Jason W. Mitchell
A5102988717- HIV/AIDS Research and Interventions
- Adolescent Sexual and Reproductive Health
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- HIV, Drug Use, Sexual Risk
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Sex work and related issues
- LGBTQ Health, Identity, and Policy
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Mobile Health and mHealth Applications
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Molecular Physics
- Attachment and Relationship Dynamics
- Healthcare Policy and Management
- Herpesvirus Infections and Treatments
- Dark Matter and Cosmic Phenomena
- Advanced Chemical Physics Studies
- Diabetes Management and Research
- Food Security and Health in Diverse Populations
- Magnetic confinement fusion research
Massachusetts General Hospital
1994-2024
Florida International University
2002-2024
United Kingdom Atomic Energy Authority
2024
Cystic Fibrosis Trust
2023
University of Michigan–Ann Arbor
2012-2021
Aristotle University of Thessaloniki
2021
Regional Medical Center
2020-2021
University of Hawaiʻi at Mānoa
2016-2020
Medical College of Wisconsin
2011-2020
Johns Hopkins Hospital
2020
Measurements are reported of the proton and deuteron spin structure functions ${g}_{1}^{p}$ ${g}_{1}^{d}$ at beam energies 29.1, 16.2, 9.7 GeV, ${g}_{2}^{p}$ ${g}_{2}^{d}$ a energy 29.1 GeV. The integrals ${\ensuremath{\Gamma}}_{p}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{p}{(x,Q}^{2})dx$ ${\ensuremath{\Gamma}}_{d}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{d}{(x,Q}^{2})dx$ were evaluated fixed ${Q}^{2}=3(\mathrm{GeV}{/c)}^{2}$ using full data set to yield...
We have measured the ratio $\frac{{g}_{1}^{p}}{{F}_{1}^{p}}$ over range $0.029<x<0.8$ and $1.3<{Q}^{2}<10$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ using deep-inelastic scattering of polarized electrons from ammonia. An evaluation integral $\ensuremath{\int}{0}^{1}{g}_{1}^{p}(x, {Q}^{2})\mathrm{dx}$ at fixed ${Q}^{2}=3$ yields 0.127\ifmmode\pm\else\textpm\fi{}0.004(stat)\ifmmode\pm\else\textpm\fi{}0.010(syst), in agreement with previous experiments, but well below Ellis-Jaffe sum...
Separated longitudinal and transverse structure functions for the reaction 1H(e,e(')pi(+))n were measured in momentum transfer region Q2 = 0.6--1.6 (GeV/c)(2) at a value of invariant mass W 1.95 GeV. New values pion charge form factor extracted from cross section by using recently developed Regge model. The results indicate that this is larger than previously assumed consistent with monopole parametrization fitted to very low elastic data.
We present measurements of the ratio proton elastic electromagnetic form factors, μpGEp/GMp. The Jefferson Lab Hall A Focal Plane Polarimeter was used to determine longitudinal and transverse components recoil polarization in ep scattering; these is proportional two factors. These data reproduce observation Jones et al. [Phys. Rev. Lett. 84, 1398 (2000)], that factor decreases significantly from unity above Q2=1GeV2.Received 29 May 2001DOI:https://doi.org/10.1103/PhysRevC.64.038202©2001...
The charged pion form factor, ${F}_{\ensuremath{\pi}}({Q}^{2})$, is an important quantity that can be used to advance our knowledge of hadronic structure. However, the extraction ${F}_{\ensuremath{\pi}}$ from data requires a model ${}^{1}\mathrm{H}(e,{e}^{'}{\ensuremath{\pi}}^{+})n$ reaction and thus inherently dependent. Therefore, detailed description factor electroproduction obtained recently at Jefferson Lab presented, with particular focus given dominant uncertainties in this procedure....
We report on a high-statistics measurement of the deuteron spin structure function ${g}_{1}^{d}$ at beam energy 29 GeV in kinematic range $0.029<x<0.8$ and $1<{Q}^{2}<10$ (GeV $/c$${)}^{2}$. The integral ${\ensuremath{\gamma}}_{1}^{d}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{\int}{1}^{}{g}_{1}^{d}\mathrm{dx}$ evaluated fixed ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3$ $/c$${)}^{2}$ gives...
The data analysis for the reaction H(e,e' pi^+)n, which was used to determine values charged pion form factor Fpi of Q^2=0.6-1.6 GeV^2, has been repeated with careful inspection all steps and special attention systematic uncertainties. Also method extract from measured longitudinal cross section critically reconsidered. Final separated transverse sections extracted are presented.
We have measured the parity-violating electroweak asymmetry in elastic scattering of polarized electrons from protons. Significant contributions to this could arise strange form factors nucleon. The is $A=\ensuremath{-}15.05\ifmmode\pm\else\textpm\fi{}0.98(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.56(\mathrm{syst})\phantom{\rule{0.3em}{0ex}}\mathrm{ppm}$ at kinematic point $⟨{\ensuremath{\theta}}_{\mathrm{lab}}⟩=12.3\ifmmode^\circ\else\textdegree\fi{}$ and...
ANY MEDICARE BENEFIciaries have serious illnesses and disabilities receive services from multiple clinicians health care settings, engendering risks of errors in transitions 1-3 rehospitalizations. 4[7][8][9][10][11] The Centers for Medicare & Medicaid Services (CMS) piloted various strategies improving reducing costs 2006-2007, including one that tested having Quality Improvement Organizations (QIOs) lead improvements transitions.Medicare's QIOs serve each state territory, aiming to improve...
Research has shown that gay male couples' sexual agreements may affect their risk for HIV. Few U.S. studies have collected dyadic data nationally from couples to assess what behaviors they allow occur by agreement type and the sequence of when certain within relationships. In our cross-sectional study, a convenience sample 361 were electronically throughout United States using paid Facebook ads. Findings revealed discussed HIV status before having unprotected anal intercourse (UAI) but...
Context.— The need for appropriate specimen use ancillary testing has become more commonplace in the practice of pathology. This, coupled with improvements technology, often provides less invasive methods testing, but presents new challenges to collection and handling these small specimens, including thoracic biopsy cytology samples. Objective.— To develop a clinical guideline recommendations on how obtain, handle, process tissue specimens diagnostic studies. Methods.— College American...
HIV prevalence remains high among men who have sex with (MSM) in the United States, yet majority of research has focused on MSM as individuals, not dyads, and discussed risks primarily context casual sex. Nexus is an online prevention program that combines home-based testing couples counseling (CHTC). It allows partners dyadic relationships to receive care comfort their designated residence, via video-based chat. By using technologies (eg, VSee video chat), male support from a remote...
New measurements are reported on the deuteron spin structure function g_1^d. These results were obtained from deep inelastic scattering of 48.3 GeV electrons polarized deuterons in kinematic range 0.01 < x 0.9 and 1 Q^2 40 (GeV/c)^2. first high dose electron data using lithium deuteride (6Li2H) as target material. Extrapolations performed to obtain moments g_1^d, including Gamma_1^d, net quark polarization Delta Sigma.
We studied the electroproduction of $\ensuremath{\Delta}(1232)$ resonance via reaction $p({e,e}^{\ensuremath{'}}p){\ensuremath{\pi}}^{0}$ at four-momentum transfers ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2.8\mathrm{and}4.0{\mathrm{GeV}}^{2}$. This is highest ${Q}^{2}$ for which exclusive has ever been observed. Decay angular distributions $\ensuremath{\Delta}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0}$ were measured over a wide range barycentric energies covering...
We report the first measurement using a solid polarized target of neutron electric form factor G(n)(E) via d-->(e-->,e(')n)p. was determined from beam-target asymmetry in scattering longitudinally electrons deuterated ammonia ( 15ND3). The performed Hall C at Thomas Jefferson National Accelerator Facility quasifree kinematics with polarization perpendicular to momentum transfer. were detected magnetic spectrometer coincidence neutrons large angle segmented detector. find =...
We have measured the spin structure functions g2p and g2d virtual photon asymmetries A2p A2d over kinematic range 0.02⩽x⩽0.8 0.7⩽Q2⩽20GeV2 by scattering 29.1 32.3 GeV longitudinally polarized electrons from transversely NH3 6LiD targets. Our g2 approximately follows twist-2 Wandzura–Wilczek calculation. The twist-3 reduced matrix elements d2p d2n are less than two standard deviations zero. data inconsistent with Burkhardt–Cottingham sum rule if there is no pathological behavior as x→0....
We report new measurements of the ratio electric form factor to magnetic neutron, G(n)(E)/G(n)(M), obtained via recoil polarimetry from quasielastic 2H(e-->,e(')n-->)1H reaction at Q2 values 0.45, 1.13, and 1.45 (GeV/c)(2) with relative statistical uncertainties 7.6% 8.4% two higher points, which points have never been achieved in polarization measurements.
The electric form factor of the neutron was determined from measurements $\stackrel{\ensuremath{\rightarrow}}{d}(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{\ensuremath{'}}n)p$ reaction for quasielastic kinematics. Polarized electrons were scattered off a polarized deuterated ammonia ($^{15}\mathrm{N}\mathrm{D}_{3}$) target in which deuteron polarization perpendicular to momentum transfer. detected magnetic spectrometer coincidence with neutrons large solid angle detector. We find...
Recoil proton polarization observables were measured for both the p(e→,e′p→) and d(e→,e′p→)n reactions at two values of Q2 using a newly commissioned focal plane polarimeter MIT-Bates Linear Accelerator Center. The hydrogen deuterium spin-dependent Dℓℓ Dℓt, induced Pn, form factor ratio GEp/GMp under identical kinematics. results are in good agreement with each other plane-wave impulse approximation (PWIA).Received 8 August 1997DOI:https://doi.org/10.1103/PhysRevLett.80.452©1998 American...
We have measured proton and deuteron virtual photon-nucleon asymmetries ${A}_{2}^{p}$ ${A}_{2}^{d}$ structure functions ${g}_{2}^{p}$ ${g}_{2}^{d}$ over the range $0.03<x<0.8$ $1.3<{Q}^{2}<10(\mathrm{GeV}/c{)}^{2}$ by inelastically scattering polarized electrons off ammonia targets. Results for ${A}_{2}$ are significantly smaller than positivity limit $\sqrt{R}$ both Within experimental precision ${g}_{2}$ data well described twist-2 contribution, ${g}_{2}^{\mathrm{WW}}$. Twist-3 matrix...