Strange Quark Contribution to the Proton Spin, from Elastic $\vec{e}p$ and $νp$ Scattering

Details Strange Quark Contribution to the Proton Spin, from Elastic $\vec{e}p$ and $νp$ Scattering Strange Quark Contribution to the Proton Spin, from Elastic $\vec{e}p$ and $νp$ Scattering

2006-11-28

arxiv.org/abs/hep-ex/0611053v1

AIPConf.Proc.915:391-394,2007

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 1 figure; proceedings for SPIN 2006; will be published in AIP Conference Proceedings

Scientific paper

10.1063/1.2750804

The strangeness contribution to the vector and axial form factors of the proton is presented for momentum transfers in the range 0.45 < $Q^2$ < 1.0 GeV$^2$. The results are obtained via a combined analysis of forward-scattering parity-violating elastic $\vec{e}p$ asymmetry data from the G0 and HAPPEx experiments at Jefferson Lab, and elastic $\nu p$ and $\bar{\nu}p$ scattering data from Experiment 734 at Brookhaven National Laboratory. The combination of the two data sets allows for the simultaneous extraction of $G_E^s$, $G_M^s$, and $G_A^s$ over a significant range of $Q^2$ for the very first time. Determination of the strange axial form factor $G_A^s$ is vital to an understanding of the strange quark contribution to the proton spin.

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