G. S. Davies
A5080375420- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- CCD and CMOS Imaging Sensors
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Planetary Science and Exploration
- Nuclear Physics and Applications
- Distributed and Parallel Computing Systems
- Silicon and Solar Cell Technologies
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Pulsars and Gravitational Waves Research
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- Advanced Data Storage Technologies
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Advanced Electrical Measurement Techniques
University of Mississippi
2020-2025
Indiana University Bloomington
2015-2023
Supreme Council of Antiquities
2022
American Society of Overseas Research
2022
Institut Français d'Archéologie Orientale
2022
Czech Academy of Sciences, Oriental Institute
2022
Indiana University
2017-2018
Uppsala University
2018
Fermi National Accelerator Laboratory
2015-2017
University of Hyderabad
2017
The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario |Δm(23)(2)| = 2.4×10(-3) eV(2), sin(2)2θ(23) 1 and sin(2)2θ(13) 0, expected number such is 1.5±0.3(syst). Under this hypothesis, probability to observe six or more candidate 7×10(-3), equivalent 2.5σ significance. At 90% C.L., are consistent 0.03(0.04) < 0.28(0.34)...
The T2K experiment is a long baseline neutrino oscillation experiment. Its main goal to measure the last unknown lepton sector mixing angle θ13 by observing νe appearance in νμ beam. It also aims make precision measurement of known parameters, Δm232 and sin22θ23, via disappearance studies. Other goals include various cross-section measurements sterile searches. uses an intense proton beam generated J-PARC accelerator Tokai, Japan, composed beamline, near detector complex (ND280), far...
The NOvA experiment has made a $4.4\sigma$-significant observation of $\bar\nu_{e}$ appearance in 2 GeV $\bar\nu_{\mu}$ beam at distance 810 km. Using $12.33\times10^{20}$ protons on target delivered to the Fermilab NuMI neutrino beamline, recorded 27 $\bar\nu_{\mu} \rightarrow \bar\nu_{e}$ candidates with background 10.3 and 102 \bar\nu_{\mu}$ candidates. This new antineutrino data is combined measure oscillation parameters $|\Delta m^2_{32}| = 2.48^{+0.11}_{-0.06}\times10^{-3}$ eV$^2/c^4$,...
We report results from the first search for νμ→νe transitions by NOvA experiment. In an exposure equivalent to 2.74×1020 protons on target in upgraded NuMI beam at Fermilab, we observe 6 events Far Detector, compared a background expectation of 0.99±0.11(syst) based Near Detector measurement. A secondary analysis observes 11 with 1.07±0.14(syst). The 3.3σ excess observed primary disfavors 0.1π<δCP<0.5π inverted mass hierarchy 90% C.L.Received 19 January...
Hyper-Kamiokande will be a next-generation underground water Cherenkov detector with total (fiducial) mass of 0.99 (0.56) million metric tons, approximately 20 (25) times larger than that Super-Kamiokande. One the main goals is study |$CP$| asymmetry in lepton sector using accelerator neutrino and anti-neutrino beams. In this paper, physics potential long-baseline experiment beam from J-PARC proton synchrotron presented. The analysis uses framework systematic uncertainties derived ongoing...
We present updated results from the NOvA experiment for $\nu_\mu\rightarrow\nu_\mu$ and $\nu_\mu\rightarrow\nu_e$ oscillations an exposure of $8.85\times10^{20}$ protons on target, which represents increase 46% compared to our previous publication. The utilize significant improvements in both simulations analysis data. A joint fit data $\nu_\mu$ disappearance $\nu_e$ appearance gives best point as normal mass hierarchy, $\Delta m^2_{32} = 2.44\times 10^{-3}{{\rm eV}^2}/c^4$,...
We present new $ν_μ\rightarrowν_e$, $ν_μ\rightarrowν_μ$, $\overlineν_μ\rightarrow\overlineν_e$, and $\overlineν_μ\rightarrow\overlineν_μ$ oscillation measurements by the NOvA experiment, with a 50% increase in neutrino-mode beam exposure over previously reported results. The additional data, combined published neutrino antineutrino are all analyzed using improved techniques simulations. A joint fit to $ν_e$, $ν_μ$, $\overlineν_e$, $\overlineν_μ$ candidate samples within 3-flavor framework...
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.
Using a muon neutrino source at Fermilab, the NOvA collaboration has measured disappearance and electron appearance, strengthening constraints on $C\phantom{\rule{0}{0ex}}P$-violating phase in inverted-neutrino-mass-hierarchy case.
This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of $6.05\times10^{20}$ protons-on-target the NuMI beam at Fermi National Accelerator Laboratory. The measurement probes muon-tau symmetry hypothesis that requires maximal mixing ($\theta_{23} = \pi/4$). Assuming normal mass hierarchy, we find $\Delta m^2 (2.67 \pm 0.11)\times 10^{-3}$ eV$^2$ and $\sin^2 \theta_{23}$ two statistically degenerate values...
We report a measurement of muon-neutrino disappearance in the T2K experiment. The 295-km beam from Tokai to Kamioka is first implementation off-axis technique long-baseline neutrino oscillation With data corresponding $1.43\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target, we observe 31 fully-contained single $\ensuremath{\mu}$-like ring events Super-Kamiokande, compared with an expectation $104\ifmmode\pm\else\textpm\fi{}14\text{ }(\mathrm{syst})$ without oscillations. best-fit...
Hyper-Kamiokande will be a next generation underground water Cherenkov detector with total (fiducial) mass of 0.99 (0.56) million metric tons, approximately 20 (25) times larger than that Super-Kamiokande. One the main goals is study $CP$ asymmetry in lepton sector using accelerator neutrino and anti-neutrino beams. In this document, physics potential long baseline experiment beam from J-PARC proton synchrotron presented. The analysis has been updated previous Letter Intent [K. Abe et al.,...
In early 2010, the Long-Baseline Neutrino Experiment (LBNE) science collaboration initiated a study to investigate physics potential of experiment with broad set different beam, near- and far-detector configurations. Nine initial topics were identified as scientific areas that motivate construction long-baseline neutrino very large far detector. We summarize justification for each topic estimated performance detector reference report also on optimized beam parameters capability proposed Near...
We report results from the first search for sterile neutrinos mixing with active through a reduction in rate of neutral-current interactions over baseline 810\,km between NOvA detectors. Analyzing 14-kton detector equivalent exposure 6.05$\times$10$^{20}$ protons-on-target NuMI beam at Fermilab, we observe 95 candidates Far Detector compared $83.5 \pm 9.7 \mbox{(stat.)} 9.4 \mbox{(syst.)}$ events predicted assuming only occurs neutrino species. No evidence $\nu_{\mu} \rightarrow \nu_{s}$...
The preponderance of matter over antimatter in the early Universe, dynamics supernova bursts that produced heavy elements necessary for life and whether protons eventually decay --- these mysteries at forefront particle physics astrophysics are key to understanding evolution our its current state eventual fate. Long-Baseline Neutrino Experiment (LBNE) represents an extensively developed plan a world-class experiment dedicated addressing questions. LBNE is conceived around three central...
The T2K experiment studies oscillations of an off-axis muon neutrino beam between the J-PARC accelerator complex and Super-Kamiokande detector. Special emphasis is placed on measuring mixing angle theta_13 by observing electron appearance via sub-dominant to oscillation, searching for CP violation in lepton sector. includes a sophisticated, off-axis, near detector, ND280, situated 280 m downstream production target order measure properties understand better interactions at energy scale below...
Abstract The two-detector design of the NOvA neutrino oscillation experiment, in which two functionally identical detectors are exposed to an intense beam, aids canceling leading order effects cross-section uncertainties. However, limited knowledge interaction cross sections still gives rise some largest systematic uncertainties current measurements. We show contemporary models interactions be discrepant with data from NOvA, consistent discrepancies seen other experiments. Adjustments GENIE...
We report a search for neutrino oscillations to sterile neutrinos under model with three active and one (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>3</a:mn><a:mo>+</a:mo><a:mn>1</a:mn></a:mrow></a:math> model). This analysis uses the NOvA detectors exposed NuMI beam, running in mode. The data exposure, <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Abstract Measuring observables to constrain models using maximum-likelihood estimation is fundamental many physics experiments. Wilks' theorem provides a simple way construct confidence intervals on model parameters, but it only applies under certain conditions. These conditions, such as nested hypotheses and unbounded are often violated in neutrino oscillation measurements other experimental scenarios. Monte Carlo methods can address these issues, albeit at increased computational cost. In...
Double- and single-differential cross sections for inclusive charged-current <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>ν</a:mi><a:mi>μ</a:mi></a:msub></a:math>-nucleus scattering are reported the kinematic domain 0 to <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mn>2</c:mn><c:mtext> </c:mtext><c:mtext> </c:mtext><c:mi>GeV</c:mi><c:mo>/</c:mo><c:mi>c</c:mi></c:mrow></c:math> in three-momentum transfer 2 GeV...
This White Paper is an input to the ongoing discussion about extension and refinement of simplified Dark Matter (DM) models. Based on two concrete examples, we show how existing DM models (SDMM) can be extended provide a more accurate comprehensive framework interpret characterise collider searches. In first example extend canonical SDMM with scalar mediator include mixing Higgs boson. We that this approach not only provides better description underlying kinematic properties complete model...