Published 2017 | Version v1
Journal article

Q weak: First direct measurement of the proton's weak charge

Description

The Qweak experiment, which took data at Jefferson Lab in the period 2010 - 2012, will precisely determine the weak charge of the proton by measuring the parity-violating asymmetry in elastic e-p scattering at 1.1 GeV using a longitudinally polarized electron beam and a liquid hydrogen target at a low momentum transfer of Q2 = 0.025 (GeV/c)2. The weak charge of the proton is predicted by the Standard Model and any significant deviation would indicate physics beyond the Standard Model. The technical challenges and experimental apparatus for measuring the weak charge of the proton will be discussed, as well as the method of extracting the weak charge of the proton. Finally, the results from a small subset of the data, that has been published, will also be presented. Furthermore an update will be given of the current status of the data analysis.

Availability note (English)

Available from http://www.osti.gov/pages/servlets/purl/1350092; http://www.osti.gov/pages/biblio/1350092; DOE Accepted Manuscript full text, or the publishers Best Available Version will be available free of charge after the embargo period

Additional details

Publishing Information

Journal Title
EPJ. Web of Conferences
Journal Volume
137
Journal Page Range
vp.
ISSN
2100-014X

Conference

Title
12. Quark Confinement and the Hadron Spectrum
Dates
28 Aug - 4 Sep 2016
Place
Thessaloniki (Greece)