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Beam Charge Asymmetries for Deeply Virtual Compton Scattering on the Proton at CLAS12
E. Voutier, V. Burkert, S. Niccolai +76
The parameterization of the nucleon structure through Generalized Parton Distributions (GPDs) shed a new light on the nucleon internal dynamics. For its direct interpretation, Deep…
First Determination of the 27Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement
QWeak Collaboration, D. Androic, D. S. Armstrong +91
We report the first measurement of the parity-violating elastic electron scattering asymmetry on 27Al. The 27Al elastic asymmetry is A_PV = 2.16 +- 0.11 (stat) +- 0.16 (syst) ppm,…
Deeply virtual Compton scattering using a positron beam in Hall-C at Jefferson Lab
A. Afanasev, I. Albayrak, S. Ali +71
We propose to use the High Momentum Spectrometer of Hall C combined with the Neutral Particle Spectrometer (NPS) to perform high precision measurements of the Deeply Virtual Compto…
Beam charge asymmetries for deeply virtual Compton scattering off the proton
V. Burkert, L. Elouadrhiri, F. -X. Girod +57
The unpolarized and polarized Beam Char\-ge Asymmetries (BCAs) of the $\vv{e}^{\pm}p \to e^{\pm}p γ$ process off unpolarized hydrogen are discussed. The measurement of BCAs with th…
Measurement of the Beam-Normal Single-Spin Asymmetry for Elastic Electron Scattering from C and Al
QWeak Collaboration, D. Androic, D. S. Armstrong +82
We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries on C and Al, obtained with an electron beam polarized tra…
Measurement of deeply virtual Compton scattering off Helium-4 with CLAS at Jefferson Lab
R. Dupré, M. Hattawy, N. A. Baltzell +138
We report on the measurement of the beam spin asymmetry in the deeply virtual Compton scattering off He using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab us…
Measurement of the proton spin structure at long distances
X. Zheng, A. Deur, H. Kang +148
Measuring the spin structure of protons and neutrons tests our understanding of how they arise from quarks and gluons, the fundamental building blocks of nuclear matter. At long di…
Extraction of beam-spin asymmetries from the hard exclusive channel off protons in a wide range of kinematics
S. Diehl, K. Joo, A. Kim +135
We have measured beam-spin asymmetries to extract the moment from the hard exclusive reaction above the resonance region, fo…
An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab
A. Accardi, A. Afanasev, I. Albayrak +227
Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental programs at the next generation of lepton accelerators. In the context…
Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering
QWeak collaboration, D. Androic, D. S. Armstrong +92
A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to the imaginary part of the…
Modified Structure of Protons and Neutrons in Correlated Pairs
B. Schmookler, M. Duer, A. Schmidt +6
The atomic nucleus is made of protons and neutrons (nucleons), that are themselves composed of quarks and gluons. Understanding how the quark-gluon structure of a nucleon bound in…
Probing the core of the strong nuclear interaction
A. Schmidt, J. R. Pybus, R. Weiss +162
The strong nuclear interaction between nucleons (protons and neutrons) is the effective force that holds the atomic nucleus together. This force stems from fundamental interactions…
Precision Measurement of the Weak Charge of the Proton
D. Androic, D. S. Armstrong, A. Asaturyan +96
The fields of particle and nuclear physics have undertaken extensive programs to search for evidence of physics beyond that explained by current theories. The observation of the Hi…
Measurement of Nuclear Transparency Ratios for Protons and Neutrons
M. Duer, O. Hen, E. Piasetzky +6
This paper presents, for the first time, measurements of neutron transparency ratios for nuclei relative to C measured using the (e,e'n) reaction, spanning measured neutron momenta…
Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei
M. Duer, A. Schmidt, J. R. Pybus +11
We measured the triple coincidence A(e,e'np) and A(e,e'pp) reactions on carbon, aluminum, iron, and lead targets at Q2 > 1.5 (GeV/c)2, xB > 1.1 and missing momentum > 400 MeV/c. Th…
Semi-Inclusive target and beam-target asymmetries from 6 GeV electron scattering with CLAS
S. Jawalkar, S. Koirala, H. Avakian +160
We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Accept…
First Exclusive Measurement of Deeply Virtual Compton Scattering off He: Toward the 3D Tomography of Nuclei
M. Hattawy, N. A. Baltzell, R. Dupré +157
We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment used the 6 GeV el…
Measurements of Cross Sections with CLAS at GeV and GeV
E. L. Isupov, V. D. Burkert, D. S. Carman +5
This paper reports new exclusive cross sections for using the CLAS detector at Jefferson Laboratory. These results are presented for the first time at photo…
Target and beam-target spin asymmetries in exclusive pion electroproduction for GeV. II.
P. E. Bosted, A. Kim, K. P. Adhikari +152
Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive electroproduction reaction , expanding an analysis of…
Beam-target double spin asymmetry in quasi-elastic electron scattering off the deuteron with CLAS
Michael Mayer, Sebastian E. Kuhn, the CLAS Collaboration
Quasi-elastic electron scattering on the deuteron is a benchmark reaction to test our understanding of deuteron structure and the properties and interactions of the two nucleons bo…
Target and Beam-Target Spin Asymmetries in Exclusive Pion Electroproduction for GeV. I.
P. E. Bosted, M. J. Amaryan, S. Anefalos Pereira +115
Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive electroproduction reaction . The results were obtained…
Target and Beam-Target Spin Asymmetries in Exclusive and Electroproduction with 1.6 to 5.7 GeV Electrons
P. E. Bosted, A. S. Biselli, S. Careccia +159
Beam-target double spin asymmetries and target single-spin asymmetries in exclusive and electroproduction were obtained from scattering of 1.6 to 5.7 GeV longitudinally…
Measurement of two-photon exchange effect by comparing elastic cross sections
D. Rimal, D. Adikaram, B. A. Raue +142
[Background] The electromagnetic form factors of the proton measured by unpolarized and polarized electron scattering experiments show a significant disagreement that grows with th…
Precise Determination of the Deuteron Spin Structure at Low to Moderate with CLAS and Extraction of the Neutron Contribution
N. Guler, R. G. Fersch, S. E. Kuhn +126
We present the final results for the deuteron spin structure functions obtained from the full data set collected with Jefferson Lab's CLAS in 2000-2001. Polarized electrons with en…