M. R. Shepherd
A5041264972- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Impact of Technology on Adolescents
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Digital Mental Health Interventions
- Nuclear physics research studies
- Nuclear Physics and Applications
- Neutrino Physics Research
- Sexuality, Behavior, and Technology
- Particle Accelerators and Free-Electron Lasers
- Child Development and Digital Technology
- Dark Matter and Cosmic Phenomena
- Motivation and Self-Concept in Sports
- Youth Development and Social Support
- Child and Adolescent Psychosocial and Emotional Development
- Black Holes and Theoretical Physics
- Radioactive Decay and Measurement Techniques
- Perfectionism, Procrastination, Anxiety Studies
- Algorithms and Data Compression
- Superconducting Materials and Applications
- Chemical Synthesis and Analysis
National and Kapodistrian University of Athens
2023
Ruhr University Bochum
2023
Indiana University Bloomington
2008-2022
Corvallis Environmental Center
2022
Duke University
2021
William & Mary
2021
Williams (United States)
2021
Northwestern University
2021
University of Auckland
2020
Campbell Collaboration
2004
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 present final measurements of 13 charmless hadronic B decay modes from the CLEO experiment. The include ten ππ, Kπ, and KK states new limits on dibaryonic states, p¯p, p¯Λ, Λ¯Λ, as well a determination ratio B(→BDK)/B(→BDπ). results are based full II III data samples totalling 15.3fb−1 at Υ(4S), supercede previously published results.Received February 2003Corrected 6 June 2007DOI:https://doi.org/10.1103/PhysRevD.68.052002©2003 American Physical Society
Thermoplastic immobilizers are used routinely in radiation therapy to achieve positioning accuracy. These devices variable quality as they dependent on the skill of human fabricator. We examine potential multi jet fusion (MJF) 3D printing for production with a focus surface dosimetry several MJF-printed PA12-based material candidates. Materials compared goal minimizing dose comparison standard thermoplastic. introduce novel metamaterial design shell immobilizer, aims mechanical robustness...
A partial wave analysis of the π0π0 system produced in charge exchange reaction π−p→π0π0n at an incident momentum 18.3 GeV/c is presented as a function invariant mass mπ0π0 and transfer squared |t| from π− to outgoing system. For small values |t|, S-wave intensity shows broad enhancement low with sharp dip vicinity f0(980). also observed f0(1500). There rapid variation S D0 relative phase difference these regions. large f0(980) appears bump. The f2(1270), D waves, dominantly by π a2 higher...
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...
The GlueX experiment was designed to search for and study the pattern of gluonic excitations in meson spectrum produced through photoproduction reactions at a new tagged photon beam facility Hall D Jefferson Laboratory. particle identification capabilities will be enhanced by constructing DIRC (Detection Internally Reflected Cherenkov light) detector, utilizing components decommissioned BaBar DIRC. allow systematic studies kaon final states that are essential inferring quark flavor content...
The GLUEX experiment, to be constructed in the new Hall D at Jefferson Lab as part of 12 GeV upgrade, will utilize a linearly polarized 9 photon beam, produced via coherent bremsstrahlung radiation off diamond wafer, incident on proton target conduct search for exotic hybrid mesons. A summary physics motivation experiment and key factors that drive design detector beam line is presented.
We propose to enhance the kaon identification capabilities of GlueX detector by constructing an FDIRC (Focusing Detection Internally Reflected Cherenkov) utilizing decommissioned BaBar DIRC components. The would significantly physics program allowing one search for and study hybrid mesons decaying into final states. Such systematic studies states are essential inferring quark flavor content conventional mesons. reuse one-third synthetic fused silica bars that were utilized in DIRC. A new...
The primary motivation of the GlueX experiment is to search for and ultimately study pattern gluonic excitations in meson spectrum produced gamma p collisions. Recent lattice QCD calculations predict a rich hybrid mesons that have both exotic non-exotic JPC, corresponding q q-bar (q=u, d, or s) states coupled with field. A thorough spectrum, including identification isovector triplet, charges 0 +-1, isoscalar members, |s s-bar> |u u-bar> + |d d-bar>, each predicted combination may only be...
The GlueX Experiment, which is currently under construction as a component of the 12 GeV upgrade to Jefferson Lab, will utilize photoproduction on proton target search for hybrid mesons in light quark sector.Recent first-principles calculations hadron spectrum Quantum Chromodynamics suggest presence bound states meson that cannot arise from and an anti-quark.Such appear have valance gluonic content or degrees freedom are called mesons.An interesting subset these, "exotic mesons," total...
The GLUEX experiment is located in experimental Hall D at Jefferson Lab (JLab) and provides a unique capability to search for hybrid mesons high-energy photoproduction, utilizing ∼9 GeV linearly polarized photon beam. initial, low-intensity phase of was recently completed high-intensity has begun 2020 which includes an upgraded kaon identification system, known as the DIRC (Detection Internally Reflected Cherenkov light), components from decommissioned BaBar DIRC. final states will...
Background Internet interventions for improving health and well-being have the potential to reach many people fill gaps in service provision. Serious gaming interfaces provide opportunities optimize user adherence impact. Health based theory evidence tailored psychological constructs been found be more effective promote behavior change. Defining design elements which engage users help them meet their goals can contribute better informed serious games. Objective To elucidate important SPARX,...
Received 17 August 2007DOI:https://doi.org/10.1103/PhysRevLett.99.089903©2007 American Physical Society
The GLUEX experiment takes place in experimental Hall D at Jefferson Lab (JLab). With a linearly polarized photon beam of up to 12 GeV energy, is dedicated search for hybrid mesons via photoproduction reactions. low-intensity (Phase I) was recently completed; the high-intensity II) started 2020 including an upgraded particle identification system, known as DIRC (Detection Internally Reflected Cherenkov light), utilizing components from decommissioned BaBar experiment. and separation kaon...
BACKGROUND: Depression is a major health issue among Māori indigenous adolescents, yet there has been little investigation into the relevance or effectiveness of psychological treatments for them. Further, consumer views are critical engagement and adherence to therapy. However, research regarding communities' opinions about interventions depression. OBJECTIVE: The objective this study was conduct semistructured interviews with (indigenous New Zealand) young people (taitamariki) their...