[en] The ratio R=σ_L/σ_T in the range 0.1 ≤ x ≤ 0.7 and 0.5 ≤Q² ≤7, were measured for both hydrogen and deuterium targets at SLAC End Station A. This precise measurement looks for higher twist contribution beyond Next to Leading Order QCD and target mass effects. Beam from the Nuclear Physics Injector in SLED and normal mode was used which covered energy range from 3.0 Gev to 10.0 Gev

[en] We report new results on a precision measurement of the ratio R=σ_L/σ_T from hydrogen, deuterium, and beryllium targets for deep inelastic electron scattering in the range 0.1≤x≤0.7 and 0.5≤Q²≤7 (GeV/c)². We find no measurable difference between R^p and R^d. Our results are consistent with, and more precise than, previous SLAC data. At high x, R is somewhat larger than order α_s² pQCD predictions, even when target mass effects are included. (orig.)

[en] The inclusive A(e,e^') cross section for x≅1 was measured on ²H, C, Fe, and Au for momentum transfers Q² from 1 to 6.8 (GeV/c)². The scaling behavior of the data was examined in the region of transition from y scaling to x scaling. Throughout this transitional region, the data exhibit ξ scaling, reminiscent of the Bloom-Gilman duality seen in free nucleon scattering. copyright 1996 The American Physical Society

[en] Quasielastic e-d cross sections have been measured at forward and backward angles. Rosenbluth separations were done to obtain R_L and R_T at Q²=1.75, 2.50, 3.25, and 4.00 (GeV/c)². The neutron form factors G_En and G_Mn have been extracted using a nonrelativistic model. The sensitivity to deuteron wave function, relativistic corrections, and models of the inelastic background are reported. The results for G_Mn are consistent with the dipole form, while G_En is consistent with zero. Comparisons are made to theoretical models based on vector meson dominance, perturbative QCD, and QCD sum rules, as well as constituent quarks

[en] Cross sections for inclusive electron scattering from aluminum have been measured at both forward and backward angles in the kinematic region near x=1 and 1.75< Q²<7 (GeV/c)². The forward-angle data are in good agreement with a recent calculation. Both the data and the calculation show scaling behavior for F₂(ξ,Q²)=νW₂(ξ,Q²) at high Q² for fixed values of the Nachtmann variable ξ. The ratio R=σ_L/σ_T has been extracted for 1.75< Q²<5 (GeV/c)² and is found to decrease with Q² to a value consistent with zero at the highest Q²

[en] The proton elastic electric and magnetic form factors, G_Ep(Q²) and G_Mp(Q²), have been separately measured in the range Q²=1.75 to 8.83 (GeV/c)², more than doubling the Q² range of previous data. Scaled by the dipole fit, G_D(Q²), the results for G_Mp(Q²)/μ_pGD(Q²) decrease smoothly from 1.05 to 0.91, while G_Ep(Q²)/G_D(Q²) is consistent with unity. Comparisons are made to QCD sum rule, diquark, constitutent quark, and vector meson dominance models, none of which agree with all of the new data. The ratio Q²F₂/F₁ approaches a constant value for Q²>3 (GeV/c)²

[en] Measurements of inclusive electron-scattering cross sections using hydrogen and deuterium targets in the region of the Δ(1232) resonance are reported. A global fit to these new data and previous data in the resonance region is also reported for the proton. Transition form factors have been extracted from the proton cross sections for this experiment over the four-momentum transfer squared range 1.64< Q²<6.75 (GeV/c)² and from previous data over the range 2.41< Q²<9.82 (GeV/c)². The results confirm previous reports that the Δ(1232) transition form factor decreases more rapidly with Q² than expected from perturbative QCD. The ratio of σ_n/σ_p in the Δ(1232) resonance region has been extracted from the deuteron data for this experiment in the range 1.64< Q²<3.75 (GeV/c)² and for a previous experiment in the range 2.4< Q²<7.9 (GeV/c)². A study has been made of the model dependence of these results. This ratio σ_n/σ_p for Δ(1232) production is slightly less than unity, while σ_n/σ_p for the nonresonant cross sections is approximately 0.5, which is consistent with deep inelastic scattering results. thinsp copyright 1998 The American Physical Society

[en] The proton elastic form factors G_Ep(Q²) and G_Mp(Q²) have been extracted for Q²=1.75 to 8.83 (GeV/c)² via a Rosenbluth separation to ep elastic cross section measurements in the angular range 13 degree ≤θ≤90 degree. The Q² range covered more than doubles that of the existing data. For Q²<4 (GeV/c)², where the data overlap with previous measurements, the total uncertainties have been reduced to < 14% in G_Ep and < 1.5% in G_Mp. Results for G_Ep(Q²) are consistent with the dipole fit G_D(Q²)=(1+Q²/0.71)^-2, while those for G_Mp(Q²)/μ_pG_D(Q²) decrease smoothly from 1.05 to 0.92. Deviations from form factor scaling are observed up to 20%. The ratio Q²F₂/F₁ is observed to approach a constant value for Q²>3 (GeV/c)². Comparisons are made to vector meson dominance, dimensional scaling, QCD sum rule, diquark, and constituent quark models, none of which fully characterize all the new data

[en] The cross section for quasielastic ¹²C(e,e'p) scattering has been measured at momentum transfer Q²=1, 3, 5, and 6.8 (GeV/c)². The results are consistent with scattering from a single nucleon as the dominant process. The nuclear transparency is obtained and compared with theoretical calculations that incorporate color transparency effects. No significant rise of the transparency with Q² is observed

[en] Cross sections are presented for the reaction ²H(e,e'p)n for momentum transfers in the range 1.2≤Q²≤6.8(GeV/c)² and for missing momenta from 0 to 250 MeV/c. The longitudinal-transverse interference structure function has been separated at Q²=1.2(GeV/c)². The observables are compared to calculations performed in nonrelativistic and relativistic frameworks. The data are best described by a fully relativistic calculation