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Basic instrumentation for Hall A at Jefferson Lab
Precision Rosenbluth measurement of the proton elastic form factors.
A new Rosenbluth measurement of the proton electromagnetic form factors at Q2 values of 2.64, 3.20, and 4.10 GeV2 is reported, consistent with, and much more precise than, previous Rosen Bluth extractions, but inconsistent with recent polarization transfer measurements of similar precision.
Muon (g-2) Technical Design Report
The Muon (g-2) Experiment, E989 at Fermilab, will measure the muon anomalous magnetic moment a factor-of-four more precisely than was done in E821 at the Brookhaven National Laboratory AGS. The E821…
Scaling tests of the cross section for deeply virtual Compton scattering.
The first measurements of the e[over -->]p-->epgamma cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region are presented, proving that generalized parton distributions (GPDs) are accessible to experiment at moderate Q(2), and the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation.
Measurements of the electric form factor of the neutron up to Q2=3.4 GeV2 using the reaction 3He(e,e'n)pp.
S. Riordan, 2, 3 S.M.R. Wesselmann, J.J.W. Wright, H Yao, and X. Wang, F.A.
Precision measurement of the neutron spin asymmetryA(n)(1) and spin-flavor decomposition in the valence quark region.
The results unambiguously show, for the first time, that A(n)(1) crosses zero around x=0.47 and becomes significantly positive at x= 0.60, which agrees with relativistic constituent quark models and with perturbative quantum chromodynamics analyses based on the earlier data.
Compton-scattering cross section on the proton at high momentum transfer.
Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s=5-11 and -t=2-7 GeV2 with a statistical accuracy of a few percent, and are in fair agreement with the calculations using the handbag mechanism.
Measurements of the elastic electromagnetic form-factor ratio mu(p) G(Ep) /
We present measurements of the ratio of the proton elastic electromagnetic form factors, μ_pG_(Ep)/G_(Mp). The Jefferson Lab Hall A Focal Plane Polarimeter was used to determine the longitudinal and…
Final analysis of proton form factor ratio data at Q(2)=4.0, 4.8, and 5.6 GeV2
Precise measurements of the proton electromagnetic form factor ratio R = mu(p)G(E)(p)/G(M)(p) using the polarization transfer method at Jefferson Lab have revolutionized the understanding of nucleon…
Probing the high momentum component of the deuteron at high Q2.
These experimental reduced cross sections provide direct access to the high momentum component of the deuteron momentum distribution in exclusive deuterons electrodisintegration.