overall factor that correlates Q_W^e to A_PV is called the kinematic factor, Α, and is dependent on the incoming beam energy and center of mass scattering angle of the electron. A vital component of MOLLER will be its tracking system which will be used for kinematics measurements and will allow us to determine the kinematic factor and its uncertainty, as well as to monitor backgrounds and verify detector response.

Calibration of our tracking system and verification of our kinematics must be completed in order to calculate Q_W^e to the desired level of precision. This talk will overview the tracking system and the plan for our kinematics measurements. Specifically a brief overview will be given for the following subsystems: the ¹²C foil targets, the sieve and blocker collimators, the trigger scintillator system, the gas electron multiplier tracking detectors, and the pion detector system.