C. A. Meyer
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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: Ambiguities in the partial-wave analysis of the photoproduction of pairs of pseudoscalar mesons
Ambiguities in the partial-wave analysis of the photoproduction of pairs of pseudoscalar mesons Open
Applying the technique of partial-wave analysis, there are cases where more than one set of underlying complex-valued amplitudes can describe the measured observables. These ambiguities can sometimes be resolved using additional informatio…
View article: First Measurement of $a^0_2(1320)$ Polarized Photoproduction Cross Section
First Measurement of $a^0_2(1320)$ Polarized Photoproduction Cross Section Open
We measure for the first time the differential photoproduction cross section $dσ/dt$ of the $a_2(1320)$ meson at an average photon beam energy of 8.5~GeV, using data with an integrated luminosity of 104~pb$^{-1}$ collected by the GlueX exp…
View article: Upper Limit on the Photoproduction Cross Section of the Spin-Exotic $π_1(1600)$
Upper Limit on the Photoproduction Cross Section of the Spin-Exotic $π_1(1600)$ Open
The spin-exotic hybrid meson $π_{1}(1600)$ is predicted to have a large decay rate to the $ωππ$ final state. Using 76.6~pb$^{-1}$ of data collected with the GlueX detector, we measure the cross sections for the reactions $γp \to ωπ^+ π^- p…
View article: Measurement of Spin-Density Matrix Elements in $Δ^{++}(1232)$ photoproduction
Measurement of Spin-Density Matrix Elements in $Δ^{++}(1232)$ photoproduction Open
We measure the spin-density matrix elements (SDMEs) of the $Δ^{++}(1232)$ in the photoproduction reaction $γp \to π^-Δ^{++}(1232)$ with the GlueX experiment in Hall D at Jefferson Lab. The measurement uses a linearly--polarized photon beam…
View article: 50 Years of quantum chromodynamics
50 Years of quantum chromodynamics Open
Quantum Chromodynamics, the theory of quarks and gluons, whose interactions can be described by a local SU(3) gauge symmetry with charges called “color quantum numbers”, is reviewed; the goal of this review is to provide advanced Ph.D. stu…
View article: Measurement of Spin-Density Matrix Elements in $ρ(770)$ Production with a Linearly Polarized Photon Beam at $E_γ= 8.2\,-\,8.8\,\text{GeV}$
Measurement of Spin-Density Matrix Elements in $ρ(770)$ Production with a Linearly Polarized Photon Beam at $E_γ= 8.2\,-\,8.8\,\text{GeV}$ Open
The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized $8.5\,\text{GeV}$ photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neut…
View article: Measurement of the J/$ψ$ photoproduction cross section over the full near-threshold kinematic region
Measurement of the J/$ψ$ photoproduction cross section over the full near-threshold kinematic region Open
We report the total and differential cross sections for $J/ψ$ photoproduction with the large acceptance GlueX spectrometer for photon beam energies from the threshold at 8.2~GeV up to 11.44~GeV and over the full kinematic range of momentum…
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: Coupled Channel Analysis of $\bar{p} p \rightarrow π^0 π^0 η$, $π^0 ηη$ and $K^+ K^- π^0$ at 900 $MeV/c$ and of $ππ$-Scattering Data
Coupled Channel Analysis of $\bar{p} p \rightarrow π^0 π^0 η$, $π^0 ηη$ and $K^+ K^- π^0$ at 900 $MeV/c$ and of $ππ$-Scattering Data Open
A partial wave analysis of antiproton-proton annihilation data in flight at 900 $MeV/c$ into $π^0 π^0 η$ , $π^0 ηη$ and $K^+ K^- π^0$ is presented. The data were taken at LEAR by the Crystal Barrel experiment in 1996. The three channels ha…
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: 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: First results on nucleon resonance photocouplings from the $γp \to π^+π^-p$ reaction
First results on nucleon resonance photocouplings from the $γp \to π^+π^-p$ reaction Open
© 2018 The Author 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 ra…
View article: Measurement of the beam asymmetry Σ for π0 and η photoproduction on the proton at Eγ=9 GeV
Measurement of the beam asymmetry Σ for π0 and η photoproduction on the proton at Eγ=9 GeV Open
We report measurements of the photon beam asymmetry Σ for the reactions ⃗γp→pπ0 and ⃗γp→pη from the GlueX experiment using a 9 GeV linearly polarized, tagged photon beam incident on a liquid hydrogen target in Jefferson Lab's Hall D. The asy…
View article: Target and Beam-Target Spin Asymmetries in Exclusive $\pi^+$ Electroproduction for $Q^2>1$ GeV$^2$
Target and Beam-Target Spin Asymmetries in Exclusive $\pi^+$ Electroproduction for $Q^2>1$ GeV$^2$ Open
Target and beam-target spin asymmetries in exclusive $\pi^+$ electroproduction ($\gamma^* p \to n \pi^+$) were obtained from scattering of 6~GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large …
View article: First results from the GlueX experiment
First results from the GlueX experiment Open
© 2016 Author(s). The GlueX experiment at Jefferson Lab ran with its first commissioning beam in late 2014 and the spring of 2015. Data were collected on both plastic and liquid hydrogen targets, and much of the detector has been commissio…