### Session X3: Topics In Nuclear Physics

1:30 PM–3:18 PM, Tuesday, April 15, 2008
Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), Room: St. Louis E

Chair: Richard Casten, Yale University

Abstract ID: BAPS.2008.APR.X3.2

### Abstract: X3.00002 : The strange electromagnetic form factors of the nucleon at low $Q^2$

2:06 PM–2:42 PM

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#### Author:

Jianglai Liu
(California Institute of Technology)

The strange electric and magnetic form factors of the nucleon, $G_{E}^s$ and $G_M^s$, give the contributions of strange quarks to the charge and magnetization distributions of the nucleon, which solely arise from the sea of $s\bar s$. $G_E^s$ and $G_M^s$ can be determined by combining the well-known electromagnetic form factors of the proton and the neutron, $G_{E,M}^{\gamma,p}$ and $G_{E,M}^{\gamma,n}$, with the neutral weak form factors of the proton, $G_{E,M}^{Z,p}$, which can be measured via parity-violating (PV) elastic electron scattering. In the past 10 years, a series of definitive PV electron scattering experiments along with several theoretical studies now provide a basis for extracting precision information on these strange quark contributions. In this talk, I will briefly review the experimental technique, and give a summary of the PV elastic electron scattering measurements (at low momentum transfer in particular). A global analysis to extract $G_E^s$ and $G_M^s$ from the data and the physics implications to the strange sea'' will then be presented.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.APR.X3.2