A. Aghalaryan

Probing Quark-Gluon Interactions with Transverse Polarized Scattering

K. Slifer, O. Rondon, A. Aghalaryan, A. Ahmidouch et autres

We have extracted QCD matrix elements from our data on doubly polarized inelastic scattering of electrons on nuclei. We find the higher twist matrix element d˜2, which arises strictly from quark-gluon interactions, to be unambiguously nonzero. The data also reveal an isospin …

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Spin Structure Moments of the Proton and Deuteron

K. Slifer, Guy Ron, A. Aghalaryan, A. Ahmidouch et autres

Moments of the spin structure functions g1 and g2 of the proton and deuteron have been measured in the resonance region at intermediate four momentum transfer. We perform a Nachtmann moment analysis of this data, along with isovector and isoscalar combinations, in …

Nachtmann Moments of the Proton and Deuteron Spin Structure Functions

K. Slifer, O. Rondon, A. Aghalaryan, A. Ahmidouch et autres

Proton Spin Structure in the Resonance Region

Frank R. Wesselmann, K. Slifer, S. Tajima, A. Aghalaryan et autres

We have examined the spin structure of the proton in the region of the nucleon resonances ($1.085\text{ }\text{ }\mathrm{GeV}<W<1.910\text{ }\text{ }\mathrm{GeV}$) at an average four momentum transfer of ${Q}^{2}=1.3\text{ }\text{ }{\mathrm{GeV}}^{2}$. Using the Jefferson Lab polarized electron beam, a spectrometer, and a …

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Proton GE/GM from beam-target asymmetry

M. Jones, A. Aghalaryan, A. Ahmidouch, R. A. Asaturyan et autres

The ratio of the proton's electric to magnetic form factor, ${G}_{E}/{G}_{M}$, can be extracted in elastic electron-proton scattering by measuring cross sections, beam-target asymmetry, or recoil polarization. Separate determinations of ${G}_{E}/{G}_{M}$ by cross sections and recoil polarization observables disagree for ${Q}^{2}>1$ (GeV/$c){}^{2}$. …

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Measurements of the neutron electric to magnetic form factor ratio GEn/GMn via the H2 (e→,e'n→) H1 reaction to Q2=1.45 (GeV/ c)2

B. Plaster, Andrei Yu Semenov, A. Aghalaryan, E. Crouse et autres

We report values for the neutron electric to magnetic form factor ratio, ${G}_{\mathit{En}}/{G}_{\mathit{Mn}}$, deduced from measurements of the neutron's recoil polarization in the quasielastic $^{2}\mathrm{H}$$(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{'}\stackrel{\ensuremath{\rightarrow}}{n})$$^{1}\mathrm{H}$ reaction, at three ${Q}^{2}$ values of 0.45, 1.13, and 1.45 (GeV/c)${}^{2}$. The data at ${Q}^{2}=1.13$ and 1.45 …

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The ratio of proton electromagnetic form factors via recoil polarimetry at

G. A. MacLachlan, A. Aghalaryan, A. Ahmidouch, Bryon D. Anderson et autres

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Measurement of the Electric Form Factor of the Neutron at Q2=0.5 and 1.0 GeV2/c2

Glen A. Warren, Frank R. Wesselmann, H. Zhu, P. McKee et autres

The electric form factor of the neutron was determined from measurements of the $\stackrel{\ensuremath{\rightarrow}}{d}(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{\ensuremath{'}}n)p$ reaction for quasielastic kinematics. Polarized electrons were scattered off a polarized deuterated ammonia ($^{15}\mathrm{N}\mathrm{D}_{3}$) target in which the deuteron polarization was perpendicular to the momentum transfer. The scattered …

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Measurements of GEn/GMn from the H2(e→,e′n→)H1 Reaction to Q2=1.45 (GeV/c)2

R. Madey, Andrey A. Semenov, Simon J. Taylor, B. Plaster et autres

We report new measurements of the ratio of the electric form factor to the magnetic form factor of the neutron, ${G}_{E}^{n}/{G}_{M}^{n}$, obtained via recoil polarimetry from the quasielastic $^{2}\mathrm{H}(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{n})^{1}\mathrm{H}$ reaction at ${Q}^{2}$ values of 0.45, 1.13, and $1.45\text{ }(\mathrm{G}\mathrm{e}\mathrm{V}/c{)}^{2}$ with relative statistical …

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Neutron electric form factor up to Q{sup 2} = 1.47 GeV/c{sup 2}

R. Madey, Andrei Yu Semenov, Simon J. Taylor, A. Aghalaryan et autres

The ratio of the electric to the magnetic form factor of the neutron, g /equiv G{sub En}/G{sub Mn} , was measured via recoil polarimetry (R.G. Arnold, C.E. Carlson, F. Gross, Phys. Rev. C 23, 363 (1981)) from the quasielastic {sup 2}H (/mathop(e)/limitse' …

Neutron electric form factor up to Q2 = 1.47 GeV/c2

R. Madey, Andrei Yu Semenov, Simon J. Taylor, A. Aghalaryan et autres

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NEUTRON ELECTRIC FORM FACTOR VIA RECOIL POLARIMETRY

R. Madey, Andrei Yu Semenov, Simon J. Taylor, A. Aghalaryan et autres

The ratio of the electric to the magnetic form factor of the neutron, G_En/G_Mn, was measured via recoil polarimetry from the quasielastic d({pol-e},e'{pol-n)p reaction at three values of Q^2 [viz., 0.45, 1.15 and 1.47 (GeV/c)^2] in Hall C of the Thomas Jefferson …

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