Now showing items 260-279 of 438

  • Observation of a narrow mass state decaying into Υ(1S)+γ in pp¯ collisions at s√=1.96  TeV 

    D0 Collaboration; Chandra, A.; Corcoran, M.; Orduna, J.; Prewitt, M. (2012)
    Using data corresponding to an integrated luminosity of 1.3  fb−1, we observe a narrow mass state decaying into Υ(1S)+γ, where the Υ(1S) meson is detected by its decay into a pair of oppositely charged muons, and the photon ...
  • Observation of a peaking structure in the J/ψϕ mass spectrum from B±→ J/ψϕK± decays 

    CMS Collaboration; Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2014)
    A peaking structure in the J/ψϕ mass spectrum near threshold is observed in B±→J/ψϕK± decays, produced in pp collisions at √s=7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the ...
  • Observation of antiferromagnetic correlations in the Hubbard model with ultracold atoms 

    Hart, Russell A.; Duarte, Pedro M.; Yang, Tsung-Lin; Liu, Xinxing; Paiva, Thereza; Khatami, Ehsan; Scalettar, Richard T.; Trivedi, Nandini; Huse, David A.; Hulet, Randall G. (2015)
    Ultracold atoms in optical lattices have great potential to contribute to a better understanding of some of the most important issues in many-body physics, such as high-temperature superconductivity [1]. The Hubbard modelラa ...
  • Observation of D0 Meson Nuclear Modifications in Au+Au Collisions at √sNN=200  GeV 

    STAR Collaboration; Butterworth, J.; Eppley, G.; Geurts, F.; Llope, W.J.; Roberts, J.B.; Xin, K.; Yepes, P. (2014)
    We report the first measurement of charmed-hadron (D0) production via the hadronic decay channel (D0→K−+π+) in Au+Au collisions at √sNN=200  GeV with the STAR experiment. The charm production cross section per nucleon-nucleon ...
  • Observation of Edge Transport in the Disordered Regime of Topologically Insulating InAs/GaSb Quantum Wells 

    Knez, Ivan; Rettner, Charles T.; Yang, See-Hun; Parkin, Stuart S.P.; Du, Lingjie; Du, Rui-Rui; Sullivan, Gerard (2014-01)
    We observe edge transport in the topologically insulating InAs=GaSb system in the disordered regime. Using asymmetric current paths we show that conduction occurs exclusively along the device edge, exhibiting a large Hall ...
  • Observation of Forbidden Exciton Transitions Mediated by Coulomb Interactions in Photoexcited Semiconductor Quantum Wells 

    Rice, W.D.; Kono, J.; Zybell, S.; Winnerl, S.; Bhattacharyya, J.; Schneider, H.; Helm, M.; Ewers, B.; Chernikov, A.; Koch, M.; Chatterjee, S.; Khitrova, G.; Gibbs, H.M.; Schneebeli, L.; Breddermann, B.; Kira, M.; Koch, S.W. (2013)
    We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum well sample. Monitoring the excitonic photoluminescence, ...
  • Observation of Quantum Jumps in a Single Atom 

    Bergquist, J.C.; Hulet, Randall G.; Itano, Wayne M.; Wineland, D.J. (1986)
    We detect the radiatively driven electric quadrupole transition to the metastable D522 state in a single, laser-cooled Hg II ion by monitoring the abrupt cessation of the fluorescence signal from the laser-excited S122→P122 ...
  • Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at √s=8 TeV 

    CMS Collaboration; Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Michlin, B.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2014)
    The first observation of the associated production of a single top quark and a W boson is presented. The analysis is based on a data set corresponding to an integrated luminosity of 12.2  fb−1 of proton-proton collisions ...
  • Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at √s=8  TeV 

    CMS Collaboration; Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Michlin, B.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2014)
    The first observation of the associated production of a single top quark and a W boson is presented. The analysis is based on a data set corresponding to an integrated luminosity of 12.2  fb−1 of proton-proton collisions ...
  • Observation of the diphoton decay of the Higgs boson and measurement of its properties 

    CMS Collaboration; Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Michlin, B.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2014)
    Observation of the diphoton decay mode of the recently discovered Higgs boson and measurement of some of its properties are reported. The analysis uses the entire dataset collected by the CMS experiment in proton-proton ...
  • Observation of velocity-tuned multiphoton "Doppleron" resonances in laser-cooled atoms 

    Tollett, J.J.; Chen, J.; Story, J.G.; Ritchie, N.W.M.; Bradley, C.C.; Hulet, Randall G. (1990)
    An atomic beam of Li was transversely cooled using an intense standing-wave radiation field. A dramatic change in the transverse velocity distribution was observed. Structure in the resulting velocity distribution was found ...
  • Observational Tests of Magnetospheric Accretion Models in Young Stars 

    Johns-Krull, Christopher M.; Cauley, P. Wilson (2014)
    Magnetically controlled accretion of disk material onto the surface of Classical T Tauri stars is the dominant paradigm in our understanding of how these young stars interact with their surrounding disks. These stars provide ...
  • OBSERVATIONS OF PLASMA UPFLOW IN A WARM LOOP WITH HINODE/EIS 

    Tripathi, Durgesh; Mason, Helen E.; Del Zanna, Giulio; Bradshaw, Steven (2012)
    A complete understanding of Doppler shift in active region loops can help probe the basic physical mechanism involved into the heating of those loops. Here, we present observations of upflows in coronal loops detected ...
  • ON THE STRUCTURE AND STABILITY OF MAGNETIC TOWER JETS 

    Huarte-Espinosa, M.; Blackman, E.G.; Ciardi, A.; Hartigan, P.; Lebedev, S.V.; Chittenden, J.P. (2012)
    Modern theoretical models of astrophysical jets combine accretion, rotation, and magnetic fields to launch and collimate supersonic flows from a central source. Near the source, magnetic field strengths must be large ...
  • Optical detection of a Bardeen-Cooper-Schrieffer phase transition in a trapped gas of fermionic atoms 

    Zhang, Weiping; Sackett, C.A.; Hulet, R.G. (1999)
    A theoretical treatment of light scattering from a degenerate Fermi gas of trapped ultracold 6Li atoms is presented. We find that the scattered light contains information that directly reflects the quantum pair correlation ...
  • Optical Probes of Ultracold Neutral Plasmas 

    Laha, S.; Gao, H.; Castro, J.; Gupta, P.; Simien, C.E.; Killian, T.C. (2007)
  • Optical Properties of Star-Shaped Gold Nanoparticles 

    Nehl, Colleen L.; Liao, Hongwei; Hafner, Jason H. (2006-03-28)
  • Optimization of evaporative cooling 

    Sackett, C.A.; Bradley, C.C.; Hulet, R.G. (1997)
    Recent experiments have used forced evaporative cooling to produce Bose-Einstein condensation in dilute gases. The evaporative cooling process can be optimized to provide the maximum phase-space density with a specified ...
  • Origin and Structure of the Quasi-Landau Resonances 

    Castro, Jarbas C.; Zimmerman, Myron L.; Hulet, Randall G.; Kleppner, Daniel; Freeman, Richard R. (1980)
    Highly resolved spectra are presented which show how the low-magnetic-field energy-level structure of a single-electron atom gives rise to the quasi-Landau resonances as the field is increased. Data from the strong-mixing ...
  • The Origin of Minus-end Directionality and Mechanochemistry of Ncd Motors 

    Jana, Biman; Hyeon, Changbong; Onuchic, José N. (2012-11-15)
    Adaptation of molecular structure to the ligand chemistry and interaction with the cytoskeletal filament are key to understanding the mechanochemistry of molecular motors. Despite the striking structural similarity with ...