K. Chadwick
A5084049630- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Distributed and Parallel Computing Systems
- Dark Matter and Cosmic Phenomena
- Crystallography and molecular interactions
- Voice and Speech Disorders
- Particle Detector Development and Performance
- Advanced Data Storage Technologies
- Dysphagia Assessment and Management
- Scientific Computing and Data Management
- Neutrino Physics Research
- Cloud Computing and Resource Management
- Tracheal and airway disorders
- Calcium Carbonate Crystallization and Inhibition
- Cloud Data Security Solutions
- IoT and Edge/Fog Computing
- Particle Accelerators and Free-Electron Lasers
- nanoparticles nucleation surface interactions
- Access Control and Trust
- Analytical Chemistry and Chromatography
- Chemical and Physical Properties in Aqueous Solutions
- Crystal structures of chemical compounds
Stony Brook University
2021-2024
Cornell University
1983-2021
New York Hospital Queens
2019-2021
Presbyterian Hospital
2019-2021
NewYork–Presbyterian Hospital
2019-2021
Oregon Health & Science University
2017-2019
Purdue University West Lafayette
1987-2017
University of California, Los Angeles
2017
Fermi National Accelerator Laboratory
1993-2015
Virginia Commonwealth University
2013-2014
The production and event topology of three-jet events produced in p¯p collisions at √s=1.8 TeV have been studied with the Collider Detector Fermilab Tevatron Collider. distributions angular variables (ψ∗ cosθ∗) describing energy sharing between jets (x3 x4) are found to agree well tree-level QCD calculations. These predicted different shapes for initial-state subprocesses (quark-antiquark, quark-gluon, gluon-gluon). data consistent small expected contribution from quark-antiquark initial...
Inclusive J/\ensuremath{\psi} and \ensuremath{\psi}(2S) production has been studied in p\ifmmode\bar\else\textasciimacron\fi{}p collisions at \ensuremath{\surd}s =1.8 TeV using 2.6\ifmmode\pm\else\textpm\fi{}0.2 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ of data taken with the Collider Detector Fermilab. The products cross section times branching fraction were measured as functions ${\mathit{P}}_{\mathit{T}}$ for...
We present measurements of the pseudorapidity (η) distribution charged particles (dNchdη) produced within |η|≤3.5 in proton-antiproton collisions at √s 630 and 1800 GeV. measure dNchdη η=0 to be 3.18±0.06(stat)±0.10(syst) GeV, 3.95±0.03 (stat)±0.13(syst) Many systematic errors ratio two energies cancel, we 1.26±0.01±0.04 for GeV that |η|≤3. Comparing lower-energy data, observe an increase faster than ln(s) η=0.Received 2 October 1989DOI:https://doi.org/10.1103/PhysRevD.41.2330©1990 American...
We report a measurement of the proton-antiproton total cross section ${\mathrm{\ensuremath{\sigma}}}_{\mathit{T}}$ at c.m.s. energies \ensuremath{\surd}s =546 and 1800 GeV. Using luminosity-independent method, we find ${\mathrm{\ensuremath{\sigma}}}_{\mathit{T}}$=61.26\ifmmode\pm\else\textpm\fi{}0.93 mb GeV 80.03\ifmmode\pm\else\textpm\fi{}2.24 =1800 In this energy range, ratio ${\mathrm{\ensuremath{\sigma}}}_{\mathrm{el}}$/${\mathrm{\ensuremath{\sigma}}}_{\mathit{T}}$ increases from...
Measurements of inclusive transverse-momentum spectra for charged particles produced in proton-antiproton collisions at √2 630 and 1800 GeV are presented compared with data taken lower energies.Received 8 June 1988DOI:https://doi.org/10.1103/PhysRevLett.61.1819©1988 American Physical Society
Kinematic properties of four-jet events produced in $p\overline{p}$ collisions at $\sqrt{s}=1.8$ TeV have been studied using data with an integrated luminosity 325 ${\mathrm{nb}}^{\ensuremath{-}1}$ collected the Collider Detector Fermilab during 1988-1989 run. The individual jet ${p}_{T}$ spectra and angles between each pair are compared to predictions leading-order quantum chromodynamics for double gluon bremsstrahlung process good agreement is observed. In addition, a search parton...
A benzophenone–diphenylamine co-crystal nucleates from a submerged eutectic—is this possible mechanism of grinding induced synthesis such materials?
A search for the top quark in p\ifmmode\bar\else\textasciimacron\fi{}p collisions at a center-of-mass energy of 1.8 TeV using Collider Detector Fermilab is described. study events selected by requiring an energetic electron, missing transverse energy, and two or more jets excludes 95% confidence level standard-model production decay tt\ifmmode\bar\else\textasciimacron\fi{} pairs if top-quark mass between 40 77 GeV/${c}^{2}$. The observed electron + multijet data are consistent with W-boson...
We have analyzed events with jets and large missing transverse energy produced in p¯p colisions at √s =1.8 TeV. The observed event rate is consistent standard model predictions. In a version of the supersymmetry (SUSY) light photino (mγ̃<15 GeV/c2) no cascade decays, we exclude 90% confidence level existence squarks gluinos masses less than 126 141 GeV/c2, respectively. mass limits are lower other choices SUSY parameters. An example presented.Received 17 August...
Antiproton-proton elastic scattering was measured at c.m.s. energies √s =546 and 1800 GeV in the range of four-momentum transfer squared 0.025<-t<0.29 GeV2. The data are well described by exponential form ebt with a slope b=15.28±0.58 (16.98±0.25) GeV−2 (1800) GeV. cross sections are, respectively, σel=12.87±0.30 19.70±0.85 mb.Received 5 August 1993DOI:https://doi.org/10.1103/PhysRevD.50.5518©1994 American Physical Society
We present results from searches for the top quark pp\ifmmode\bar\else\textasciimacron\fi{} collisions at Fermilab Tevatron Collider. The data sample was collected during 1988--89 with Collider Detector and has an integrated luminosity of 4.1 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$. Our previous search e\ensuremath{\mu} final states tt\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}e\ensuremath{\nu}b \ensuremath{\mu}\ensuremath{\nu}b\ifmmode\bar\else\textasciimacron\fi{}...
We have determined mW=79.91±0.39 GeV/c2 from an analysis of W→eν and W→μν data the Collider Detector at Fermilab in p¯p collisions a c.m. energy √s =1.8 TeV. This result, together with world-average Z mass, determines weak mixing angle to be sin2θW=0.232±0.008. Bounds on top-quark mass are discussed.Received 13 August 1990DOI:https://doi.org/10.1103/PhysRevLett.65.2243©1990 American Physical Society
A fourth state in the upsilon energy region has been seen ${e}^{+}{e}^{\ensuremath{-}}$ collisions at Cornell Electron Storage Ring. resonance is observed with a mass 1112\ifmmode\pm\else\textpm\fi{}5 MeV above lowest state. The 9.6-MeV rms width greater than 4.6-MeV resolution of beams. characteristics new make it likely candidate for $4^{3}S$ $b\overline{b}$ system, lying threshold production $B$ mesons.
We have used the momentum spectrum of leptons produced in semileptonic $B$-meson decays to set a 90%-confidence-level upper limit on $\frac{\ensuremath{\Gamma}(b\ensuremath{\rightarrow}\mathrm{ul}\ensuremath{\nu})}{\ensuremath{\Gamma}(b\ensuremath{\rightarrow}\mathrm{cl}\ensuremath{\nu})}$ 4%. also measure branching fractions $B$ meson be (12.0\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.5)% for electrons and (10.8\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}1.0)% muons.
Three narrow resonances have been observed in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation into hadrons at total energies between 9.4 and 10.4 GeV. Measurements of mass spacing ratios lepton pair widths support the interpretation these "$\ensuremath{\Upsilon}$" states as lowest triplet-$S$ levels $b\overline{b}$ quark-antiquark system.
An analysis of pp\ifmmode\bar\else\textasciimacron\fi{} collision events at \ensuremath{\surd}s =1.8 TeV with jets and large missing transverse energy finds no event >40 GeV. This result yields a 90%-C.L. limit on the cross section for one-jet-event production <0.1 nb jet in pseudorapidity range \ensuremath{\Vert}\ensuremath{\eta}\ensuremath{\Vert}<1.0 ${E}_{T}$>52 Limits masses squarks gluinos minimal supersymmetry model are also set. At 90% C.L., ${m}_{q\ifmmode \tilde{}\else...
Measurements of the ${e}^{+}{e}^{\ensuremath{-}}$ cross section above $B\overline{B}$ threshold are reported. Structures observed which could be $\ensuremath{\Upsilon}(5S)$ and $\ensuremath{\Upsilon}(6S)$ resonances. The masses widths given compared with various potential-model predictions. Average charged multiplicities inclusive lepton yields also presented.
$B$-meson decays to final states consisting of a ${D}^{0}$ or ${D}^{*\ifmmode\pm\else\textpm\fi{}}$ and one two charged pions have been observed. The charged-$B$ mass is 5270.8 \ifmmode\pm\else\textpm\fi{} 2.3 2.0 MeV the neutral-$B$ 5274.2 1.9 MeV.
We report a measurement of the diffraction dissociation differential cross section ${\mathit{d}}^{2}$${\mathrm{\ensuremath{\sigma}}}_{\mathrm{SD}}$/${\mathit{dM}}^{2}$dt for p\ifmmode\bar\else\textasciimacron\fi{}p\ensuremath{\rightarrow}p\ifmmode\bar\else\textasciimacron\fi{}X at \ensuremath{\surd}s =546 and 1800 GeV, ${\mathit{M}}^{2}$/s0.2 0\ensuremath{\le}-t\ensuremath{\le}0.4 ${\mathrm{GeV}}^{2}$. Our results are compared to theoretical predictions extrapolations from experimental lower...
A search for tt\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}e\ensuremath{\mu}+X in pp\ifmmode\bar\else\textasciimacron\fi{} collisions at s\ensuremath{\surd}\ifmmode\bar\else\textasciimacron\fi{} TeV is described. The production and decay of top-quark--antiquark pairs considered the context standard model. analysis based on data with an integrated luminosity 4.4 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ recorded Collider Detector Fermilab. An upper limit...
An enhancement has been observed in the inclusive cross section for direct single electrons produced ${e}^{+}{e}^{\ensuremath{-}}$ annihilations at $\ensuremath{\Upsilon}(4S)$. This is interpreted as evidence a new weakly decaying particle, $B$ meson. A branching ratio $B\ensuremath{\rightarrow}\mathrm{Xe}\ensuremath{\nu}$ of [13\ifmmode\pm\else\textpm\fi{}3 (\ifmmode\pm\else\textpm\fi{}3)]% inferred, where first set errors statistical and estimated systematic error enclosed parentheses.
We have determined mW=79.91±0.39 GeV/c2 from an analysis of W→eν and W→μν data the Collider Detector at Fermilab in ¯pp collisions √s=1.8 TeV. From this result world-average Z mass, weak mixing angle is to be sin2θW=0.232±0.008. An upper bound on top-quark mass derived discussed.Received 13 August 1990DOI:https://doi.org/10.1103/PhysRevD.43.2070©1991 American Physical Society