MicroBooNE Document 2038-v1

Strange Quark Contribution to the Nucleon Spin from Electroweak Elastic Scattering Data

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External Presentations
Submitted by:
Stephen Pate
Updated by:
Stephen Pate
Document Created:
03 Jun 2012, 09:32
Contents Revised:
03 Jun 2012, 09:32
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03 Jun 2012, 09:32
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The total contribution of strange quarks to the intrinsic spin of the nucleon can be determined from a measurement of the strange-quark contribution to the nucleon's elastic axial form factor. We have studied the strangeness contribution to the elastic vector and axial form factors of the nucleon, using elastic electroweak scattering data.
Specifically, we combine elastic $\nu p$ and $\bar{\nu} p$ scattering cross section data from the Brookhaven E734 experiment with elastic $ep$ and quasi-elastic $ed$ and $e$-$^4$He scattering parity-violating asymmetry data from the SAMPLE, HAPPEx, G0 and PVA4 experiments. We have not only determined these form factors at individual values of momentum-transfer ($Q^2$), but also have fit the $Q^2$-dependence of these form factors using simple functional forms. We present the results of these fits, along with some expectations of how our knowledge of these form factors can be improved with data from Fermilab experiments.
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Talk given at CIPANP2012
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