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Title: The tracking analysis in the Q-weak experiment

Here, the Q-weak experiment at Jefferson Laboratory measured the parity violating asymmetry (A$$_{PV}$$ ) in elastic electron-proton scattering at small momentum transfer squared (Q$$^{2}$$=0.025 (G e V/c)$$^{2}$$), with the aim of extracting the proton’s weak charge ( $${Q^p_W}$$ ) to an accuracy of 5 %. As one of the major uncertainty contribution sources to $${Q^p_W}$$ , Q$$^{2}$$ needs to be determined to ~1 % so as to reach the proposed experimental precision. For this purpose, two sets of high resolution tracking chambers were employed in the experiment, to measure tracks before and after the magnetic spectrometer. Data collected by the tracking system were then reconstructed with dedicated software into individual electron trajectories for experimental kinematics determination. The Q-weak kinematics and the analysis scheme for tracking data are briefly described here. The sources that contribute to the uncertainty of Q$$^{2}$$ are discussed, and the current analysis status is reported.
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Publication Date:
Report Number(s):
JLAB-PHY-16-2372; DOE/OR/23177-4060
Journal ID: ISSN 0304-3843; PII: 1369; TRN: US1701235
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Hyperfine Interactions
Additional Journal Information:
Journal Volume: 237; Journal Issue: 1; Conference: SSP 2015, Victoria, BC (Canada), 8-12 Jun 2015; Journal ID: ISSN 0304-3843
Publisher:
Springer
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
Q-weak Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; parity violating asymmetry; momentum transfer; kinematics
OSTI Identifier:
1341001