Abbott, Brad
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Near threshold electroproduction of the omega meson at Q**2 approx. 0.5-GeV**2.

The Jefferson Laboratory E91-016 collaboration Ambrozewicz, P. ; Mitchell, J. ; Dunne, J. ; et al.
Phys.Rev.C 70 (2004) 035203, 2004.
Inspire Record 645605 DOI 10.17182/hepdata.31643

Electroproduction of the omega meson was investigated in the p(e,e'p)omega reaction. The measurement was performed at a 4-momentum transfer Q2 ~ 0.5 GeV2. Angular distributions of the virtual photon-proton center-of-momentum cross sections have been extracted over the full angular range. These distributions exhibit a strong enhancement over t-channel parity exchange processes in the backward direction. According to a newly developed electroproduction model, this enhancement provides significant evidence of resonance formation in the gamma* p -> omega p reaction channel.

2 data tables match query
Table 1

Differential cross section for an average W of 1.75 GeV.

Table 2

Differential cross section for an average W of 1.79 GeV.


Measurement of tensor polarization elastic electron deuteron scattering at large momentum transfer.

The JLAB t(20) collaboration Abbott, D. ; Ahmidouch, A. ; Anklin, H. ; et al.
Phys.Rev.Lett. 84 (2000) 5053-5057, 2000.
Inspire Record 523086 DOI 10.17182/hepdata.40433

Tensor polarization observables (t20, t21 and t22) have been measured in elastic electron-deuteron scattering for six values of momentum transfer between 0.66 and 1.7 (GeV/c)^2. The experiment was performed at the Jefferson Laboratory in Hall C using the electron HMS Spectrometer, a specially designed deuteron magnetic channel and the recoil deuteron polarimeter POLDER. The new data determine to much larger Q^2 the deuteron charge form factors G_C and G_Q. They are in good agreement with relativistic calculations and disagree with pQCD predictions.

5 data tables match query
Table 1

No description provided.

Table 2

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Table 3

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Longitudinal and transverse cross sections in the H-1(e,e' K+)Lambda reaction.

Niculescu, G. ; Mohring, R.M. ; Gueye, P. ; et al.
Phys.Rev.Lett. 81 (1998) 1805-1808, 1998.
Inspire Record 479881 DOI 10.17182/hepdata.19546

The 1H(e,e′K+)Λ reaction was studied as a function of the squared four-momentum transfer, Q2, and the virtual photon polarization, ɛ. For each of four Q2 settings, 0.52, 0.75, 1.00, and 2.00 (GeV/c)2, the longitudinal and transverse virtual photon cross sections were extracted in measurements at three virtual photon polarizations. The Q2 dependence of the σL/σT ratio differs significantly from current theoretical predictions. This, combined with the precision of the measurement, implies a need for revision of existing calculations.

1 data table match query
Table 1

The systematic and statistical errors are added in quadrature. OMEGA is the solid angle of K+ in CMS.