Z. Baldwin
A5020479842- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Advancements in Photolithography Techniques
- Medical Imaging Techniques and Applications
- Quantum Information and Cryptography
- Particle Accelerators and Free-Electron Lasers
- Algebraic and Geometric Analysis
- Atomic and Molecular Physics
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Photonic and Optical Devices
Carnegie Mellon University
2021-2024
We report the total and differential cross sections for $J/\psi$ photoproduction with large acceptance GlueX spectrometer photon beam energies from threshold at 8.2~GeV up to 11.44~GeV over full kinematic range of momentum transfer squared, $t$. Such coverage facilitates extrapolation forward ($t = 0$) point beyond physical region. The section is used by many theoretical models plays an important role in understanding its relation $J/\psi-$proton interaction. These measurements near are also...
We measure for the first time differential photoproduction cross section $d\sigma/dt$ of $a_2(1320)$ meson at an average photon beam energy 8.5~GeV, using data with integrated luminosity 104~pb$^{-1}$ collected by GlueX experiment. fully reconstruct $\gamma p \to \eta\pi^0 p$ reaction and perform a partial-wave analysis in mass region amplitudes that incorporate linear polarization beam. This allows us to separate contributions natural- unnatural-parity exchanges. These measurements provide...
We present a search for axionlike particles, $a$, produced in photon-proton collisions at center-of-mass energy of approximately 4 GeV, focusing on the scenario where $a$-gluon coupling is dominant. The uses $a\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ and $a\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decays, data sample corresponding to an integrated luminosity $168\text{ }\text{...
The spin-exotic hybrid meson π1(1600) is predicted to have a large decay rate the ωππ final state. Using 76.6 pb−1 of data collected with GlueX detector, we measure cross sections for reactions γp→ωπ+π−p, γp→ωπ0π0p, and γp→ωπ−π0Δ++ in range Eγ=8–10 GeV. isospin conservation, set first upper limits on photoproduction π10(1600) π1−(1600). We combine these lattice calculations widths find that η′π most sensitive two-body system search π1(1600). locked icon Physics Subject Headings...
The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5GeV photons impinging on a hydrogen target which is contained within detector with near-complete coverage for charged and neutral particles. We present measurements spin-density matrix elements the vector meson ρ(770). statistical precision achieved exceeds that previous experiments in this energy range by orders magnitude. confirm high degree s-channel helicity conservation small squared...
We report on the measurement of spin density matrix elements $\mathrm{\ensuremath{\Lambda}}(1520)$ in photoproduction reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}(1520){K}^{+}$, via its subsequent decay to ${K}^{\ensuremath{-}}p$. The was performed as part GlueX experimental program Hall D at Jefferson Laboratory using a linearly polarized photon beam with...
We report a measurement of the π− photoproduction beam asymmetry for reaction →γp→π−Δ++ using data from GlueX experiment in photon energy range 8.2–8.8 GeV. The Σ is measured as function four-momentum transfer t to Δ++ and compared phenomenological models. find that varies t: negative at smaller values positive higher |t|. can be described theoretically by t-channel particle exchange requiring pseudoscalar, vector, tensor intermediaries. In particular, this requires charge exchange, allowing...
The spin-exotic hybrid meson $\pi_{1}(1600)$ is predicted to have a large decay rate the $\omega\pi\pi$ final state. Using 76.6~pb$^{-1}$ of data collected with GlueX detector, we measure cross sections for reactions $\gamma p \to \omega \pi^+ \pi^- p$, \pi^0 and p\to\omega\pi^-\pi^0\Delta^{++}$ in range $E_\gamma =$ 8-10 GeV. isospin conservation, set first upper limits on photoproduction $\pi^{0}_{1}(1600)$ $\pi^{-}_{1}(1600)$. We combine these lattice calculations widths find that...
We describe the formalism to analyze mathematical ambiguities arising in partial-wave analysis of two spinless mesons produced with a linearly polarized photon beam. show that partial waves are uniquely defined when all accessible observables considered, for wave set which includes $S$ and $D$ waves. The inclusion higher does not affect our results, we conclude there no present Monte Carlo simulations illustrate results.
We describe the formalism to analyze mathematical ambiguities arising in partial-wave analysis of two spinless mesons produced with a linearly polarized photon beam. show that partial waves are uniquely defined when all accessible observables considered, for wave set which includes $S$ and $D$ waves. The inclusion higher does not affect our results, we conclude there no present Monte Carlo simulations illustrate results.