P. Eugenio
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View article: Measurement of the total compton scattering cross section between 6.5 and 11 GeV
Measurement of the total compton scattering cross section between 6.5 and 11 GeV Open
The total cross section for Compton scattering off atomic electrons, γ+e→γ′+e′, was measured using photons with energies between 6.5 and 11.1 GeV incident on a 9Be target as part of the PrimEx-eta experiment in Hall D at Jefferson Lab. Thi…
View article: Polarization Observables $T$ and $F$ in the $γp \to π^0 p$ Reaction at CLAS
Polarization Observables $T$ and $F$ in the $γp \to π^0 p$ Reaction at CLAS Open
Pion photoproduction in the $\overrightarrowγ\overrightarrow p \to π^0 p$ reaction has been measured in the FROST experiment at the Thomas Jefferson National Accelerator Facility. In this experiment, circularly polarized photons with energ…
View article: Measurement of Beam-Recoil Observables $C_x$ and $C_z$ for $K^+Λ$ Photoproduction
Measurement of Beam-Recoil Observables $C_x$ and $C_z$ for $K^+Λ$ Photoproduction Open
Exclusive photoproduction of $K^+ Λ$ final states off a proton target has been an important component in the search for missing nucleon resonances and our understanding of the production of final states containing strange quarks. Polarizat…
View article: Suppression of neutral-pion production in deep-inelastic scattering off nuclei with the CLAS detector
Suppression of neutral-pion production in deep-inelastic scattering off nuclei with the CLAS detector Open
We present the first threefold differential measurement for neutral-pion multiplicity ratios produced in semi-inclusive deep-inelastic electron scattering on carbon, iron, and lead nuclei normalized to deuterium from CLAS at Jefferson Lab.…
View article: Measurement of single- and double-polarization observables in the photoproduction of $π^+π^-$~meson pairs off the proton using CLAS at Jefferson Laboratory
Measurement of single- and double-polarization observables in the photoproduction of $π^+π^-$~meson pairs off the proton using CLAS at Jefferson Laboratory Open
The photoproduction of $π^+π^-$ meson pairs off the proton has been studied in the reaction $γp\to p\,π^+π^-$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson Nationa…
View article: Photoproduction of two charged pions off protons in the resonance region
Photoproduction of two charged pions off protons in the resonance region Open
Photoproduction of charged pions pairs off protons is studied within the invariant masses of the final state hadrons from 1.6 to 2.4 GeV at the Thomas Jefferson National Accelerator Facility with the CLAS detector. The total and differenti…
View article: Photoproduction of two charged pions off protons in the resonance region
Photoproduction of two charged pions off protons in the resonance region Open
Photoproduction of charged pions pairs off protons is studied within the invariant masses of the final state hadrons from 1.6 to 2.4 GeV at the Thomas Jefferson National Accelerator Facility with the CLAS detector. The data are included in…
View article: Dihadron Azimuthal Correlations in Deep-Inelastic Scattering Off Nuclear Targets
Dihadron Azimuthal Correlations in Deep-Inelastic Scattering Off Nuclear Targets Open
We measured the nuclear dependence of the di-pion azimuthal correlation function in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) and a 5 GeV electron beam. As the nuclear-target size increases, trans…
View article: Suppression of neutral pion production in deep-inelastic scattering off nuclei with the CLAS detector
Suppression of neutral pion production in deep-inelastic scattering off nuclei with the CLAS detector Open
We present the first three-fold differential measurement for neutral pion multiplicity ratios produced in semi-inclusive deep-inelastic electron scattering on carbon, iron and lead nuclei normalized to deuterium from CLAS at Jefferson Lab.…
View article: Measurement of the helicity asymmetry $\mathbb{E}$ for the $\vecγ\vec{p} \to p π^0$ reaction in the resonance region
Measurement of the helicity asymmetry $\mathbb{E}$ for the $\vecγ\vec{p} \to p π^0$ reaction in the resonance region Open
The double-spin-polarization observable $\mathbb{E}$ for $\vecγ\vec{p}\to pπ^0$ has been measured with the CEBAF Large Acceptance Spectrometer (CLAS) at photon beam energies $E_γ$ from 0.367 to $2.173~\mathrm{GeV}$ (corresponding to center…
View article: First Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Λ</mml:mi></mml:math> Electroproduction off Nuclei in the Current and Target Fragmentation Regions
First Measurement of Electroproduction off Nuclei in the Current and Target Fragmentation Regions Open
We report results of Λ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Continuous Electron Beam Accelerator Facility 5.014 GeV electron be…
View article: 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> electroproduction off the neutron in deuterium in the resonance region
Exclusive electroproduction off the neutron in deuterium in the resonance region Open
We report new results for the exclusive and quasi-free cross sections off neutrons bound in deuterium yvn(p) →p π-(p) are presented over a wide final state hadron angle range with a kinematic coverage of the invariant mass (W) up to 1.825 …
View article: Search for photoproduction of axionlike particles at GlueX
Search for photoproduction of axionlike particles at GlueX Open
We present a search for axion-like particles, $a$, produced in photon-proton collisions at a center-of-mass energy of approximately 4 GeV, focusing on the scenario where the $a$-gluon coupling is dominant. The search uses $a\\to\\gamma\\ga…
View article: Measurement of charged-pion production in deep-inelastic scattering off nuclei with the CLAS detector
Measurement of charged-pion production in deep-inelastic scattering off nuclei with the CLAS detector Open
Background: Energetic quarks in nuclear deep-inelastic scattering propagate through the nuclear medium. Processes that are believed to occur inside nuclei include quark energy loss through medium-stimulated gluon bremsstrahlung and intranu…
View article: Polarized Structure Function $\\sigma_{LT'}$ from $\\pi^0 p$\n Electroproduction Data in the Resonance Region at $0.4$ GeV$^2 < Q^2 < 1.0$\n GeV$^2$
Polarized Structure Function $\\sigma_{LT'}$ from $\\pi^0 p$\n Electroproduction Data in the Resonance Region at $0.4$ GeV$^2 < Q^2 < 1.0$\n GeV$^2$ Open
The first results on the $\\sigma_{LT'}$ structure function in exclusive\n$\\pi^0p$ electroproduction at invariant masses of the final state of 1.5 GeV\n$<$ $W$ $<$ 1.8 GeV and in the range of photon virtualities 0.4 GeV$^2 < Q^2 <\n1.0$ G…
View article: Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs
Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs Open
A first measurement of the longitudinal beam spin asymmetry A_{LU} in the semi-inclusive electroproduction of pairs of charged pions is reported. A_{LU} is a higher-twist observable and offers the cleanest access to the nucleon twist-3 par…
View article: Extraction of Beam-Spin Asymmetries from the Hard Exclusive <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math> Channel off Protons in a Wide Range of Kinematics
Extraction of Beam-Spin Asymmetries from the Hard Exclusive Channel off Protons in a Wide Range of Kinematics Open
We have measured beam-spin asymmetries to extract the sinϕ moment A_{LU}^{sinϕ} from the hard exclusive e[over →]p→e^{'}nπ^{+} reaction above the resonance region, for the first time with nearly full coverage from forward to backward angle…
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: First Measurement of Near-Threshold <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi></mml:math> Exclusive Photoproduction off the Proton
First Measurement of Near-Threshold Exclusive Photoproduction off the Proton Open
We report on the measurement of the γp→J/ψp cross section from E_{γ}=11.8 GeV down to the threshold at 8.2 GeV using a tagged photon beam with the GlueX experiment. We find that the total cross section falls toward the threshold less steep…
View article: Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering
Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering Open
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 investigate correlations between the transverse position and the l…
View article: Deeply Virtual Compton Scattering measurement off bound protons
Deeply Virtual Compton Scattering measurement off bound protons Open
We report the first beam spin asymmetry (BSA) measurement of incoherent deeply virtual Compton scattering (DVCS) off $^4$He. The data were accumulated using a 6 GeV longitudinally polarized electron beam incident on a pressurized $^4$He ga…
View article: First results on nucleon resonance photocouplings from the γp → π+π−p reaction
First results on nucleon resonance photocouplings from the γp → π+π−p reaction Open
We report the first experimental measurements of the nine 1-fold differential cross sections for the γp→π + π − p reaction, obtained with the CLAS detector at Jefferson Laboratory. The measurements cover the invariant mass range of the fin…
View article: Measurement of unpolarized and polarized cross sections for deeply virtual Compton scattering on the proton at Jefferson Laboratory with CLAS
Measurement of unpolarized and polarized cross sections for deeply virtual Compton scattering on the proton at Jefferson Laboratory with CLAS Open
This paper reports the measurement of polarized and unpolarized cross sections for the ep→e′p′γ reaction, which is composed of deeply virtual Compton scattering (DVCS) and Bethe-Heitler (BH) processes, at an electron beam energy of 5.88 Ge…