Qweak - “A Search for New Physics” Status Update with Preliminary Results
J. P. Leckey 1*
1 College of William and Mary
Qweak is a currently running experiment at the Thomas Jefferson National Accelerator Facility that uses parity-violating elastic electron-proton scattering to measure the weak charge of the proton (QPweak). This experiment is a sensitive test for physics beyond the standard model, as QPweak is well predicted in the Standard Model. Qweak will measure an expected ~200 ppb asymmetry to 4 % and will be the first direct measurement of QPweak. The precision generated will allow the probing of new physics up to 2.5 TeV. Longitudinally polarized electrons are scattered off a liquid hydrogen target and pass through a toroidal-field magnetic spectrometer. The 4 % measurement requires 2500 hours of 85 % polarized electron beam. In this talk, I will outline the design and status of the complete experiment and discuss the details of the asymmetry measurements as well as the preliminary results from several studies of experimental systematics.