Z. Akbar

activity

20152026

most citedMeasurement of two-photon exchange effect by comparing elastic

e^{\pm} p

cross sections

63 citations · 613 across the 33 of their papers we have counts for

collaborators

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30 papers · 1 filter

nucl-ex2026

First measurement of polarized spin-density matrix elements and differential cross sections d $σ$ /d $t$ in $ω$ ~photoproduction off the proton for $2.7 < E_{γ} < 5.2$ GeV using CLAS at Jefferson Lab

T. Hu, Z. Akbar, V. Crede +147

We report on the differential cross sections d $σ$ /d $t$ , the unpolarized spin-density matrix elements $ρ_{00}^{0}$ , $ρ_{1 - 1}^{0}$ , Re\, $ρ_{10}^{0}$ , and the first extraction of the polari…

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-ex2023

Measurement of the helicity asymmetry $E$ for the $γ p \to p π^{0}$ reaction in the resonance region

K. Chan, N. Zachariou, M. Bashkanov +9

The double-spin-polarization observable $E$ for $γ p \to p π^{0}$ has been measured with the CEBAF Large Acceptance Spectrometer (CLAS) at photon beam energies $E_{γ}$ …

nucl-ex2022

First Measurement of $Λ$ Electroproduction off Nuclei in the Current and Target Fragmentation Regions

T. Chetry, L. El Fassi, W. K. Brooks +151

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 Contin…

nucl-ex2019★ 2 cited

Probing nucleon's spin structures with polarized Drell-Yan in the Fermilab SpinQuest experiment

Andrew Chen, J. C. Peng, H. Leung +51

Although the proton was discovered about 100 years ago, its spin structure still remains a mystery. Recent studies suggest that the orbital angular momentum of sea quarks could sig…

nucl-ex2018★ 35 cited

First results on nucleon resonance photocouplings from the $γ p \to π^{+} π^{-} p$ 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 $γ p \to π^{+} π^{-} p$ reaction, obtained with the CLAS detector at Jefferson Laborat…

nucl-ex2018★ 10 cited

Beam-Target Helicity Asymmetry $E$ in $K^{0} Λ$ and $K^{0} Σ^{0}$ Photoproduction on the Neutron

CLAS Collaboration, D. H. Ho, R. A. Schumacher +146

We report the first measurements of the $E$ beam-target helicity asymmetry for the $γ n \to K^{0} Λ$ , and $K^{0} Σ^{0}$ channels in the energy range 1.70 $\leq W \leq$ 2.34 Ge…

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★ 8 cited

Double $K_{S}^{0}$ Photoproduction off the Proton at CLAS

S. Chandavar, J. T. Goetz, K. Hicks +124

The $f_{0}$ (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-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★ 12 cited

Measurement of the beam asymmetry $Σ$ and the target asymmetry $T$ in the photoproduction of $ω$ mesons off the proton using CLAS at Jefferson Laboratory

P. Roy, Z. Akbar, S. Park +143

The photoproduction of $ω$ mesons off the proton has been studied in the reaction $γ p \to p ω$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROS…

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★ 14 cited

Semi-Inclusive $π_{0}$ 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-ex2017★ 26 cited

Measurement of the helicity asymmetry $E$ in $ω \to π^{+} π^{-} π^{0}$ photoproduction

Z. Akbar, P. Roy, S. Park +131

The double-polarization observable $E$ was studied for the reaction $γ p \to p ω$ using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accel…

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★ 31 cited

Measurement of the Differential and Total Cross Sections of the $γ d \to K^{0} Λ (p)$ Reaction within the Resonance Region

N. Compton, C. E. Taylor, K. Hicks +8

We report the first measurement of differential and total cross sections for the $γ d \to K^{0} Λ (p)$ reaction, using data from the CLAS detector at the Thomas Jefferson National Accel…

nucl-ex2017★ 12 cited

Photon beam asymmetry $Σ$ in the reaction $γ p \to p ω$ for $E_{γ}$ = 1.152 to 1.876 GeV

CLAS Collaboration, P. Collins, B. G. Ritchie +147

Photon beam asymmetry $Σ$ measurements for $ω$ photoproduction in the reaction $γ p \to ω p$ are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a li…

nucl-ex2017★ 26 cited

Differential Cross Section Measurements for $γ n \to π^{-} p$ Above the First Nucleon Resonance Region

P. T. Mattione, D. S. Carman, I. I. Strakovsky +145

The quasi-free $γ d \to π^{-} p (p)$ differential cross section has been measured with CLAS at photon beam energies $E_{γ}$ from 0.445 GeV to 2.510 GeV (corresponding to $W$ from 1.311 Ge…

nucl-ex2017★ 38 cited

Measurements of $e p \to e^{'} π^{+} π^{-} p^{'}$ Cross Sections with CLAS at $1.40 < W < 2.0$ GeV and $2.0 < Q^{2} < 5.0$ GeV $^{2}$

E. L. Isupov, V. D. Burkert, D. S. Carman +5

This paper reports new exclusive cross sections for $e p \to e^{'} π^{+} π^{-} p^{'}$ using the CLAS detector at Jefferson Laboratory. These results are presented for the first time at photo…

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-ex2017★ 43 cited

Photon beam asymmetry $Σ$ for $η$ and $η^{'}$ photoproduction from the proton

P. Collins, B. G. Ritchie, M. Dugger +140

Measurements of the linearly-polarized photon beam asymmetry $Σ$ for photoproduction from the proton of $η$ and $η^{'}$ mesons are reported. A linearly-polarized tagged photon b…

nucl-ex2016★ 9 cited

Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^{2} > 1$ GeV $^{2}$ . II. $e p \to e π^{0} p$

P. E. Bosted, A. Kim, K. P. Adhikari +152

Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive $π^{0}$ electroproduction reaction $γ^{*} p \to p π^{0}$ , expanding an analysis of…

First measurement of polarized spin-density matrix elements and differential cross sections dσ/dt in ω~photoproduction off the proton for 2.7<Eγ​<5.2 GeV using CLAS at Jefferson Lab

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

Measurement of the helicity asymmetry E for the γ​p​→pπ0 reaction in the resonance region

First Measurement of Λ Electroproduction off Nuclei in the Current and Target Fragmentation Regions

Probing nucleon's spin structures with polarized Drell-Yan in the Fermilab SpinQuest experiment

First results on nucleon resonance photocouplings from the γp→π+π−p reaction

Beam-Target Helicity Asymmetry E in K0Λ and K0Σ0 Photoproduction on the Neutron

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

First Measurement of Ξ− Polarization in Photoproduction

Double KS0​ Photoproduction off the Proton at CLAS

Hard exclusive pion electroproduction at backward angles with CLAS

Measurement of the beam asymmetry Σ and the target asymmetry T in the photoproduction of ω mesons off the proton using CLAS at Jefferson Laboratory

Measurement of the Q^2 Dependence of the Deuteron Spin Structure Function g_1 and its Moments at Low Q^2 with CLAS

Semi-Inclusive π0​ target and beam-target asymmetries from 6 GeV electron scattering with CLAS

Measurement of the helicity asymmetry E in ω→π+π−π0 photoproduction

First Exclusive Measurement of Deeply Virtual Compton Scattering off 4He: Toward the 3D Tomography of Nuclei

Measurement of the Differential and Total Cross Sections of the γd→K0Λ(p) Reaction within the Resonance Region

Photon beam asymmetry Σ in the reaction γ​p→pω for Eγ​ = 1.152 to 1.876 GeV

Differential Cross Section Measurements for γn→π−p Above the First Nucleon Resonance Region

Measurements of ep→e′π+π−p′ Cross Sections with CLAS at 1.40<W<2.0 GeV and 2.0<Q2<5.0 GeV2

The Beam-Target Helicity Asymmetry for γ​n→π−p in the {\bf{N∗} Resonance Region

Photon beam asymmetry Σ for η and η′ photoproduction from the proton

Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1 GeV2. II. ep→eπ0p

First measurement of polarized spin-density matrix elements and differential cross sections d $σ$ /d $t$ in $ω$ ~photoproduction off the proton for $2.7 < E_{γ} < 5.2$ GeV using CLAS at Jefferson Lab

Beam Spin Asymmetry Measurements of Deeply Virtual $π^{0}$ Production with CLAS12

Measurement of the helicity asymmetry $E$ for the $γ p \to p π^{0}$ reaction in the resonance region

First Measurement of $Λ$ Electroproduction off Nuclei in the Current and Target Fragmentation Regions

First results on nucleon resonance photocouplings from the $γ p \to π^{+} π^{-} p$ reaction

Beam-Target Helicity Asymmetry $E$ in $K^{0} Λ$ and $K^{0} Σ^{0}$ Photoproduction on the Neutron

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

Double $K_{S}^{0}$ Photoproduction off the Proton at CLAS

Measurement of the beam asymmetry $Σ$ and the target asymmetry $T$ in the photoproduction of $ω$ mesons off the proton using CLAS at Jefferson Laboratory

Semi-Inclusive $π_{0}$ target and beam-target asymmetries from 6 GeV electron scattering with CLAS

Measurement of the helicity asymmetry $E$ in $ω \to π^{+} π^{-} π^{0}$ photoproduction

First Exclusive Measurement of Deeply Virtual Compton Scattering off $^{4}$ He: Toward the 3D Tomography of Nuclei

Measurement of the Differential and Total Cross Sections of the $γ d \to K^{0} Λ (p)$ Reaction within the Resonance Region

Photon beam asymmetry $Σ$ in the reaction $γ p \to p ω$ for $E_{γ}$ = 1.152 to 1.876 GeV

Differential Cross Section Measurements for $γ n \to π^{-} p$ Above the First Nucleon Resonance Region

Measurements of $e p \to e^{'} π^{+} π^{-} p^{'}$ Cross Sections with CLAS at $1.40 < W < 2.0$ GeV and $2.0 < Q^{2} < 5.0$ GeV $^{2}$

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

Photon beam asymmetry $Σ$ for $η$ and $η^{'}$ photoproduction from the proton

Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^{2} > 1$ GeV $^{2}$ . II. $e p \to e π^{0} p$