2007/10/31 by G. P. Gilfoyle, Gilfoyle, G. P.
Engineering · Physics and Astronomy · #Asymmetry #Charm (quantum number) #Degrees of freedom (physics and chemistry) #Dipole #FOS: Physical sciences #Form factor (electronics) #Gluon #Hadron #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Magnetic form factor #Neutron #Neutron electric dipole moment #Nuclear physics #Particle physics #Perturbative QCD #Photon #Physics #Proton #Quantum chromodynamics #Quantum mechanics #Quark #Range (aeronautics) #Scaling #Scientific Research and Discoveries #Superconducting Materials and Applications #Virtual particle #hep-ex
paper · pdf · doi:10.48550/arxiv.0710.5919
9 pages, 5 figures, HEPMAD07
arxiv created 2007/10/31 · openalex publication_date 2007/10/31 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The physics program at the Thomas Jefferson National Accelerator Facility includes a strong effort to measure form factors and structure functions to probe the structure of hadronic matter, reveal the nature of confinement, and develop an understanding of atomic nuclei using quark-gluon degrees of freedom. The CLAS detector is a large acceptance device occupying one of the end stations. We discuss here two programs that use CLAS; measuring the magnetic form factor of the neutron and the virtual photon asymmetry of the proton. The form factor has been measured with unprecedented kinematic coverage and precision up to Q2=4.7 GeV2 and is consistent within 5%-10% of the dipole parameterization. The proton virtual photon asymmetry has been measured across a wide range in Bjorken x. The data exceed the SU(6)-symmetric quark prediction and show evidence of a smooth approach to the scaling limit prescribed by perturbative QCD.