Department of Physics
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Wave-optics modeling of the optical-transport line for passive optical stochastic cooling
(2017-12-20)Optical stochastic cooling (OSC) is expected to enable fast cooling of dense particle beams. Transition from microwave to optical frequencies enables an achievement of stochastic cooling rates which are orders of magnitude ... -
Amplifier for Optical Stochastic Cooling
(Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2017), paper JW2A.90 •https://doi.org/10.1364/CLEO_AT.2017.JW2A.90, 2017-05-20)The amplification of electromagnetic radiation emitted from charged-particlebeams can be used for beam cooling. We discuss our progress to develop such a system usingundulator radiation. -
Measurement of Ampère-class pulsed electron beams via field emission from carbon-nanotube cathodes in a radiofrequency gun
(AIP Publishing LLC, 2015-07-20)Pulsed field emission from cold carbon-nanotube cathodes placed in a radiofrequency resonant cavity was directly measured. The cathodes were located on the backplate of a conventional 1+1/2 -cell resonant cavity operating ... -
Positrons ride the wave
(Macmillan Publishers Limited, 2015-08-27)This is an invited News & View that comment on the paper published in the same issue of Nature and detailing a new regime for positrons acceleration in a plasma-wakefield accelerator. -
Tailored electron bunches with smooth current pro les for enhanced transformer ratios in beam-driven acceleration
(Phys. Rev. ST Accel. Beams 18, 081301, 2015-08-20)Collinear high-gradient ${\cal O} (GV/m)$ beam-driven wakefield methods for charged-particle acceleration could be critical to the realization of compact, cost-efficient, accelerators, e.g., in support of TeV-scale lepton ... -
Search for the Standard Model Higgs Boson in ZH -> l(+) l(-) b(b)over-bar Production with the D0 Detector in 9.7 fb(-1)of p(p)over-bar Collisions at root s=1.96 TeV
(American Physical Society, 2012-09)We present a search for the standard model (SM) Higgs boson produced in association with a Z boson in 9.7 fb(-1) of p (p) over bar collisions collected with the D0 detector at the Fermilab Tevatron Collider at root s = ... -
Search for Higgs Boson Production in Oppositely Charged Dilepton and Missing Energy Events in pp over-bar at root s=1.96 TeV
(American Physical Society, 2012)We present a search for the standard model Higgs boson using events with two oppositely charged leptons and large missing transverse energy as expected in H -> WW decays. The events are selected from data corresponding ... -
Thickness Induced Structural Changes in Polystyrene Films
(American Physical Society, 2008)Changes to the structure of polystyrene melt films as measured through the spectrum of density fluctuations have been observed as a function of film thickness down to the polymer radius of gyration (Rg). Films thicker ... -
Reduced Viscosity of the Free Surface in Entangled Polymer Melt Films
(American Physical Society, 2010)By embedding ‘‘dilute’’ gold nanoparticles in single polystyrene thin films as ‘‘markers’’, we probe the local viscosity of the free surface at temperatures far above the glass transition temperature (Tg). The technique ... -
Measurement of the Interior Structure of Thin Polymer Films Using Grazing Incidence Diffuse X-Ray Scattering
(American Physical Society, 2010)A method is developed for calculating the small-angle x-ray scattering originating from within the interior of a thin film under grazing incidence illumination. This offers the possibility of using x-ray scattering to ... -
Impact of an Irreversibly Adsorbed Layer on Local Viscosity of Nanoconfined Polymer Melts
(American Physical Society, 2011)We report the origin of the effect of nanoscale confinement on the local viscosity of entangled polystyrene (PS) films at temperatures far above the glass transition temperature. By using marker x-ray photon correlation ... -
Substrate Suppression of Thermal Roughness in Stacked Supported Bilayers
(American Physical Society, 2011)We have fabricated a stack of five 1,2-dipalmitoyl-sn-3-phosphatidylethanolamine (DPPE) bilayers supported on a polished silicon substrate in excess water. The density profile of these stacks normal to the substrate was ... -
Combination of the Top Quark Mass Measurements from the Tevatron Collider
(American Physical Society, 2012)The top quark is the heaviest known elementary particle, with a mass about 40 times larger than the mass of its isospin partner, the bottom quark. It decays almost 100% of the time to a W boson and a bottom quark. Using ... -
Measurement of the Differential Cross Section dσ/dt in Elastic pp- Scattering at √s = 1.96 TeV
(American Physical Society, 2012)We present a measurement of the elastic differential cross section dσ( pp-→ pp-)/dt as a function of the four-momentum-transfer squared t. The data sample corresponds to an integrated luminosity of ≈ 31 nb-1 collected ... -
Combination of CDF and D0 Measurements of the W boson Helicity in Top Quark Decays
(American Physical Society, 2012-04)We report the combination of recent measurements of the helicity of the W boson from top quark decay by the CDF and D0 collaborations, based on data samples corresponding to integrated luminosities of the 2.7-5.4 fb-1 of ... -
Measurement of the WZ and ZZ Production Cross Sections Using Leptonic Final States in 8.6 fb-1 of pp- Collisions
(American Physical Society, 2012-06)We study the processes pp- → WZ→ l± vl+ l- and pp-→ZZ →l+ l- vv-, where l = e or μ. Using 8.6 fb-1 of integrated luminosity collected by the D0 experiment at the Femilab Tevatron collider, we measure the WZ production ... -
Measurement of the Top-Quark Mass in pp- Collisions Using Events with Two Leptons
(American Physical Society, 2012-09)We present a measurement of the top-quark mass (mt) in pp- collisions at √s=1.96TeV using tt- events with two leptons (ee, e μ, or μμ) and accompanying jets in 4.3 fb-1 of data collected with the D0 detector at the ... -
Improved Determination of the Width of the Top Quark
(American Physical Society, 2012-05)We present an improved determination of the total width of the top quark, Γt, using 5.4 fb-1 of integrated luminosity collected by the D0 Collaboration at the Tevatron pp- Collider. The total width Γt is extracted from ... -
Search for Zγ Events with Large Missing Transverse Energy in pp- Collisions at √s=1.96TeV
(American Physical Society, 2012-10)We present the first search for new phenomena in Zγ final states with large missing transverse energy using data corresponding to an integrated luminosity of 6.2 fb-1 collected with the D0 experiment in pp- collisions ... -
Measurement of the Λ0b Lifetime in the Exclusive Decay Λ0b→J/ΨΛ0 in pp- Collisions at √s=1.96TeV
(American Physical Society, 2012-06)We measure the Λ0/b lifetime in the fully reconstructed decay Λ 0b→J/Ψ Λ0 using 10.4 fb-1 of pp- collisions collected with the D0 detector at √s=1.96TeV. The lifetime of the topologically similar decay channel B0→J/ΨK0S ...
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