Precision Measurements of the Nucleon Strange Form Factors at Q2 ~0.1 GeV2
The HAPPEX Collaboration
Abstract
We report new measurements of the parity-violating asymmetry APV in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with <thetalab>~6.0 degrees. The 4He result is APV = (+6.40 +/- 0.23 (stat) +/- 0.12 (syst)) x10-6. The hydrogen result is APV = (-1.58 +/- 0.12 (stat) +/- 0.04 (syst)) x10-6. These results significantly improve constraints on the electric and magnetic strange form factors GEs and GMs. We extract GEs = 0.002 +/- 0.014 +/- 0.007 at <Q2> = 0.077 GeV2, and GEs + 0.09 GMs = 0.007 +/- 0.011 +/- 0.006 at <Q2> = 0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.
Create a lesson
Related papers
Direct measurement of the in-medium η mass spectrum through the γγ decay channel
Y. Matsumura, N. Muramatsu, T. A. Hashimoto et al.
STAR Highlights II: Study of Small Systems and the Search for New, Exotic Physics
Jiangyong Jia
Cluster emission and its impact on the r-process nucleosynthesis
Natalia Thomas, Silvia Bara, Thomas Elias Cocolios et al.
Core Breaking at Low Spin in 68Zn from Nuclear Resonance Fluorescence
S. R. Johnson, R. V. F. Janssens, B. A. Brown et al.
Isoscalar Giant Resonances in the even-A Pd Isotopes
J. Arroyo, U. Garg, T. Furuno et al.
Efficient production of 229m,gTh via neutron capture in VUV-transparent crystals
Zhong-yi Chen, Hao-yang Lan, Di Wu et al.