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Träfflista för sökning "WFRF:(Suter Thomas M.) srt2:(2010-2014)"

Search: WFRF:(Suter Thomas M.) > (2010-2014)

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1.
  • Schael, S., et al. (author)
  • Electroweak measurements in electron positron collisions at W-boson-pair energies at LEP
  • 2013
  • In: Physics Reports. - : Elsevier BV. - 0370-1573 .- 1873-6270. ; 532:4, s. 119-244
  • Research review (peer-reviewed)abstract
    • Electroweak measurements performed with data taken at the electron positron collider LEP at CERN from 1995 to 2000 are reported. The combined data set considered in this report corresponds to a total luminosity of about 3 fb(-1) collected by the four LEP experiments ALEPH, DELPHI, 13 and OPAL, at centre-of-mass energies ranging from 130 GeV to 209 GeV. Combining the published results of the four LEP experiments, the measurements include total and differential cross-sections in photon-pair, fermion-pair and four-fermion production, the latter resulting from both double-resonant WW and ZZ production as well as singly resonant production. Total and differential cross-sections are measured precisely, providing a stringent test of the Standard Model at centre-of-mass energies never explored before in electron positron collisions. Final-state interaction effects in four-fermion production, such as those arising from colour reconnection and Bose Einstein correlations between the two W decay systems arising in WW production, are searched for and upper limits on the strength of possible effects are obtained. The data are used to determine fundamental properties of the W boson and the electroweak theory. Among others, the mass and width of the W boson, m(w) and Gamma(w), the branching fraction of W decays to hadrons, B(W -> had), and the trilinear gauge-boson self-couplings g(1)(Z), K-gamma and lambda(gamma), are determined to be: m(w) = 80.376 +/- 0.033 GeV Gamma(w) = 2.195 +/- 0.083 GeV B(W -> had) = 67.41 +/- 0.27% g(1)(Z) = 0.984(-0.020)(+0.018) K-gamma - 0.982 +/- 0.042 lambda(gamma) = 0.022 +/- 0.019. (C) 2013 Elsevier B.V. All rights reserved.
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2.
  • Morenzoni, Elvezio, et al. (author)
  • Low-Energy Muons at PSI: Examples of Investigations of Superconducting Properties in Near-Surface Regions and Heterostuctures
  • 2014
  • In: Proceedings of the International Symposium on Science Explored by Ultra Slow Muon (USM2013). - : The Physical Society of Japan.
  • Conference paper (peer-reviewed)abstract
    • With the advent of polarized low-energy muons, with tunable energy in the kiloelectronvolt range, it is possible to use the sensitivity and the local-probe character of µSR to perform depth-dependent investigations on the nanometer scale of magnetic and superconducting properties of materials. Here, after a brief summary of the present status of LE-µSR at PSI, we give some examples of investigations of superconducting properties in the near-surface regions of single crystals and thin-film materials.
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3.
  • Suter, Andreas, et al. (author)
  • Two-Dimensional Magnetic and Superconducting Phases in Metal-Insulator La2−xSrxCuO4 Superlattices Studied by Low-Energy Muon-Spin Rotation
  • 2014
  • In: Proceedings of the International Symposium on Science Explored by Ultra Slow Muon (USM2013). - : Physical society of Japan. ; , s. 010204-010204
  • Conference paper (peer-reviewed)abstract
    • We show, by means of low-energy muon-spin-rotation measurements, that few-unit-cells thick La2CuO4 layers synthesized digitally by molecular beam epitaxy are antiferromagnetically ordered. Below a thickness of about 5 CuO2 layers the long-range ordered state breaks down, and a magnetic state appears with enhanced quantum fluctuations and a reduced spin stiffness. This magnetic state can exist in close proximity (few Å) to high-temperature superconducting layers, without transmitting supercurrents. Charge-transfer effects and potential softening of the antiferromagnetic state due to the proximity to the superconducting state are discussed.
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