A. El Alaoui

activity

20092026

most citedMomentum sharing in imbalanced Fermi systems

310 citations · 3.4k across the 75 of their papers we have counts for

collaborators

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48 papers · 1 filter

nucl-ex2026

Measurements of $γ_{v} p \to π^{+} π^{-} p^{'}$ Cross Sections with the CLAS12 Detector for $Q^{2}$ from 2.4-8.0 GeV $^{2}$ and $W$ from 1.4-2.1 GeV

K. Neupane, R. W. Gothe, D. S. Carman +145

This paper reports exclusive cross sections for the $e p \to e^{'} π^{+} π^{-} p^{'}$ reaction using the CLAS12 detector at Jefferson Laboratory. The extractions of fully integrated and nine sin…

nucl-ex2026

First Measurement of Near-Threshold J/ψ Photoproduction on the Neutron

R. Tyson, D. G. Ireland, B. McKinnon +139

We report the first measurement of the total and t-differential cross sections for near-threshold J/ $ψ$ photoproduction on the neutron, obtained with the CLAS12 detector at the Tho…

nucl-ex2023

Double-pion electroproduction off protons in deuterium: Quasifree cross sections and final-state interactions

Iu. A. Skorodumina, G. V. Fedotov, R. W. Gothe +1

The single-differential and fully integrated cross sections for quasifree $π^{+} π^{-}$ electroproduction off protons bound in deuterium have been extracted for the first time. The…

nucl-ex2023

Beam Spin Asymmetry Measurements of Deeply Virtual $π^{0}$ 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 $π^{0}$ production in a wide kinematic region with the photon virtualities $Q…

nucl-ex2021

Beam-spin asymmetry $Σ$ for $Σ^{-}$ hyperon photoproduction off the neutron

Nicholas Zachariou, Edwin Munevar, Barry Berman +8

We report a new measurement of the beam-spin asymmetry $Σ$ for the $γ n \to K^{+} Σ^{-}$ reaction using quasi-free neutrons in a liquid-deuterium target. The new…

nucl-ex2020★ 22 cited

Extraction of beam-spin asymmetries from the hard exclusive $π^{+}$ 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 $sin ϕ$ moment $A_{LU}^{s i n ϕ}$ from the hard exclusive $e p \to e^{'} n π^{+}$ reaction above the resonance region, fo…

nucl-ex2020★ 102 cited

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-ex2020★ 11 cited

First measurement of direct photoproduction of the $a_{2} (1320)^{0}$ meson on the proton

A. Celentano, M. Battaglieri, R. De Vita +4

We present the first measurement of the exclusive reaction $γ p \to a_{2} (1320)^{0} p$ in the photon energy range $3.5$ - $5.5$ GeV and four-momentum transfer squared $0.2<-t<2…

nucl-ex2018

First Measurements of the Double-Polarization Observables $F$ , $P$ , and $H$ in $ω$ Photoproduction off Transversely Polarized Protons in the $N^{*}$ Resonance Region

P. Roy, S. Park, V. Crede +145

First measurements of double-polarization observables in $ω$ photoproduction off the proton are presented using transverse target polarization and data from the CEBAF Large Accepta…

nucl-ex2018★ 23 cited

Measurement of Nuclear Transparency Ratios for Protons and Neutrons

M. Duer, O. Hen, E. Piasetzky +6

This paper presents, for the first time, measurements of neutron transparency ratios for nuclei relative to C measured using the (e,e'n) reaction, spanning measured neutron momenta…

nucl-ex2018★ 117 cited

Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei

M. Duer, A. Schmidt, J. R. Pybus +11

We measured the triple coincidence A(e,e'np) and A(e,e'pp) reactions on carbon, aluminum, iron, and lead targets at Q2 > 1.5 (GeV/c)2, xB > 1.1 and missing momentum > 400 MeV/c. Th…

nucl-ex2018★ 58 cited

The center of mass motion of short-range correlated nucleon pairs studied via the A(e,e'pp) reaction

E. O. Cohen, O. Hen, E. Piasetzky +6

Short-Range Correlated (SRC) nucleon pairs are a vital part of the nucleus, accounting for almost all nucleons with momentum greater than the Fermi momentum (kF). A fundamental cha…

nucl-ex2018★ 4 cited

First Measurement of $Ξ^{-}$ Polarization in Photoproduction

J. Bono, L. Guo., B. Raue

Despite decades of studies of the photoproduction of hyperons, both their production mechanisms and their spectra of excited states are still largely unknown. While the parity-viol…

nucl-ex2017★ 30 cited

Hard exclusive pion electroproduction at backward angles with CLAS

K. Park, M. Guidal, R. W. Gothe +3

We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off the proton, $e p \to e^{'} n π^{+}$ , above the resonance region at bac…

nucl-ex2017★ 32 cited

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 $g_{1}$ spin structure function of the deuteron at low $Q^{2}$ , where QCD can be approximated with chiral perturbation theory ( $χ$ PT). The data cover the resonance re…

nucl-ex2017★ 43 cited

First Exclusive Measurement of Deeply Virtual Compton Scattering off $^{4}$ 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-ex2017

The Beam-Target Helicity Asymmetry for $γ n \to π^{-} p$ in the {\bf{ $N^{*}$ } Resonance Region

D. Ho, P. Peng, C. Bass +140

We report the first beam-target double-polarization asymmetries in the $γ + n (p) \to π^{-} + p (p)$ reaction spanning the nucleon resonance region from invariant mass $W$ = $150…

nucl-ex2016★ 6 cited

Beam-target double spin asymmetry in quasi-elastic electron scattering off the deuteron with CLAS

Michael Mayer, Sebastian E. Kuhn, the CLAS Collaboration

Quasi-elastic electron scattering on the deuteron is a benchmark reaction to test our understanding of deuteron structure and the properties and interactions of the two nucleons bo…

nucl-ex2015★ 5 cited

Determination of the Beam-Spin Asymmetry of Deuteron Photodisintegration in the Energy Region $E_{γ} = 1.1 - 2.3$ GeV

Nicholas Zachariou, Yordanka Ilieva, Nikolay Ya. Ivanov +140

The beam-spin asymmetry, $Σ$ , for the reaction $γ d \to p n$ has been measured using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerato…

nucl-ex2015★ 36 cited

First Measurement of the Polarization Observable E in the $p (γ, π^{+}) n$ Reaction up to 2.25 GeV

S. Strauch, W. J. Briscoe, M. Döring +165

First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction $γ p \to π^{+} n$ , has…

nucl-ex2014★ 52 cited

Measurements of $e p \to e^{'} π^{+} n$ at W = 1.6 - 2.0 GeV and extraction of nucleon resonance electrocouplings at CLAS

K. Park, I. G. Aznauryan, V. D. Burkert +1

Differential cross sections of the exclusive process $e p \to e^{'} π^{+} n$ were measured with good precision in the range of the photon virtuality $Q^{2} = 1.8 - 4.5$ GeV $^{2}$ , and…

nucl-ex2014★ 13 cited

Strangeness Suppression in q-qbar Creation Observed in Exclusive Reactions

K. Park, M. D. Mestayer, the CLAS collaboration

We measured the ratios of electroproduction cross-sections from a proton target for three exclusive meson-baryon final states: $Λ K^{+}$ , $p π^{0}$ , and $n π^{+}$ , with the CLAS detector at…

nucl-ex2014★ 310 cited

Momentum sharing in imbalanced Fermi systems

O. Hen, M. Sargsian, L. B. Weinstein +138

The atomic nucleus is composed of two different kinds of fermions, protons and neutrons. If the protons and neutrons did not interact, the Pauli exclusion principle would force the…

nucl-ex2014★ 102 cited

Towards a resolution of the proton form factor problem: new electron and positron scattering data

D. Adikaram, D. Rimal, L. B. Weinstein +133

There is a significant discrepancy between the values of the proton electric form factor, $G_{E}^{p}$ , extracted using unpolarized and polarized electron scattering. Calculations predi…

Measurements of γv​p→π+π−p′ Cross Sections with the CLAS12 Detector for Q2 from 2.4-8.0 GeV2 and W from 1.4-2.1 GeV

First Measurement of Near-Threshold J/ψ Photoproduction on the Neutron

Double-pion electroproduction off protons in deuterium: Quasifree cross sections and final-state interactions

Beam Spin Asymmetry Measurements of Deeply Virtual π0 Production with CLAS12

Beam-spin asymmetry Σ for Σ− hyperon photoproduction off the neutron

Extraction of beam-spin asymmetries from the hard exclusive π+ channel off protons in a wide range of kinematics