Qweak: A search for new physics status update

Abstract:

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 pbkp_redicted 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 certain classes 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 paper, the design and status of the complete experiment including the details of the asymmetry measurements will be discussed.

Año de publicación:

2012

Keywords:

Fuente:

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