Publications (82)
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…
Proton electron elastic scattering and the proton charge radius
G. I. Gakh, A. Dbeyssi, E. Tomasi-Gustafsson +2
It is suggested that proton elastic scattering on atomic electrons allows a precise measurement of the proton charge radius. Very small values of transferred momenta (up to four or…
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…
Precise Beam Energy Determination for Hall A after the CEBAF 12 GeV Upgrade
S. N. Santiesteban, L. Tracy, D. Flay +4
Precise and accurate measurements of the beam energy delivered to the experimental halls at the Thomas Jefferson Accelerator Facility (Jefferson Lab) is required by many experiment…
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…
Signal formation and sharing in AC-LGADs using the ALTIROC 0 front-end chip
G. D'Amen, W. Chen, C. De La Taille +9
The development of detectors that provide high resolution in four dimensions has attracted wide-spread interest in the scientific community for applications in high-energy physics,…
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 $…
Polarized Structure Function from Electroproduction Data in the Resonance Region at GeV GeV
E. L. Isupov, V. D. Burkert, A. A. Golubenko +138
The first results on the structure function in exclusive electroproduction at invariant masses of the final state of 1.5 GeV 1.8 GeV and in the range…
Scientific Computing Plan for the ECCE Detector at the Electron Ion Collider
J. C. Bernauer, C. T. Dean, C. Fanelli +271
The Electron Ion Collider (EIC) is the next generation of precision QCD facility to be built at Brookhaven National Laboratory in conjunction with Thomas Jefferson National Laborat…
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…
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…
Multidimensional Measurements of Beam Single Spin Asymmetries in Semi-inclusive Deep-inelastic Charged Kaon Electroproduction off Protons in the Valence Region
A. Kripko, S. Diehl, K. Joo +136
Measurements of beam single spin asymmetries in semi-inclusive deep inelastic electron scattering (SIDIS) with positively charged kaons off protons have been performed with 10.6 an…
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…
Merits and constraints of low- experimental data for the proton radius determination
M. Hoballah, S. Cholak, R. Kunne +5
The question of the determination of the proton charge radius from electron scattering data led to an unprecedented experimental effort for measurements of the electric form…
Design of the ECCE Detector for the Electron Ion Collider
J. K. Adkins, Y. Akiba, A. Albataineh +274
The EIC Comprehensive Chromodynamics Experiment (ECCE) detector has been designed to address the full scope of the proposed Electron Ion Collider (EIC) physics program as presented…
Open Heavy Flavor Studies for the ECCE Detector at the Electron Ion Collider
X. Li, J. K. Adkins, Y. Akiba +276
The ECCE detector has been recommended as the selected reference detector for the future Electron-Ion Collider (EIC). A series of simulation studies have been carried out to valida…
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…
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 the nucleon spin structure functions for 0.01<<1 GeV using CLAS
A. Deur, S. E. Kuhn, M. Ripani +147
The spin structure functions of the proton and the deuteron were measured during the EG4 experiment at Jefferson Lab in 2006. Data were collected for longitudinally polarized elect…
Experimental access to Transition Distribution Amplitudes with the PANDA experiment at FAIR
PANDA Collaboration, B. P. Singh, W. Erni +532
Baryon-to-meson Transition Distribution Amplitudes (TDAs) encoding valuable new information on hadron structure appear as building blocks in the collinear factorized description fo…
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 Study of the Nuclear Response to Fast Hadrons via Angular Correlations between Pions and Slow Protons in Electron-Nucleus Scattering
S. J. Paul, M. Arratia, H. Hakobyan +127
We report on the first measurement of angular correlations between high-energy pions and slow protons in electron-nucleus () scattering, providing a new probe of how a nucleus…
Double deeply virtual Compton scattering with positron beams at SoLID
S. Zhao, A. Camsonne, D. Marchand +5
Double Deeply Virtual Compton Scattering (DDVCS) is the only experimental channel for the determination of the dependence of the Generalized Parton Distributions (GPDs) on both the…
2025 EIC-France Workshop: Physics Highlights and Perspectives
F. Arleo, V. Bertone, J. Bettane +75
This document presents a synthesis of the theory contributions and discussions from the 2nd EIC-France Workshop, held at IJCLab (Orsay) on 1-3 December 2025. The workshop brought t…
Determination of the moments of the proton charge density
M. Atoui, M. B. Barbaro, M. Hoballah +5
A global analysis of proton electric form factor experimental data from Rosenbluth separation and low squared four-momentum transfer experiments is discussed for the evaluation of…
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…
First Measurement of Deeply Virtual Compton Scattering on the Neutron with Detection of the Active Neutron
CLAS Collaboration, A. Hobart, S. Niccolai +146
Measuring Deeply Virtual Compton Scattering on the neutron is one of the necessary steps to understand the structure of the nucleon in terms of Generalized Parton Distributions (GP…
Feasibility studies of the time-like proton electromagnetic form factor measurements with PANDA at FAIR
M. Sudol, M. C. Mora Espi, E. Becheva +14
The possibility of measuring the proton electromagnetic form factors in the time-like region at FAIR with the \PANDA detector is discussed. Detailed simulations on signal efficienc…
Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR
PANDA Collaboration, B. Singh, W. Erni +502
Simulation results for future measurements of electromagnetic proton form factors at \PANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision w…
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…
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…
Feasibility study for the measurement of TDAs at PANDA in
PANDA Collaboration, B. Singh, W. Erni +508
The exclusive charmonium production process in annihilation with an associated meson is studied in the framework of QCD collinear factoriza…
Connecting spatial moments and momentum densities
M. Hoballah, M. B. Barbaro, R. Kunne. +5
The precision of experimental data and analysis techniques is a key feature of any discovery attempt. A striking example is the proton radius puzzle where the accuracy of the spect…
Production and Integration of the ATLAS Insertable B-Layer
B. Abbott, J. Albert, F. Alberti +373
During the shutdown of the CERN Large Hadron Collider in 2013-2014, an additional pixel layer was installed between the existing Pixel detector of the ATLAS experiment and a new, s…
Technical Design Report for the: PANDA Micro Vertex Detector
PANDA Collaboration, W. Erni, I. Keshelashvili +454
This document illustrates the technical layout and the expected performance of the Micro Vertex Detector (MVD) of the PANDA experiment. The MVD will detect charged particles as clo…
Measurement of Strange Quark Contributions to the Nucleon's Form Factors at Q^2=0.230 (GeV/c)^2
A4 Collaboration, F. E. Maas, P. Achenbach +31
We report on a measurement of the parity-violating asymmetry in the scattering of longitudinally polarized electrons on unpolarized protons at a of 0.230 (GeV/c)^2 and a scat…
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…
Physics with Positron Beams at Jefferson Lab 12 GeV
A. Afanasev, I. Albayrak, S. Ali +124
Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental program at the next generation of lepton accelerators. In the context o…
Search for Charged Lepton Flavor Violation at the EIC with the ECCE Detector
J. -L. Zhang, S. Mantry, J. K. Adkins +276
The recently approved Electron-Ion Collider (EIC) will provide a unique new opportunity for searches of charged lepton flavor violation (CLFV) and other new physics scenarios. In c…
Technical Design Report for the: PANDA Straw Tube Tracker
PANDA Collaboration, W. Erni, I. Keshelashvili +470
This document describes the technical layout and the expected performance of the Straw Tube Tracker (STT), the main tracking detector of the PANDA target spectrometer. The STT encl…
Recoil Polarization in Electroproduction in the Nucleon Resonance Region with CLAS12
D. S. Carman, A. D'Angelo, L. Lanza +127
Hyperon recoil polarization measurements for the exclusive electroproduction of and final states from an unpolarized proton target have been carried out using the…
ATHENA Detector Proposal -- A Totally Hermetic Electron Nucleus Apparatus proposed for IP6 at the Electron-Ion Collider
ATHENA Collaboration, J. Adam, L. Adamczyk +433
ATHENA has been designed as a general purpose detector capable of delivering the full scientific scope of the Electron-Ion Collider. Careful technology choices provide fine trackin…
Monte Carlo simulation of virtual Compton scattering below pion threshold
P. Janssens, L. Van Hoorebeke, H. Fonvieille +22
This paper describes the Monte Carlo simulation developed specifically for the VCS experiments below pion threshold that have been performed at MAMI and JLab. This simulation gener…
Inclusive Electron Scattering in the Resonance Region off a Hydrogen Target with CLAS12
V. Klimenko, D. S. Carman, R. W. Gothe +135
Inclusive electron scattering cross sections off a hydrogen target at a beam energy of 10.6 GeV have been measured with data collected from the CLAS12 spectrometer at Jefferson Lab…
Determination of the moments of the proton charge density: is there a proton radius puzzle?
M. Atoui, M. B. Barbaro, M. Hoballah +6
The charge radius of the proton can be determined using two different kinds of experiments: the spectroscopy technique, measuring the hyperfine structure of hydrogen atoms, and the…
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…
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…
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 neutron and proton analyzing powers on , , and targets in the momentum region 3-4.2 GeV/c
S. N. Basilev, Yu. P. Bushuev, O. P. Gavrishchuk +28
The analyzing powers for proton elastic scattering () and neutron charge exchange () reactions on nuclei have been measured on , , a…
First measurement of hard exclusive electroproduction beam-spin asymmetries off the proton
S. Diehl, N. Trotta, K. Joo +142
The polarized cross section ratio from hard exclusive electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin…
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…
ECCE Sensitivity Studies for Single Hadron Transverse Single Spin Asymmetry Measurements
R. Seidl, A. Vladimirov, D. Pitonyak +275
We performed feasibility studies for various single transverse spin measurements that are related to the Sivers effect, transversity and the tensor charge, and the Collins fragment…
AI-assisted Optimization of the ECCE Tracking System at the Electron Ion Collider
C. Fanelli, Z. Papandreou, K. Suresh +272
The Electron-Ion Collider (EIC) is a cutting-edge accelerator facility that will study the nature of the "glue" that binds the building blocks of the visible matter in the universe…
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…
ECCE unpolarized TMD measurements
R. Seidl, A. Vladimirov, J. K. Adkins +273
We performed feasibility studies for various measurements that are related to unpolarized TMD distribution and fragmentation functions. The processes studied include semi-inclusive…
Model independent analysis of polarization effects in elastic proton-electron scattering
G. I. Gakh, A. Dbeyssi, D. Marchand +2
The experimental observables for the elastic reaction induced by protons on electrons are calculated in the Born approximation. Model independent expressions are derived for the di…
The G0 Experiment: Apparatus for Parity-Violating Electron Scattering Measurements at Forward and Backward Angles
G0 Collaboration, D. Androic, D. S. Armstrong +127
In the G0 experiment, performed at Jefferson Lab, the parity-violating elastic scattering of electrons from protons and quasi-elastic scattering from deuterons is measured in order…
Detector Requirements and Simulation Results for the EIC Exclusive, Diffractive and Tagging Physics Program using the ECCE Detector Concept
A. Bylinkin, C. T. Dean, S. Fegan +272
This article presents a collection of simulation studies using the ECCE detector concept in the context of the EIC's exclusive, diffractive, and tagging physics program, which aims…
Exclusive J/ Detection and Physics with ECCE
X. Li, J. K. Adkins, Y. Akiba +276
Exclusive heavy quarkonium photoproduction is one of the most popular processes in EIC, which has a large cross section and a simple final state. Due to the gluonic nature of the e…
Giant proximity effect in a phase-fluctuating superconductor
D. Marchand, L. Covaci, M. Berciu +1
When a tunneling barrier between two superconductors is formed by a normal material that would be a superconductor in the absence of phase fluctuations, the resulting Josephson eff…
A Direct Measurement of Hard Two-Photon Exchange with Electrons and Positrons at CLAS12
A. Schmidt, W. J. Briscoe, O. Cortes +29
One of the most surprising discoveries made at Jefferson Lab has been the discrepancy in the determinations of the proton's form factor ratio between unpolarized…
Measurements of Cross Sections with the CLAS Detector for from 2.0--5.0~GeV and from 1.400--2.125~GeV
A. Trivedi, R. W. Gothe, E. Phelps +122
Observables in the electroproduction of the reaction channel off the proton that are sensitive to the polarization of the virtual photon are presented for the first tim…
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…
QED radiative corrections to virtual Compton scattering
M. Vanderhaeghen, J. M. Friedrich, D. Lhuillier +3
The QED radiative corrections to virtual Compton scattering (reaction ) are calculated to first order in . A detailed study is presented…
Design and Simulated Performance of Calorimetry Systems for the ECCE Detector at the Electron Ion Collider
F. Bock, N. Schmidt, P. K. Wang +276
We describe the design and performance the calorimeter systems used in the ECCE detector design to achieve the overall performance specifications cost-effectively with careful cons…
Measurement of the near-threshold J photoproduction cross section with the CLAS12 experiment
P. Chatagnon, V. Kubarovsky, R. Paremuzyan +147
We present measurements of the total and differential cross sections for near-threshold J/ photoproduction obtained with the CLAS12 detector at the Thomas Jefferson National Ac…
CORE -- a COmpact detectoR for the EIC
CORE Collaboration, R. Alarcon, M. Baker +56
The COmpact detectoR for the Eic (CORE) Proposal was submitted to the EIC "Call for Collaboration Proposals for Detectors". CORE comprehensively covers the physics scope of the EIC…
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…
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…
Measurements of Beam Spin Asymmetries of dihadrons at CLAS12
A. G. Acar, P. Achenbach, J. S. Alvarado +131
A first measurement of beam spin asymmetries for and pairs in semi-inclusive deep inelastic scattering is reported. The asymmetries in the dihadron angular di…
Technical Design Report for the PANDA Endcap Disc DIRC
Panda Collaboration, F. Davi, W. Erni +460
PANDA (anti-Proton ANnihiliation at DArmstadt) is planned to be one of the four main experiments at the future international accelerator complex FAIR (Facility for Antiproton and I…
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…
Virtual Compton Scattering and the Generalized Polarizabilities of the Proton at Q^2=0.92 and 1.76 GeV^2
H. Fonvieille, G. Laveissiere, N. Degrande +161
Virtual Compton Scattering (VCS) on the proton has been studied at Jefferson Lab using the exclusive photon electroproduction reaction (e p --> e p gamma). This paper gives a detai…
Proton Transparency and Neutrino Physics: New Methods and Modeling
S. Dytman, M. Betancourt, N. Steinberg +139
Extracting accurate results from neutrino oscillation and cross section experiments requires accurate simulation of the neutrino-nucleus interaction. The rescattering of outgoing h…
Measurement of single- and double-polarization observables in the photoproduction of ~meson pairs off the proton using CLAS at Jefferson Laboratory
P. Roy, S. Cao, V. Crede +141
The photoproduction of meson pairs off the proton has been studied in the reaction using the CEBAF Large Acceptance Spectrometer (CLAS) and the froz…
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,…
G Electronics and Data Acquisition (Forward-Angle Measurements)
D. Marchand, J. Arvieux, L. Bimbot +26
The G parity-violation experiment at Jefferson Lab (Newport News, VA) is designed to determine the contribution of strange/anti-strange quark pairs to the intrinsic properties…