F. X. Girod
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View article: <i>Colloquium</i>: Gravitational form factors of the proton
<i>Colloquium</i>: Gravitational form factors of the proton Open
The physics of the gravitational form factors of the proton, and their understanding within quantum chromodynamics, has advanced significantly in the past two decades through both theory and experiment. Furthermore, this Colloquium provide…
View article: The mechanical radius of the proton
The mechanical radius of the proton Open
We present the first determination of the proton mechanical radius. The result was obtained by employing a novel theoretical approach that connects experimental data of deeply virtual Compton scattering with the spin = 2 interaction that i…
View article: Observation of large missing-momentum <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>(</mml:mo><mml:mi>e</mml:mi><mml:mo>,</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mi>p</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> cross-section scaling and the onset of correlated-pair dominance in nuclei
Observation of large missing-momentum cross-section scaling and the onset of correlated-pair dominance in nuclei Open
We report the measurement of 𝒙B scaling in (e,e′p) cross-section ratios off nuclei relative to deuterium at large missing momentum of 350 ≤ Pmiss ≤ 600 MeV/c. The observed scaling extends over a kinematic range of 0.7 ≤ 𝒙B ≤ 1.8, which is …
View article: Precision studies of QCD in the low energy domain of the EIC
Precision studies of QCD in the low energy domain of the EIC Open
View article: 12C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region
12C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region Open
View article: Determination of shear forces inside the proton
Determination of shear forces inside the proton Open
We report on the first determination of the shear forces quarks inside the proton from experimental data on deeply virtual Compton scattering. The maximum shear force of approximately 40 MeV/fm occurs near 0.6 fm from the proton center, in…
View article: Photoproduction of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>η</mml:mi></mml:math> mesons off the proton for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1.2</mml:mn><mml:mo><</mml:mo><mml:msub><mml:mi>E</mml:mi><mml:mi>γ</mml:mi></mml:msub><mml:mo><</mml:mo><mml:mn>4.7</mml:mn><mml:mspace width="0.16em"/><mml:mi>GeV</mml:mi></mml:mrow></mml:math> using CLAS at Jefferson Laboratory
Photoproduction of mesons off the proton for using CLAS at Jefferson Laboratory Open
Photoproduction cross sections are reported for the reaction $\\gamma p\\to\np\\eta$ using energy-tagged photons and the CLAS spectrometer at Jefferson\nLaboratory. The $\\eta$ mesons are detected in their dominant charged decay\nmode, $\\…
View article: Precision measurements of A=3 nuclei in Hall B
Precision measurements of A=3 nuclei in Hall B Open
We propose a high-statistics measurement of few body nuclear structure and short range correlations in quasi-elastic scattering at 6.6 GeV from $^2$H, $^3$He and $^3$H targets in Hall B with the CLAS12 detector. We will measure absolute cr…
View article: $^{12}$C(e,e'pN) Measurements of Short Range Correlations in the\n Tensor-to-Scalar Interaction Transition Region
$^{12}$C(e,e'pN) Measurements of Short Range Correlations in the\n Tensor-to-Scalar Interaction Transition Region Open
High-momentum configurations of nucleon pairs at short-distance are probed\nusing measurements of the $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pN)$ reactions\n(where $N$ is either $n$ or $p$), at high-$Q^2$ and $x_B>1.1$. The data span a\nmissi…
View article: The CLAS12 Spectrometer at Jefferson Laboratory
The CLAS12 Spectrometer at Jefferson Laboratory Open
View article: Measurement of nuclear transparency ratios for protons and neutrons
Measurement of nuclear transparency ratios for protons and neutrons Open
View article: Physics with Positron Beams at Jefferson Lab 12 GeV
Physics with Positron Beams at Jefferson Lab 12 GeV Open
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 of the Hadronic Physics program at the Jefferson Laboratory …
View article: Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei
Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei Open
We measured the triple coincidence A(e,e^{'}np) and A(e,e^{'}pp) reactions on carbon, aluminum, iron, and lead targets at Q^{2}>1.5 (GeV/c)^{2}, x_{B}>1.1 and missing momentum >400 MeV/c. This was the first direct measurement of both proto…
View article: Measurement of unpolarized semi-inclusive pi+ electroproduction off the proton
Measurement of unpolarized semi-inclusive pi+ electroproduction off the proton Open
Semi-inclusive pi+ electroproduction on protons has been measured with the CLAS detector at Jefferson Lab. The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam. The complete five-fold differential cross …
View article: Probing high-momentum protons and neutrons in neutron-rich nuclei
Probing high-momentum protons and neutrons in neutron-rich nuclei Open
View article: The pressure distribution inside the proton
The pressure distribution inside the proton Open
View article: Hard exclusive pion electroproduction at backward angles with CLAS
Hard exclusive pion electroproduction at backward angles with CLAS Open
View article: Deeply virtual Compton scattering with a positron beam
Deeply virtual Compton scattering with a positron beam Open
The hard electroproduction of a photon off a hadron in the Bjorken regime, Deeply Virtual Compton Scattering, unravels three-dimensional information on the partonic structure of the hadron. The imaginary part of the amplitude is more parti…
View article: First Exclusive Measurement of Deeply Virtual Compton Scattering off <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>He</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>: Toward the 3D Tomography of Nuclei
First Exclusive Measurement of Deeply Virtual Compton Scattering off : Toward the 3D Tomography of Nuclei Open
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 uses the 6 GeV electron beam from the Continuous Electron Beam Accelerator F…
View article: Partonic Structure of Light Nuclei
Partonic Structure of Light Nuclei Open
We propose to study the partonic structure of $^4$He by measuring the Beam Spin Asymmetry (BSA) in coherent Deeply Virtual Compton Scattering (DVCS) and the differential cross-section of the Deeply Virtual Meson Production (DVMP) of the $ϕ…
View article: Nuclear Exclusive and Semi-inclusive Measurements with a New CLAS12 Low Energy Recoil Tracker
Nuclear Exclusive and Semi-inclusive Measurements with a New CLAS12 Low Energy Recoil Tracker Open
We propose to study the partonic structure of $^4$He by measuring the Beam Spin Asymmetry (BSA) in coherent Deeply Virtual Compton Scattering (DVCS) and the differential cross-section of the Deeply Virtual Meson Production (DVMP) of the $\…
View article: Spectator-Tagged Deeply Virtual Compton Scattering on Light Nuclei
Spectator-Tagged Deeply Virtual Compton Scattering on Light Nuclei Open
The three-dimensional picture of quarks and gluons in the proton is set to be revealed through Deeply virtual Compton scattering while a critically important puzzle in the one-dimensional picture remains, namely, the origins of the EMC eff…
View article: Tagged EMC Measurements on Light Nuclei
Tagged EMC Measurements on Light Nuclei Open
We propose to measure tagged deep inelastic scattering from light nuclei (deuterium and $^4$He) by detecting the low energy nuclear spectator recoil (p, $^3$H and $^3$He) in addition to the scattered electron. The proposed experiment will …
View article: The Heavy Photon Search beamline and its performance
The Heavy Photon Search beamline and its performance Open
View article: Exclusive <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>η</mml:mi></mml:math> electroproduction at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>W</mml:mi><mml:mo>></mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math> GeV with CLAS and transversity generalized parton distributions
Exclusive electroproduction at GeV with CLAS and transversity generalized parton distributions Open
© 2017 American Physical Society. The cross section of the exclusive η electroproduction reaction ep→e′p′η was measured at Jefferson Laboratory with a 5.75 GeV electron beam and the CLAS detector. Differential cross sections d4σ/dtdQ2dxBdφ…
View article: Beam-target double-spin asymmetry in quasielastic electron scattering off the deuteron with CLAS
Beam-target double-spin asymmetry in quasielastic electron scattering off the deuteron with CLAS Open
The deuteron plays a pivotal role in nuclear and hadronic physics, as both the simplest bound multinucleon system and as an effective neutron target. Quasielastic electron scattering on the deuteron is a benchmark reaction to test our unde…
View article: Target and double spin asymmetries of deeply virtual π0 production with a longitudinally polarized proton target and CLAS
Target and double spin asymmetries of deeply virtual π0 production with a longitudinally polarized proton target and CLAS Open
View article: The HPS electromagnetic calorimeter
The HPS electromagnetic calorimeter Open
View article: Target and beam-target spin asymmetries in exclusive <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> electroproduction with 1.6- to 5.7-GeV electrons
Target and beam-target spin asymmetries in exclusive and electroproduction with 1.6- to 5.7-GeV electrons Open
© 2016 American Physical Society. Beam-target double-spin asymmetries and target single-spin asymmetries in exclusive π+ and quasiexclusive π- electroproduction were obtained from scattering of 1.6- to 5.7-GeV longitudinally polarized elec…
View article: Measurement of target and double-spin asymmetries for the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>e</mml:mi><mml:mo></mml:mo></mml:mover><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo></mml:mo></mml:mover><mml:mo>→</mml:mo><mml:mi>e</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> reaction in the nucleon resonance region at low <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>
Measurement of target and double-spin asymmetries for the reaction in the nucleon resonance region at low Open
© 2016 American Physical Society. We report measurements of target- and double-spin asymmetries for the exclusive channel e - p - →eπ+(n) in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS)…