J. A. Fleming

Beam–target helicity asymmetry E in K+Σ− photoproduction on the neutron

N. Zachariou, D. P. Watts, J. A. Fleming, A. Sarantsev et autres

We report a measurement of a beam–target double-polarisation observable ( E ) for the γ → n → ( p ) → K + Σ − ( p ) reaction. The data were obtained impinging the circularly-polarised energy-tagged photon beam of Hall …

gb, de, ru, it, us, am, fr, cl, kr (code pays fourni par la source)

Beam-target helicity asymmetry E in K0Λ and K0Σ0 photoproduction on the neutron

Dao H. Ho, R. A. Schumacher, A. D’Angelo, A. Deur et autres

We report the first measurements of the $E$ beam-target helicity asymmetry for the $\stackrel{P\vec}{\ensuremath{\gamma}}\stackrel{P\vec}{n}\ensuremath{\rightarrow}{K}^{0}\mathrm{\ensuremath{\Lambda}}$ and ${K}^{0}{\mathrm{\ensuremath{\Sigma}}}^{0}$ channels in the energy range $1.70\ensuremath{\le}W\ensuremath{\le}2.34$ GeV. The CLAS system at Jefferson Lab uses a circularly polarized photon beam and a target consisting of longitudinally polarized …

us, it, gb, de, ru, fr, cl, am, kr (code pays fourni par la source)

Measurement of the differential and total cross sections of the γd→K0Λ(p) reaction within the resonance region

N. Compton, C. Taylor, K. Hicks, P. L. Cole et autres

We report the first measurement of differential and total cross sections for the $\ensuremath{\gamma}d\ensuremath{\rightarrow}{K}^{0}\mathrm{\ensuremath{\Lambda}}(p)$ reaction, using data from the CLAS detector at the Thomas Jefferson National Accelerator Facility. Data collected during two separate experimental runs were studied with photon-energy coverage 0.8--3.6 GeV …

us, gb, de, ru, it, kr, cl, am, fr (code pays fourni par la source)

First Exclusive Measurement of Deeply Virtual Compton Scattering off He4 : Toward the 3D Tomography of Nuclei

M. Hattawy, N. A. Baltzell, R. Dupré, K. Hafidi et autres

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 Facility (CEBAF) accelerator at Jefferson …

fr, us, it, cl, gb, ru, am, kr (code pays fourni par la source)

The Beam-Target Helicity Asymmetry for $\vec{\gamma} \vec{n} \rightarrow \pi^- p$ in the {\bf{$N^*$} Resonance Region

D. Ho, P. Peng, C.D. Bass, P. Collins et autres

We report the first beam-target double-polarization asymmetries in the $\gamma + n(p) \rightarrow \pi^- + p(p)$ reaction spanning the nucleon resonance region from invariant mass $W$= $1500$ to $2300$ MeV. Circularly polarized photons and longitudinally polarized deuterons in $H\!D$ have been used …

Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions

H. S. Jo, F. X. Girod, H. Avakian, V. D. Burkert et autres

Unpolarized and beam-polarized fourfold cross sections (d^{4}σ/dQ^{2}dx_{B}dtdϕ) for the ep→e^{'}p^{'}γ reaction were measured using the CLAS detector and the 5.75-GeV polarized electron beam of the Jefferson Lab accelerator, for 110 (Q^{2},x_{B},t) bins over the widest phase space ever explored in the valence-quark …

fr, us, gb, it, kr, ru, cl, am (code pays fourni par la source)

Induced polarization of Λ(1116) in kaon electroproduction

M. Gabrielyan, B. A. Raue, D. S. Carman, K. Park et autres

We have measured. the induced polarization of the $\ensuremath{\Lambda}$(1116) in the reaction $ep\ensuremath{\rightarrow}{e}^{\ensuremath{'}}{K}^{+}\ensuremath{\Lambda}$, detecting the scattered ${e}^{\ensuremath{'}}$ and ${K}^{+}$ in the final state along with the proton from the decay $\ensuremath{\Lambda}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{\ensuremath{-}}$. The present study used the CEBAF Large Acceptance Spectrometer (CLAS), which …

us, kr, it, fr, ru, cl, am, gb (code pays fourni par la source)

Precision measurements of g 1 of the proton and of the deuteron with 6 GeV electrons

Y. Prok, P. Bosted, N. D. Kvaltine, K. P. Adhikari et autres

The inclusive polarized structure functions of the proton and deuteron, ${g}_{1}^{p}$ and ${g}_{1}^{d}$, were measured with high statistical precision using polarized 6 GeV electrons incident on a polarized ammonia target in Hall B at Jefferson Laboratory. Electrons scattered at laboratory angles between …

us, it, gb, fr, cl, am, ru, kr (code pays fourni par la source)

Beam asymmetry Σ for π+ and π0 photoproduction on the proton for photon energies from 1.102 to 1.862 GeV

M. Dugger, B. G. Ritchie, P. Collins, E. Pasyuk et autres

Beam asymmetries for the reactions $\ensuremath{\gamma}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0}$ and $\ensuremath{\gamma}p\ensuremath{\rightarrow}n{\ensuremath{\pi}}^{+}$ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged, linearly polarized photon beam with energies from 1.102--1.862 GeV. A Fourier moment technique for extracting beam asymmetries from experimental data is …

us, ru, it, gb, fr, kr, am, cl, no (code pays fourni par la source)

Measurement of the Σπ photoproduction line shapes near the Λ(1405)

K. Moriya, R. A. Schumacher, K. P. Adhikari, D. Adikaram et autres

The reaction $\ensuremath{\gamma}+p\ensuremath{\rightarrow}{K}^{+}+\ensuremath{\Sigma}+\ensuremath{\pi}$ was used to determine the invariant mass distributions or ``line shapes'' of the ${\ensuremath{\Sigma}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\ensuremath{\Sigma}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, and ${\ensuremath{\Sigma}}^{0}{\ensuremath{\pi}}^{0}$ final states, from threshold at 1328 $\mathrm{MeV}/{c}^{2}$ through the mass range of the $\ensuremath{\Lambda}(1405)$ and the $\ensuremath{\Lambda}(1520)$. The measurements were made with …

us, it, gb, fr, kr, ru, am, cl (code pays fourni par la source)

Erratum: Simultaneous trapping of two different atomic species in a vapor-cell magneto-optical trap

Moises S. Santos, P. Nussenzveig, Luís Gustavo Marcassa, Kristian Helmerson et autres

Le laboratoire d’ éelectricitée

J. A. Fleming, A. M. Stefanini