EPJ Web Conf.
Volume 137, 2017XIIth Quark Confinement and the Hadron Spectrum
|Number of page(s)||8|
|Section||Section E: QCD and New Physics|
|Published online||22 March 2017|
Qweak: First Direct Measurement of the Proton’s Weak Charge
1 University of Zagreb, Zagreb, HR 10002 Croatia
2 College of William and Mary, Williamsburg, VA 23185 USA
3 A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), Yerevan 0036, Armenia
4 Massachusetts Institute of Technology, Cambridge, MA 02139 USA
5 Thomas Jefferson National Accelerator Facility, Newport News, VA 23606 USA
6 Ohio University, Athens, OH 45701 USA
7 Christopher Newport University, Newport News, VA 23606 USA
8 University of Manitoba, Winnipeg, MB R3T2N2 Canada
9 University of Virginia, Charlottesville, VA 22903 USA
10 TRIUMF, Vancouver, BC V6T2A3 Canada
11 Hampton University, Hampton, VA 23668 USA
12 Mississippi State University, Mississippi State, MS 39762 USA
13 Virginia Polytechnic Institute & State University, Blacksburg, VA 24061 USA
14 Southern University at New Orleans, New Orleans, LA 70126 USA
15 Idaho State University, Pocatello, ID 83209 USA
16 Louisiana Tech University, Ruston, LA 71272 USA
17 University of Connecticut, Storrs-Mansfield, CT 06269 USA
18 University of Northern British Columbia, Prince George, BC V2N4Z9 Canada
19 University of Winnipeg, Winnipeg, MB R3B2E9 Canada
20 George Washington University, Washington, DC 20052 USA
21 University of New Hampshire, Durham, NH 03824 USA
22 Hendrix College, Conway, AR 72032 USA
23 University of Adelaide, Adelaide, SA 5005 Australia
24 Syracuse University, Syracuse, NY 13210 USA
a e-mail: email@example.com
Published online: 22 March 2017
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. 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.
© The Authors, published by EDP Sciences, 2017
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