Author
D. A. Whitehouse
Other affiliations: Boston University
Bio: D. A. Whitehouse is an academic researcher from Los Alamos National Laboratory. The author has contributed to research in topics: Pion & Neutrino oscillation. The author has an hindex of 10, co-authored 24 publications receiving 745 citations. Previous affiliations of D. A. Whitehouse include Boston University.
Papers
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TL;DR: In this article, the authors used the Liquid Scintillator Neutrino Detector (LSND) located 30 m behind the Los Alamos Meson Physics Facility beam stop.
Abstract: A search for ${\overline{\ensuremath{
u}}}_{e}$'s in excess of the number expected from conventional sources has been made using the Liquid Scintillator Neutrino Detector, located 30 m behind the Los Alamos Meson Physics Facility beam stop. The ${\overline{\ensuremath{
u}}}_{e}$ are detected via ${\overline{\ensuremath{
u}}}_{e}p\ensuremath{\rightarrow}{e}^{+}n$ with ${e}^{+}$ energy between 36 and $60\mathrm{MeV}$, followed by a $\ensuremath{\gamma}$ ray from $\mathrm{np}\ensuremath{\rightarrow}d\ensuremath{\gamma}$ ( $2.2\mathrm{MeV}$). Using strict cuts to identify $\ensuremath{\gamma}$ rays correlated with ${e}^{+}$ yields 9 events with only $2.1\ifmmode\pm\else\textpm\fi{}0.3$ background expected. A likelihood fit to the entire ${e}^{+}$ sample results in a total excess of ${16.4}_{\ensuremath{-}8.9}^{+9.7}\ifmmode\pm\else\textpm\fi{}3.3$ events. If attributed to ${\overline{\ensuremath{
u}}}_{\ensuremath{\mu}}\ensuremath{\rightarrow}{\overline{\ensuremath{
u}}}_{e}$ oscillations, this corresponds to an oscillation probability of ( ${0.34}_{\ensuremath{-}0.18}^{+0.20}\ifmmode\pm\else\textpm\fi{}0.07$)%.
378 citations
Temple University1, University of California, Santa Barbara2, Los Alamos National Laboratory3, Linfield College4, University of New Mexico5, Stanford University6, Louisiana State University7, Louisiana Tech University8, University of California, Riverside9, Embry–Riddle Aeronautical University10, University of California, San Diego11
21 Mar 1997-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, the experimental setup, detector operation and neutrino source were discussed, including aspects relevant to oscillation searches in the muon decay-at-rest and pion decay in flight channels.
Abstract: A search for neutrino oscillations of the type ν μ → ν c has been conducted at the Los Alamos Meson Physics Facility using ν μ from muon decay at rest. Evidence for this transition has been reported previously. This paper discusses in detail the experimental setup, detector operation and neutrino source, including aspects relevant to oscillation searches in the muon decay-at-rest and pion decay in flight channels.
146 citations
31 citations
TL;DR: The photon spectrum from ${K}^{\mathrm{\ensuremath{-}}}$ stopping in liquid hydrogen has been measured with a high-resolution (1.5% FWHM at 300 MeV) NaI(Tl) detector and results are not in good agreement with published predictions or with previous \ensure Math{\Lambda}\ensureMath{\gamma} measurements.
Abstract: The photon spectrum from ${K}^{\mathrm{\ensuremath{-}}}$ stopping in liquid hydrogen has been measured with a high-resolution (1.5% FWHM at 300 MeV) NaI(Tl) detector. The branching ratios for ${K}^{\mathrm{\ensuremath{-}}}$p\ensuremath{\rightarrow}\ensuremath{\Lambda}\ensuremath{\gamma} (${E}_{\ensuremath{\gamma}}$=281.4 MeV) and ${K}^{\mathrm{\ensuremath{-}}}$p\ensuremath{\rightarrow}${\ensuremath{\Sigma}}^{0}$\ensuremath{\gamma} (${E}_{\ensuremath{\gamma}}$=219.5 MEV) were obtained. The results are ${\mathit{R}}_{\mathrm{\ensuremath{\Lambda}}\ensuremath{\gamma}}$=(0.86\ifmmode\pm\else\textpm\fi{}0.${07}_{\mathrm{\ensuremath{-}}0.08}^{+0.1}$)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$ and ${\mathit{R}}_{\mathrm{\ensuremath{\Sigma}}0\ensuremath{\gamma}}$=(1.44\ifmmode\pm\else\textpm\fi{}0.${20}_{\mathrm{\ensuremath{-}}0.10}^{\ifmmode\pm\else\textpm\fi{}0.12}$)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$ where the first error is statistical and the second systematic. These results are not in good agreement with published predictions or with previous \ensuremath{\Lambda}\ensuremath{\gamma} measurements.
29 citations
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TL;DR: This biennial Review summarizes much of particle physics, using data from previous editions.
12,798 citations
TL;DR: In this article, the authors give simple mass-matrices leading to tri-bimaximal mixing, and discuss its relation to the Fritzsch-Xing democratic ansatz.
1,347 citations
1,177 citations
Perimeter Institute for Theoretical Physics1, Niigata University2, CERN3, University of Connecticut4, Leiden University5, Korea Astronomy and Space Science Institute6, Federico Santa María Technical University7, University of California, Santa Barbara8, University of Maryland, College Park9, Claude Bernard University Lyon 110, University of Lyon11, Northwestern University12, University of Victoria13, University of Manchester14, University of Bonn15, Technische Universität München16, École Polytechnique Fédérale de Lausanne17, Stony Brook University18, Autonomous University of Madrid19, University of Paris20, Centre national de la recherche scientifique21, Moscow Institute of Physics and Technology22, Autonomous University of Barcelona23, University of Copenhagen24, Université libre de Bruxelles25, University of La Serena26, University of Valencia27, Taras Shevchenko National University of Kyiv28, Heidelberg University29, Yonsei University30, Princeton University31, Harvard University32, University of Geneva33, Tomsk Polytechnic University34, University of Tübingen35, Tomsk State University36, University of Washington37, University of Florida38, University of Hamburg39, TRIUMF40, University of Iowa41, University of Grenoble42, International Centre for Theoretical Physics43, Hokkai Gakuen University44, University of Illinois at Urbana–Champaign45, Durham University46, University of Melbourne47, University of Naples Federico II48, York University49, University of California, Berkeley50, Lawrence Berkeley National Laboratory51
TL;DR: It is demonstrated that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.
Abstract: This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (search for hidden particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below the Fermi scale, inaccessible to the LHC experiments, and to study tau neutrino physics. The same proton beam setup can be used later to look for decays of tau-leptons with lepton flavour number non-conservation, $\tau \to 3\mu $ and to search for weakly-interacting sub-GeV dark matter candidates. We discuss the evidence for physics beyond the standard model and describe interactions between new particles and four different portals—scalars, vectors, fermions or axion-like particles. We discuss motivations for different models, manifesting themselves via these interactions, and how they can be probed with the SHiP experiment and present several case studies. The prospects to search for relatively light SUSY and composite particles at SHiP are also discussed. We demonstrate that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.
842 citations
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11 Dec 2011-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The T2K experiment as discussed by the authors is a long-baseline neutrino oscillation experiment whose main goal is to measure the last unknown lepton sector mixing angle by observing its appearance in a particle beam generated by the J-PARC accelerator.
Abstract: The T2K experiment is a long-baseline neutrino oscillation experiment Its main goal is to measure the last unknown lepton sector mixing angle {\theta}_{13} by observing {
u}_e appearance in a {
u}_{\mu} beam It also aims to make a precision measurement of the known oscillation parameters, {\Delta}m^{2}_{23} and sin^{2} 2{\theta}_{23}, via {
u}_{\mu} disappearance studies Other goals of the experiment include various neutrino cross section measurements and sterile neutrino searches The experiment uses an intense proton beam generated by the J-PARC accelerator in Tokai, Japan, and is composed of a neutrino beamline, a near detector complex (ND280), and a far detector (Super-Kamiokande) located 295 km away from J-PARC This paper provides a comprehensive review of the instrumentation aspect of the T2K experiment and a summary of the vital information for each subsystem
714 citations