Parity-Violating Moller Scattering at 11 GeV: MOLLER (Measurement of Lepton-Lepton Electroweak Reaction)
A new proposal has been developed to measure the parity-violating asymmetry in the scattering of longitudinally polarized 11 GeV electrons from the atomic electrons in a liquid hydrogen target. Our goal is to measure the tiny asymmetry of about 35 parts per billion to 2.3% of itself. This would measure the weak mixing angle, a fundamental parameter of the electroweak theory, to an accuracy close to 0.1%, approaching the accuracy of the two best measurements at high energy colliders. This provides indirect access ot new dynamics at multi-TeV scales, in a manner complementary to direct searches at the Large Hadron Collider.
The proposal received full approval from the Jefferson Laboratory Program Advisory Committee in January 2009. The project has also undergone a Director's review chaired by Charles Prescott in January 2010.
We are working towards funding, detailed technical design and an R& D plan of the apparatus, with the long term goal of getting the experiment constructed between 2014-16.
Parity-Violating Deep Inelastic Scattering: SoLID (Solenoidal Large Intensity Device)
A new proposal has been developed to measure the parity-violating asymmetry in the deep inelastic scattering of polarized electrons off a liquid deuterium target. The goal is to improve our knowledge of lepton-quark weak neutral current coupling constants; one particular linear combination of these constants would improve by more than a factor of 30. Such a measurement would provide unique information on possible new dynamics at the TeV scale in a manner complementary to direct searches at the Large Hadron Collider.
The centerpiece of the proposal is a new spectrometer, called SoLID, which is based on a large solenoidal manget. Some details of the proposed solenoidal spectrometer simulations can be found here.
The proposal received conditional approval from the Jefferson Laboratory Program Advisory Committee in January 2009. We resubmitted the proposal in December 2009 and the project received full approval from the PAC.
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Abstract of proposal
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Full proposal