Measurement of the Strange Quark Contribution to Proton Structure through Parity Violating Electron-Proton Scattering Page: 3 of 188
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The G (G-Zero) forward angle experiment completed in Hall C of the Thomas Jefferson National
Accelerator Facility (TJNAF) has measured the parity violating asymmetries in elastic electron-
proton scattering over a Q2 range of 0.12 < Q2 < 1.0 (GeV/c)2. A linear combination of the strange
electric (GE) and magnetic (GM) form factors calculated from these asymmetries indicate a non-
zero contribution of the strange quark to the charge and magnetization structure of the proton in
the above kinematic range at a 89% confidence level. The results show a previously unmeasured Q2
dependence of the strange form factors. Combining the G results with previous parity violating
experiments show that at Q2 = 0.1 (GeV/c)2
GM = 0.62 + 0.31
GE = -0.013 + 0.028
At intermediate Q2 of about 0.23 (GeV/c)2, a consistent value of GM is seen compared to
previous experiments, together with a measurement that may imply a negative value of GE. For
Q2 above 0.5 (GeV/c)2 a consistently positive value for the linear combination of the strange form
factors is seen.
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Nakahara, Kazutaka. Measurement of the Strange Quark Contribution to Proton Structure through Parity Violating Electron-Proton Scattering, thesis or dissertation, May 1, 2006; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc887297/m1/3/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.