papers

Publications (52)

nucl-ex2020

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,…

nucl-ex2017

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…

nucl-ex2016

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 $γ^* p \to p π^0$, expanding an analysis…

hep-ex2022

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…

hep-ph2022

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…

hep-ex2022

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…

hep-ex2021

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…

nucl-ex2022

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…

nucl-ex2022

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…

hep-ex2021

Differential cross sections for Λ(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…

nucl-ex2019

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…

nucl-ex2017

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…

nucl-ex2022

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…

nucl-ex2017

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…

nucl-ex2023

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…

nucl-ex2023

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 $…

nucl-ex2018

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…

nucl-ex2022

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…

physics.ins-det2021

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…

nucl-ex2021

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…

nucl-ex2019

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,…

nucl-ex2016

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…

hep-ex2022

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…

hep-ex2020

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…

nucl-ex2022

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…

nucl-ex2018

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…

hep-ex2021

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…

nucl-ex2020

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…

nucl-ex2018

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…

nucl-ex2021

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…

nucl-ex2018

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…

nucl-ex2017

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…

nucl-ex2019

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…

nucl-ex2020

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…

nucl-ex2017

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…

nucl-ex2023

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…

nucl-ex2017

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…

nucl-ex2017

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…

nucl-ex2023

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…

nucl-ex2022

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…

nucl-ex2016

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…

nucl-ex2017

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…

nucl-ex2019

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…

nucl-ex2018

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…

nucl-ex2025

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…

hep-ex2023

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…

nucl-ex2023

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…

hep-ex2021

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…

nucl-ex2018

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…

nucl-ex2021

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…

hep-ex2021

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…

physics.ins-det2022

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…