Publications (52)
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,…
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…
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 $γ^* p \to p Ï^0$, expanding an analysis…
First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12
H. Avakian, T. B. Hayward, A. Kotzinian +153
We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opp…
Deeply virtual Compton scattering cross section at high Bjorken
F. Georges, M. N. H. Rashad, A. Stefanko +159
We report high-precision measurements of the Deeply Virtual Compton Scattering (DVCS) cross section at high values of the Bjorken variable . DVCS is sensitive to the Generaliz…
First CLAS12 measurement of DVCS beam-spin asymmetries in the extended valence region
CLAS Collaboration, G. Christiaens, M. Defurne +168
Deeply virtual Compton scattering (DVCS) allows one to probe Generalized Parton Distributions (GPDs) describing the 3D structure of the nucleon. We report the first measurement of…
First-time measurement of Timelike Compton Scattering
P. Chatagnon, S. Niccolai, S. Stepanyan +146
We present the first measurement of the Timelike Compton Scattering process, $γp\to p^\prime γ^* (γ^*\to e^+e^-) $, obtained with the CLAS12 detector at Jefferson Lab. The photo…
Observation of azimuth-dependent suppression of hadron pairs in electron scattering off nuclei
S. J. Paul, S. Moran, M. Arratia +142
We present the first measurement of di-hadron angular correlations in electron-nucleus scattering. The data were taken with the CLAS detector and a 5.0 GeV electron beam incident o…
Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering
M. E. Christy, T. Gautam, L. Ou +167
We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q) up to 15.75~\gevsq. Combined with existing data, these p…
Differential cross sections for Î(1520) using photoproduction at CLAS
U. Shrestha, T. Chetry, C. Djalali +130
The reaction using photoproduction data from the CLAS experiment at Jefferson Lab is studied. The decay of into two exclusive chan…
Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering
M. Hattawy, N. A. Baltzell, R. Dupré +125
In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investi…
Differential Cross Section Measurements for Above the First Nucleon Resonance Region
P. T. Mattione, D. S. Carman, I. I. Strakovsky +145
The quasi-free differential cross section has been measured with CLAS at photon beam energies from 0.445 GeV to 2.510 GeV (corresponding to from 1.311…
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…
Double Photoproduction off the Proton at CLAS
S. Chandavar, J. T. Goetz, K. Hicks +124
The (1500) meson resonance is one of several contenders to have significant mixing with the lightest glueball. This resonance is well established from several previous experim…
First Measurement of Electroproduction off Nuclei in the Current and Target Fragmentation Regions
T. Chetry, L. El Fassi, W. K. Brooks +151
We report results of hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Conti…
Beam Spin Asymmetry Measurements of Deeply Virtual Production with CLAS12
A. Kim, S. Diehl, K. Joo +154
The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive production in a wide kinematic region with the photon virtualities $…
Measurement of the beam asymmetry and the target asymmetry in the photoproduction of mesons off the proton using CLAS at Jefferson Laboratory
P. Roy, Z. Akbar, S. Park +143
The photoproduction of mesons off the proton has been studied in the reaction using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (F…
Beam-Recoil Transferred Polarization in Electroproduction in the Nucleon Resonance Region with CLAS12
D. S. Carman, A. D'Angelo, L. Lanza +138
Beam-recoil transferred polarizations for the exclusive electroproduction of and final states from an unpolarized proton target have been measured using the CLAS1…
Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report
R. Abdul Khalek, A. Accardi, J. Adam +410
This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The…
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…
Neutron DVCS Measurements with BONuS12 in CLAS12
M. Hattawy, M. Amaryan, S. Bültmann +27
The three-dimensional picture of quarks and gluons in the nucleon is set to be revealed through deeply virtual Compton scattering (DVCS). With the absence of a free neutron target,…
Measurement of Target and Double-spin Asymmetries for the Reaction in the Nucleon Resonance Region at Low
X. Zheng, K. P. Adhikari, P. Bosted +147
We report measurements of target- and double-spin asymmetries for the exclusive channel in the nucleon resonance region at Jefferson Lab using the CEBAF…
Multidimensional, high precision measurements of beam single spin asymmetries in semi-inclusive electroproduction off protons in the valence region
S. Diehl, A. Kim, G. Angelini +153
High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6~GeV i…
Beam spin asymmetry in semi-inclusive electroproduction of a hadron pair
M. Mirazita, H. Avakian, A. Courtoy +140
A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and…
Measurement of the Q^2 Dependence of the Deuteron Spin Structure Function g_1 and its Moments at Low Q^2 with CLAS
K. P. Adhikari, A. Deur, L. El Fassi +145
We measured the spin structure function of the deuteron at low , where QCD can be approximated with chiral perturbation theory (PT). The data cover the resonance r…
Measurement of the helicity asymmetry in photoproduction
Z. Akbar, P. Roy, S. Park +131
The double-polarization observable was studied for the reaction using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Acc…
Improved Elastic Scattering Cross Sections Between 0.9 and 2.0 GeV/c and Connections to the Neutron Star Equation of State
CLAS Collaboration, J. Rowley, N. Compton +143
Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the…
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…
First results on nucleon resonance photocouplings from the reaction
CLAS Collaboration, E. Golovatch, V. D. Burkert +127
We report the first experimental measurements of the nine 1-fold differential cross sections for the reaction, obtained with the CLAS detector at Jefferson Labo…
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 t…
Beam-Target Helicity Asymmetry in and Photoproduction on the Neutron
CLAS Collaboration, D. H. Ho, R. A. Schumacher +146
We report the first measurements of the beam-target helicity asymmetry for the , and channels in the energy range 1.702.34…
Target and Double Spin Asymmetries of Deeply Virtual Production with a Longitudinally Polarized Proton Target and CLAS
A. Kim, H. Avakian, V. Burkert +126
The target and double spin asymmetries of the exclusive pseudoscalar channel were measured for the first time in the deep-inelastic regime using a longitud…
Exclusive electroproduction off protons in the resonance region at photon virtualities 0.4~GeV ~GeV
N. Markov, K. Joo, V. D. Burkert +120
The exclusive electroproduction process was measured in the range of photon virtualities ~GeV and the invariant mass range of t…
Photoproduction of mesons off the proton for GeV using CLAS at Jefferson Laboratory
T. Hu, Z. Akbar, V. Crede +148
Photoproduction cross sections are reported for the reaction using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The mesons are detecte…
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…
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…
Photon beam asymmetry in the reaction for = 1.152 to 1.876 GeV
CLAS Collaboration, P. Collins, B. G. Ritchie +147
Photon beam asymmetry measurements for photoproduction in the reaction are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using…
Photon beam asymmetry for and photoproduction from the proton
P. Collins, B. G. Ritchie, M. Dugger +140
Measurements of the linearly-polarized photon beam asymmetry for photoproduction from the proton of and mesons are reported. A linearly-polarized tagged photo…
Exclusive Electroproduction off the Neutron in Deuterium in the Resonance Region
Y. Tian, R. W. Gothe, V. I. Mokeev +140
New results for the exclusive and quasi-free cross sections off neutrons bound in deuterium are presented over a wide final state hadron angle ra…
Measurement of charged-pion production in deep-inelastic scattering off nuclei with the CLAS detector
S. Moran, R. Dupre, H. Hakobyan +141
Background: Energetic quarks in nuclear DIS propagate through the nuclear medium. Processes that are believed to occur inside nuclei include quark energy loss through medium-stimul…
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 longitudinal…
The Beam-Target Helicity Asymmetry for in the {\bf{} Resonance Region
D. Ho, P. Peng, C. Bass +140
We report the first beam-target double-polarization asymmetries in the reaction spanning the nucleon resonance region from invariant mass = $1…
First Measurements of the Double-Polarization Observables , , and in Photoproduction off Transversely Polarized Protons in the Resonance Region
P. Roy, S. Park, V. Crede +145
First measurements of double-polarization observables in photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Accept…
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…
Measurement of Beam-Recoil Observables and for Photoproduction
CLAS Collaboration, S. Adhikari, B. A. Raue +154
Exclusive photoproduction of final states off a proton target has been an important component in the search for missing nucleon resonances and our understanding of the pro…
A multidimensional study of the structure function ratio from hard exclusive electro-production off protons in the GPD regime
S. Diehl, A. Kim, K. Joo +151
A multidimensional extraction of the structure function ratio from the hard exclusive reaction above the resonance region has been…
Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
A. Accardi, P. Achenbach, D. Adhikari +441
This document presents the initial scientific case for upgrading the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (JLab) to 22 GeV. It is the result of a…
Observation of Beam Spin Asymmetries in the Process with CLAS12
T. B. Hayward, C. Dilks, A. Vossen +140
The observation of beam spin asymmetries in two-pion production in semi-inclusive deep inelastic scattering off an unpolarized proton target is reported. The data presented here we…
Differential Cross Section for using CLAS at Jefferson Lab
T. Chetry, K. Hicks, N. Compton +1
The cross section for coherent -meson photoproduction off the deuteron has been measured for the first time as a function of the momentum transfer and photo…
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…
Deep exclusive electroproduction of at high in the quark valence regime
The Jefferson Lab Hall A Collaboration, M. Dlamini, B. Karki +159
We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of (0.36, 0.48 and 0.60) and (3.1 to 8.4 GeV) obtai…
Alignment of the CLAS12 central hybrid tracker with a Kalman Filter
S. J. Paul, A. Peck, M. Arratia +131
Several factors can contribute to the difficulty of aligning the sensors of tracking detectors, including a large number of modules, multiple types of detector technologies, and no…