M. Demarteau
A5082918007- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Photocathodes and Microchannel Plates
- Nuclear Physics and Applications
- Medical Imaging Techniques and Applications
- CCD and CMOS Imaging Sensors
- Distributed and Parallel Computing Systems
- Photonic and Optical Devices
- Advanced Optical Sensing Technologies
- Superconducting Materials and Applications
- International Science and Diplomacy
- Electron and X-Ray Spectroscopy Techniques
- 3D IC and TSV technologies
- Nuclear physics research studies
Oak Ridge National Laboratory
2019-2024
Thomas Jefferson National Accelerator Facility
2023-2024
University of California, Riverside
2024
Weizmann Institute of Science
2022-2023
Duquesne University
2022-2023
Brookhaven National Laboratory
1984-2023
Argonne National Laboratory
2011-2019
Fermi National Accelerator Laboratory
2003-2012
University of Buenos Aires
1997-2011
Institute of High Energy Physics
2010-2011
The D0 Collaboration reports on a search for the standard model top quark in pp¯ collisions at s=1.8TeV Fermilab Tevatron with an integrated luminosity of approximately 50pb−1. We have searched tt¯ production dilepton and single-lepton decay channels without tagging b-quark jets. observed 17 events expected background 3.8±0.6 events. probability upward fluctuation to produce signal is 2×10−6 (equivalent 4.6 deviations). kinematic properties excess are consistent decay. conclude that we...
In this article, we experimentally demonstrate that the transport gap of phosphorene can be tuned monotonically from ∼0.3 to ∼1.0 eV when flake thickness is scaled down bulk a single layer. As consequence, ON current, OFF and current ON/OFF ratios field effect transistors (FETs) were found significantly impacted by layer thickness. The was determined transfer characteristics FETs using robust technique has not been reported before. detailed mathematical model also provided. By scaling gate...
We present the science case, reference design, and project plan for Stage-4 ground-based cosmic microwave background experiment CMB-S4.
In this article, we demonstrate enhanced electron and hole transport in few-layer phosphorene field effect transistors (FETs) using titanium as the source/drain contact electrode 20 nm SiO2 back gate dielectric. The mobility values were extracted to be ∼38 cm2/Vs for electrons ∼172 holes. On basis of our experimental data, also comprehensively discuss how resistances arising due Schottky barriers at source drain end different regime device characteristics ultimately limit ON state...
We present a measurement of forward-backward asymmetry in top quark-antiquark production proton-antiproton collisions the final state containing lepton and at least four jets. Using dataset corresponding to an integrated luminosity $5.4\,\mathrm {fb}^{-1}$, collected by \DZ\ experiment Fermilab Tevatron Collider, we measure \ttbar\ be $(9.2 \pm 3.7)$% reconstruction level. When corrected for detector acceptance resolution, is found $(19.6 6.5)$%. also based on from quark decay, $(15.2...
This White Paper presents an overview of the current status and future perspective QCD research, based on community inputs scientific conclusions from 2022 Hot Cold Town Meeting. We present progress made in last decade toward a deep understanding both fundamental structure sub-atomic matter nucleon nucleus cold QCD, hot heavy ion collisions. identify key questions research plausible paths to obtaining answers those near future, hence defining priorities our over coming decades.
The Proceedings of the 2011 workshop on Fundamental Physics at Intensity Frontier. Science opportunities intensity frontier are identified and described in areas heavy quarks, charged leptons, neutrinos, proton decay, new light weakly-coupled particles, nucleons, nuclei, atoms.
We present an updated measurement of the anomalous like-sign dimuon charge asymmetry Aslb for semi-leptonic $b$-hadron decays in 9.0 fb^-1 p pbar collisions recorded with D0 detector at a center-of-mass energy sqrt{s} = 1.96 TeV Fermilab Tevatron collider. obtain (-0.787 +- 0.172(stat) 0.093 (syst))%. This result differs by 3.9 standard deviations from prediction model and provides evidence anomalously large CP violation neutral B decay. The dependence on muon impact parameter is consistent...
We report an updated measurement of the $CP$-violating phase, ${\ensuremath{\phi}}_{s}^{J/\ensuremath{\psi}\ensuremath{\phi}}$, and decay-width difference for two mass eigenstates, $\ensuremath{\Delta}{\ensuremath{\Gamma}}_{s}$, from flavor-tagged decay ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$. The data sample corresponds to integrated luminosity $8.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ accumulated with D0 detector using $p\overline{p}$ collisions...
The Compact Linear Collider (CLIC) is an option for a future $${\mathrm{e}^{+}}{\mathrm{e}^{-}} $$ collider operating at centre-of-mass energies up to $$3\,\text {TeV} , providing sensitivity wide range of new physics phenomena and precision measurements the energy frontier. This paper first comprehensive presentation Higgs reach CLIC three stages: $$\sqrt{s} = 350\,\text {GeV} 1.4 . initial stage operation allows study boson production in Higgsstrahlung ( \rightarrow {\mathrm{Z}}...
Abstract We summarise the discussions at a virtual Community Workshop on Cold Atoms in Space concerning status of cold atom technologies, prospective scientific and societal opportunities offered by their deployment space, developments needed before atoms could be operated space. The technologies discussed include atomic clocks, quantum gravimeters accelerometers, interferometers. Prospective applications metrology, geodesy measurement terrestrial mass change due to, e.g., climate change,...
We summarize the recent progress of Axion Longitudinal Plasma Haloscope (ALPHA) Consortium, a new experimental collaboration to build plasma haloscope search for axions and dark photons. The is novel method detection resonant conversion light matter ALPHA will be sensitive QCD over almost decade parameter space, potentially discovering resolving strong $CP$ problem. Unlike traditional cavity haloscopes, which are generally limited in volume by Compton wavelength matter, haloscopes use wire...
The D0 Collaboration has performed a measurement of the top quark mass mt based on six candidate events for process tt¯→bW+b¯W−, where W bosons decay to eν or μν. This sample was collected during an exposure detector integrated luminosity 125pb−1 s=1.8TeVpp¯ collisions. We obtain mt=168.4±12.3(stat)±3.6(syst)GeV/c2, consistent with obtained using single-lepton events. Combination and dilepton results yields mt=172.0±7.5GeV/c2.Received 16 June...
We present a search for events consistent with the production and decay of squarks gluinos minimal supersymmetric standard model (MSSM) in D0 detector at Fermilab Tevatron $p\overline{p}$ collider. examined data containing large missing transverse energy three or more jets. observed no excess above expected yield from processes. For choice MSSM parameter values, we set lower limit 95% confidence level on mass gluino 144 GeV ${/c}^{2}$ all squark masses 212 equal masses.
We report on the demonstration of a p-type, single crystalline, few layer MoS2 field effect transistor (FET) using Niobium (Nb) as dopant. The doping concentration was extracted and determined to be ∼3 × 1019/cm3. also bilayer Nb-doped FETs with ambipolar conduction. found that current ON-OFF ratio changes significantly function flake thickness. attribute this experimental observation bulk-type electrostatic in ultra-thin crystals. provide detailed analytical modeling support our claims....
This paper summarizes the physics potential of CLIC high-energy e+e- linear collider. It provides input to Snowmass 2013 process for energy-frontier working groups on The Higgs Boson (HE1), Precision Study Electroweak Interactions (HE2), Fully Understanding Top Quark (HE3), as well Path Beyond Standard Model -- New Particles, Forces, and Dimensions (HE4). is accompanied by a describing accelerator study, submitted Frontier Capabilities group process.
A bstract The Compact Linear Collider (CLIC) is a proposed future high-luminosity linear electron-positron collider operating at three energy stages, with nominal centre-of-mass energies $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 380 GeV, 1 . 5 TeV, and 3 TeV. Its aim to explore the frontier, providing sensitivity physics beyond Standard Model (BSM) precision measurements of processes an emphasis on Higgs...
Inflation may provide unique insight into the physics at highest available energy scales that cannot be replicated in any realistic terrestrial experiment. Features primordial power spectrum are generically predicted a wide class of models inflation and its alternatives, observationally one most overlooked channels for finding evidence non-minimal inflationary models. Constraints from observations cosmic microwave background cover widest range feature frequencies, but sensitive constraints...
We determine the top quark mass m_t using t-tbar pairs produced in D0 detector by \sqrt{s} = 1.8 TeV p-pbar collisions a 125 pb^-1 exposure at Fermilab Tevatron. make two constraint fit to -> b W^+bbar W^- final states with one W boson decaying q-qbar and other e-nu or mu-nu. Likelihood fits data yield m_t(l+jets) 173.3 +- 5.6 (stat) 5.5 (syst) GeV/c^2. When this result is combined an analysis of events which both bosons decay into leptons, we obtain 172.1 5.2 4.9 An alternate analysis,...
We present new results on the search for top quark in p¯p collisions at √s=1.8 TeV with an integrated luminosity of 13.5±1.6 pb–1. have considered t¯t production standard model using electron and muon dilepton decay channels ( t¯t→eμ+ jets, ee+ μμ+ jets) single-lepton t¯t→e+ jets μ+ without tagging b jets. From all we nine events expected background 3.8±0.9. If assume that excess is due to production, a mass 180 GeV/ c2, obtain cross section 8.2±5.1 pb.Received 7 November...
We have searched for evidence of top quark production in pp¯ collisions at √s =1.8 TeV using the D0 detector Fermilab Tevatron collider. For an integrated luminosity 15 pb−1, we report results a search tt¯ pairs decay modes tt¯→eμ+jets,ee+jets,e+jets, and μ+jets. From analyses these obtain lower limit on mass 131 GeV/c2 95% confidence level, assuming standard model branching fractions predicted cross section production. discuss properties event which expected backgrounds are small.Received 4...