Measurement of the Strange Quark Contribution to Nucleon Structure Through Parity-Violating Electron Scattering

Thesis/Dissertation · Thu Dec 31 23:00:00 EST 2009

DOI:https://doi.org/10.2172/989186· OSTI ID:989186

Ellis, Colleen ^[1]

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1. Univ. of Maryland, College Park, MD (United States)

The G⁰ backward angle experiment, completed in Hall C of the Thomas Jefferson National Accelerator Facility (TJNAF), measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q² = 0.22 and 0.63 (GeV/c)². The asymmetries are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of ≤ 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. This was also the first measurement of the anapole moment effects in the axial-vector current at these four-momentum transfers.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 989186
• Report Number(s): JLAB-PHY--10-1226; DOE/OR/23177--1293
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
AXIAL-VECTOR CURRENTS
CEBAF ACCELERATOR
ELECTRONS
FORM FACTORS
FOUR MOMENTUM TRANSFER
NUCLEONS
QUARKS
SCATTERING