The MOLLER Experiment:
The MOLLER collaboration proposes to measure the parity-violating asymmetry in polarized electron-electron (Møller) scattering, at a beam energy of 11 GeV. In the Standard Model, the predicted asymmetry is due to the interference between the electromagnetic amplitude and the weak neutral current amplitude, the latter being mediated by the Z0 boson. The size of the asymmetry is predicted to be 33 parts per billion (ppb) at our kinematics. Our goal is to measure it to a precision of 0.7 ppb. The result would yield a measurement of the Weak charge of the electron to a fractional accuracy of 2.4% at an average Q2 of 0.0056 GeV2. At the proposed accuracy, this measurement constitutes a sensitive test of new physics beyond the Standard Model. MOLLER is proposed to run in Hall A at Jefferson Laboratory after the 12 GeV upgrade of the facility
The University of Manitoba subatomic physics is actively contributing to the design, simulation, and construction of the experiment. Specifically, we are work package leaders for the spectrometer design and the main integrating detector system.
More detailed information about the experiment and our work on it can obtained by following the menu links at the top of the page.