Krishna S. Kumar



Luc Barrett  

Sayak Chatterjee

Andrew Hurley

Jonathon Mott

Jhin-Ying Su

Steven Zhang


Useful Links


MOLLER at Jefferson Laboratory


SOLID at Jefferson Laboratory



Parity-Violating Electron Scattering at Jefferson Laboratary with 11 GeV  

MOLLER (Measurement of Lepton-Lepton Electroweak Reaction)

A new Department of Energy (DOE) Major Item of Equipment (MIE project) is under construction 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 2.4% 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 MOLLER MIE Project received CD-0 approval in December 2016 and CD-1 Approval in December 2020.   

We are currently in the engineering design phase and anticipate getting CD-2 approval in early 2023, with construction following soon after. We plan to complete installation of the apparatus and begin commissioning the experiment in late 2025.      

  1. ArXiv paper on MOLLER Experiment Motivation

  2. MOLLER Conceptual Design Report

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.

  1. SOLID Pre-Conceptual Design Report