A5006892870- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Insect and Pesticide Research
- Nuclear Physics and Applications
- Plant and animal studies
- Insect and Arachnid Ecology and Behavior
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Social Policy and Reform Studies
- Medical Imaging Techniques and Applications
- Animal Behavior and Reproduction
- Neurobiology and Insect Physiology Research
- Amphibian and Reptile Biology
- Inorganic Fluorides and Related Compounds
- Radiation Detection and Scintillator Technologies
- Primate Behavior and Ecology
- Work-Family Balance Challenges
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Homelessness and Social Issues
Weber State University
2021-2024
University of North Carolina Wilmington
2007-2024
Oklahoma State University
2017-2021
Case Western Reserve University
2021
Indiana University Bloomington
1999-2012
Massachusetts Institute of Technology
2000-2008
National Superconducting Cyclotron Laboratory
2003
Indiana University
2003
We report on the measurement of γp→J/ψp cross section from E_{γ}=11.8 GeV down to threshold at 8.2 using a tagged photon beam with GlueX experiment. find that total falls toward less steeply than expected two-gluon exchange models. The differential dσ/dt has an exponential slope 1.67±0.39 GeV^{-2} 10.7 average energy. LHCb pentaquark candidates P_{c}^{+} can be produced in s channel this reaction. see no evidence for them and set model-dependent upper limits their branching fractions...
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 have measured the transverse asymmetry ${A}_{{T}^{\ensuremath{'}}}$ in ${}^{3}\stackrel{\ensuremath{\rightarrow}}{\mathrm{He}}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}})$ quasielastic scattering Hall A at Jefferson Laboratory with high precision for ${Q}^{2}$ values from 0.1 to $0.6(\mathrm{GeV}/c{)}^{2}$. The neutron magnetic form factor ${G}_{M}^{n}$ was extracted based on Faddeev calculations ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.1$ and...
We report measurements of the photon beam asymmetry $\Sigma$ for reactions $\vec{\gamma}p\to p\pi^0$ and p\eta $ from GlueX experiment using a 9 GeV linearly-polarized, tagged incident on liquid hydrogen target in Jefferson Lab's Hall D. The asymmetries, measured as function proton momentum transfer, possess greater precision than previous $\pi^0$ are first $\eta$ this energy regime. results compared with theoretical predictions based $t$-channel, quasi-particle exchange constrain...
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 liquid hydrogen targets, much detector has been commissioned. All systems are now performing or near design specifications events being fully reconstructed, including exclusive production π0, η ω mesons. Linearly-polarized photons successfully produced through coherent bremsstrahlung polarization transfer to ρ observed.
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...
A high precision measurement of the transverse spin-dependent asymmetry ${A}_{{T}^{\ensuremath{'}}}$ in ${}^{3}\mathrm{He}\ensuremath{\rightarrow}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}})$ quasielastic scattering was performed Hall at Jefferson Lab values squared four-momentum transfer, ${Q}^{2},$ between 0.1 and 0.6 $(\mathrm{G}\mathrm{e}\mathrm{V}/{c)}^{2}.$ is sensitive to neutron magnetic form factor, ${G}_{M}^{n}.$ Values ${G}_{M}^{n}$ ${Q}^{2}=0.1$...
We present data on the inclusive scattering of polarized electrons from a 3He target at energies 0.862 to 5.06 GeV, obtained angle 15.5°. Our include measurements quasielastic peak, through nucleon resonance region, and beyond, were used determine virtual photon cross-section difference σ1/2−σ3/2. extract extended Gerasimov-Drell-Hearn integral for neutron in range four-momentum transfer squared Q2 0.1–0.9 GeV2.Received 15 May 2002DOI:https://doi.org/10.1103/PhysRevLett.89.242301©2002...
We have measured the spin structure functions $g_1$ and $g_2$ of $^3$He in a double-spin experiment by inclusively scattering polarized electrons at energies ranging from 0.862 to 5.07 GeV off target 15.5$^{\circ}$ angle. Excitation covered resonance onset deep inelastic regions. determined for first time $Q^2$ evolution $\Gamma_1(Q^2)=\int_0^{1} g_1(x,Q^2) dx$, $\Gamma_2(Q^2)=\int_0^1 g_2(x,Q^2) dx$ $d_2 (Q^2) = \int_0^1 x^2[ 2g_1(x,Q^2) + 3g_2(x,Q^2)] neutron range 0.1 GeV$^2$ $\leq Q^2...
We have measured the transverse asymmetry AT' in quasielastic 3He→(e→,e') process with high precision at Q2 values from 0.1 to 0.6(GeV/c)2. The neutron magnetic form factor GMn was extracted of and 0.2(GeV/c)2 using a nonrelativistic Faddeev calculation which includes both final-state interactions (FSI) meson-exchange currents (MEC). Theoretical uncertainties due FSI MEC effects were constrained measurement spin-dependent threshold region 3He→(e→,e'). also 0.3 0.6(GeV/c)2 based on plane wave...
Isospin is a good quantum number under the assumption that nuclear interaction charge independent. An analogous structure of excited states expected for nuclei with same mass $A$ but different $z$ components ${T}_{z}$ isospin $T$, where ${T}_{z}=(N\ensuremath{-}Z)/2$. The has been studied isobaric $^{58}\mathrm{Ni}$ and $^{58}\mathrm{Cu}$ by comparing transitions from ground state (initial ${T}_{i}=1$ ${J}^{\ensuremath{\pi}}={0}^{+}$) to $M1$ Gamow-Teller (GT)...
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 generalized forward spin polarizabilities γ0 and δLT of the neutron have been extracted for first time in a Q2 range from 0.1 to 0.9 GeV2. Since is sensitive nucleon resonances insensitive Δ resonance, it expected that pair should provide benchmark tests current understanding chiral dynamics QCD. new results on show significant disagreement with perturbation theory calculations, while data at low are good agreement next-to-leading-order relativistic baryon calculation. phenomenological...
We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab be used with the GlueX experimental setup for strange hadron spectroscopy. The superior CEBAF electron will enable flux on order $1\times 10^4~K_L/sec$, which exceeds that previously attained SLAC by three orders magnitude. use deuteron target provide first measurements ever neutrons. experiment measure both differential cross sections and self-analyzed polarizations produced $Λ$, $Σ$, $Ξ$, $Ω$ hyperons using...
The Gamow-Teller transition strengths, $B$(GT), in $pf$-shell nuclei are of interest nuclear physics as well astrophysics. A high-resolution (${}^{3}\mathrm{He},t$) charge-exchange (CE) reaction was performed on the ${T}_{z}=+1$ nucleus ${}^{54}$Fe at 0${}^{\ensuremath{\circ}}$ and an intermediate incident energy 140 MeV/nucleon for study precise GT strengths to final ${T}_{z}=0$ ${}^{54}$Co. By applying dispersion matching techniques a high-quality ${}^{3}$He beam RCNP, resolution 21 keV...
Conditioned taste aversion (CTA) learning is a highly specialized form of conditioning found across taxa that leads to avoidance an initially neutral stimulus, such as or odor, associated with, but not the cause of, detrimental health condition. This study examines if honey bees (Apis mellifera L.) develop ethanol (EtOH)-induced CTA.Restrained were first administered sucrose solution was cinnamon scented, lavender unscented, and contained either 0, 2.5, 5, 10, 20% EtOH. Then, 30 minutes...
We report on the measurement of beam asymmetry $\mathrm{\ensuremath{\Sigma}}$ for reactions $\stackrel{P\vec}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}p\ensuremath{\eta}$ and $\stackrel{P\vec}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}p{\ensuremath{\eta}}^{\ensuremath{'}}$ from GlueX experiment using an 8.2--8.8-GeV linearly polarized tagged photon incident a liquid hydrogen target in Hall D at Jefferson Laboratory. These measurements are made as function momentum transfer...
Ethanol consumption has been shown to have many deleterious effects, including behavioral alterations, motor deficits, reduction in inhibition, and alteration of neurochemical expression. These effects occur the wide variety species that consume ethanol. Although studies examined aversive conditioning honey bees (Apis mellifera), few role intoxication on acquisition learning such paradigms. The current study continues a line research using as model explore ethanol toxicity. A passive...
We present a measurement of the spin-dependent cross sections for 3He over -->(e -->,e')X reaction in quasielastic and resonance regions at four-momentum transfer 0.1< or =Q2< =0.9 GeV2. The spin-structure functions have been extracted used to evaluate nuclear Burkhardt-Cottingham extended Gerasimov-Drell-Hearn sum rules first time. data are also compared an impulse approximation calculation exact three-body Faddeev region.
The primary motivation of the GlueX experiment is to search for and ultimately study pattern gluonic excitations in meson spectrum produced $γp$ collisions. Recent lattice QCD calculations predict a rich hybrid mesons that have both exotic non-exotic $J^{PC}$, corresponding $q\bar{q}$ states ($q=u,$ $d,$ or $s$) coupled with field. A thorough spectrum, including identification isovector triplet, charges 0 $\pm1$, isoscalar members, $|s\bar{s}\ >$ $|u\bar{u}\ > + |d\bar{d}\ >$, each...
Aluminum is the third most prevalent element in earth's crust. In conditions, it tightly bound to form inaccessible compounds, however low soil pH, ionized of aluminum can be taken up by plant roots and distributed throughout tissue. Following this uptake, nectar pollen concentrations pH regions reach nearly 300 mg/kg. Inhibition acetylcholinesterase (AChE) has been demonstrated following exposure mammal aquatic invertebrate species. honey bees, behaviors consistent with AChE inhibition have...
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...