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Qweak: First Direct Measurement of the Proton’s Weak Charge

Authors :
J. R. Hoskins
V. Tadevosyan
J. Diefenbach
K. Johnston
J. Birchall
S.A. Page
D. S. Armstrong
M. J. McHugh
J. Mei
H. Nuhait
C. A. Davis
M. Elaasar
Juliette Mammei
T. Averett
Wouter Deconinck
J. A. Magee
P. Wang
S. Yang
G.R. Smith
W. R. Falk
P. Zang
H. Mkrtchyan
W. T. H. van Oers
D. G. Meekins
J. Pan
F. Guo
J. Roche
Vladimir Nelyubin
W.D. Ramsay
J. Beaufait
B. Sawatzky
Fatiha Benmokhtar
M.L. Pitt
D. C. Jones
N. Morgan
R. Suleiman
N. Simicevic
V. Tvaskis
R. Michaels
Michael Gericke
B. Waidyawansa
Roger Carlini
J. Leckey
T. A. Forest
R. T. Jones
Jay Benesch
J. M. Finn
J. Balewski
M. M. Dalton
J. Grames
L. Lee
Jean-Francois Rajotte
Dipangkar Dutta
S. Kowalski
L. Z. Ndukum
W. S. Duvall
D. J. Mack
J. W. Martin
A.K. Opper
M. Kargiantoulakis
S.A. Wood
T. Seva
P. Solvignon
G. D. Cates
V. M. Gray
Jongmin Lee
K. Grimm
S. Covrig
A. R. Lee
J. Leacock
R. Mahurin
D.T. Spayde
R. Silwal
A. Mkrtchyan
S.K. Phillips
A. Asaturyan
S. Zhamkochyan
S. MacEwan
E. Korkmaz
J.C. Cornejo
K. E. Myers
P. M. King
K. Bartlett
Darko Androić
A. Subedi
J. A. Dunne
Amrendra Narayan
R. Subedi
D. Gaskell
K.D. Paschke
A. Micherdzinska
M.H. Shabestari
M. K. Jones
W.A. Tobias
C. Gal
R. S. Beminiwattha
M. Poelker
Ross D. Young
J. F. Dowd
S.P. Wells
Source :
EPJ Web of Conferences, Vol 137, p 08005 (2017)
Publication Year :
2017
Publisher :
EDP Sciences, 2017.

Abstract

The Q weak 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 Q 2 = 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.

Details

ISSN :
2100014X
Volume :
137
Database :
OpenAIRE
Journal :
EPJ Web of Conferences
Accession number :
edsair.doi.dedup.....2a6bb54e0e698905a7bf2b1fcf8522db