T. C. Mclachlan
A5057728406- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Gyrotron and Vacuum Electronics Research
- Advanced Graph Neural Networks
- Atmospheric Ozone and Climate
- Advanced Data Storage Technologies
- Topic Modeling
- Wikis in Education and Collaboration
- Particle accelerators and beam dynamics
- Electron Spin Resonance Studies
- Superconducting Materials and Applications
- Advanced NMR Techniques and Applications
- Black Holes and Theoretical Physics
- Big Data Technologies and Applications
Deutsches Elektronen-Synchrotron DESY
2023-2025
Atlas Scientific (United States)
2024
A. Alikhanyan National Laboratory
2024
The University of Adelaide
2023
The University of Tokyo
2010-2022
Institute for Cosmic Ray Research
2010-2022
Kavli Institute for the Physics and Mathematics of the Universe
2016
Institute of Particle Physics
2013
University of Alberta
2013
University of California, Irvine
2013
The results of the third phase Super-Kamiokande solar neutrino measurement are presented and compared to first second results. With improved detector calibrations, a full simulation, analysis methods, systematic uncertainty on total flux is estimated be ?2.1%, which about two thirds for Super-Kamiokande. observed 8B in 5.0 20 MeV electron energy region 2.32+/-0.04 (stat.)+/-0.05 (sys.) *10^6 cm^-2sec^-1, agreement with previous measurements. A combined oscillation carried out using SK-I, II,...
We present a search for non-zero theta_{13} and deviations of sin^2 theta_{23} from 0.5 in the oscillations atmospheric neutrino data Super-Kamiokande -I, -II, -III. No distortions flux consistent with are found both mass hierarchy hypotheses agreement data. The best fit at Delta m^2 = 2.1 x 10^-3 eV^2, 0.0, =0.5. In normal (inverted) constrained one-dimensional 90% C.L. to < 0.04 (0.09) 1.9 (1.7) 2.6 (2.7) eV^2. mixing angle is within 0.407 <= 0.583
After important upgrades to the experiment, Super-Kamiokande collaboration returns measuring solar mixing angle and mass splitting $\mathrm{\ensuremath{\Delta}}\phantom{\rule{0}{0ex}}{m}_{12}^{2}$. By focusing on low-energy ${}^{8}B$ neutrinos, is able single out neutrinos that undergo flavor conversion only through vacuum oscillations. The results are currently most precise values for mass-difference parameters relevant neutrino
Super-Kamiokande (SK) can search for weakly interacting massive particles (WIMPs) by detecting neutrinos produced from WIMP annihilations occurring inside the Sun. In this analysis, we include neutrino events with interaction vertices in detector addition to upward-going muons surrounding rock. Compared previous result, which used only, signal acceptances light (few−GeV/c2−200−GeV/c2) WIMPs are significantly increased. We fit 3903 days of SK data contribution annihilation found no...
A new Super-Kamiokande (SK) search for Supernova Relic Neutrinos (SRNs) was conducted using 2853 live days of data. Sensitivity is now greatly improved compared to the 2003 SK result, which placed a flux limit near many theoretical predictions. This more detailed analysis includes variety improvements such as increased efficiency, lower energy threshold, and an expanded data set. New combined upper limits on SRN are between 2.8 3.0 nu_e cm^-2 s^-1 > 16 MeV total positron (17.3 E_nu).
Are there more than three types of neutrinos in nature ? Some experiments show that should exist at least one type, called sterile neutrinos. Using atmospheric neutrino data from the Super-Kamiokande experiment, authors find new limits on oscillations.
We present the result of an indirect search for high energy neutrinos from WIMP annihilation in Sun using upward-going muon (upmu) events at Super-Kamiokande. Datasets SKI-SKIII (3109.6 days) were used analysis. looked excess neutrino signal as compared with expected atmospheric background three upmu categories: stopping, non-showering, and showering. No significant was observed. The 90% C.L. upper limits flux induced by WIMPs 100 GeV/c$^2$ 6.4$\times10^{-15}$ cm$^{-2}$ sec$^{-1}$...
We have searched for proton decay via $p \rightarrow \nu K^{+}$ using Super-Kamiokande data from April 1996 to February 2013, 260 kiloton$\cdot$year exposure in total. No evidence this mode is found. A lower limit of the lifetime set $5.9 \times 10^{33}$ years at 90% confidence level.
We report an indication that the elastic scattering rate of solar $^8$B neutrinos with electrons in Super-Kamiokande detector is larger when pass through Earth during nighttime. determine day/night asymmetry, defined as difference average day and night divided by those two rates, to be $(-3.2\pm1.1(\text{stat})\pm0.5(\text{syst}))\%$, which deviates from zero 2.7 $\sigma$. Since process mostly sensitive electron-flavored neutrinos, a non-zero asymmetry implies flavor oscillations are...
Super-Kamiokande atmospheric neutrino data were fit with an unbinned maximum likelihood method to search for the appearance of tau leptons resulting from interactions oscillation-generated neutrinos in detector. Relative expectation unity, normalization is found be 1.42 ± 0.35(stat)(-0.12)(+0.14)(syst) excluding no-tau-appearance hypothesis, which would zero, at 3.8σ level. We estimate that 180.1 44.3(stat)(-15.2)(+17.8) (syst) produced 22.5 kton fiducial volume detector by during 2806 day...
We present a search for differences in the oscillations of antineutrinos and neutrinos Super-Kamiokande-I, -II, -III atmospheric neutrino sample. Under two-flavor disappearance model with separate mixing parameters between antineutrinos, we find no evidence difference oscillation parameters. Best-fit antineutrino is found to be at (Δm2,sin2 2θ)=(2.0×10(-3) eV2, 1.0) consistent overall Super-K measurement.
A search for neutrino oscillations induced by Lorentz violation has been performed using 4,438 live-days of Super-Kamiokande atmospheric data. The is included in addition to standard three-flavor the nonperturbative model extension (SME), allowing use full range path lengths, ranging from 15 12,800 km, and energies 100 MeV more than TeV search. No evidence was observed, so limits are set on renormalizable isotropic SME coefficients eμ, μτ, eτ sectors, improving existing up 7 orders magnitude...
We present the results of searches for nucleon decay via bound neutron to antineutrino plus pizero and proton piplus using data from a combined 172.8 kiloton-years exposure Super-Kamiokande-I, -II, -III. set lower limits on partial lifetime each these modes. For pizero, is >1.1x10^{33} years; piplus, >3.9x10^{32} years at 90% confidence level.
Super-Kamiokande (SK) can search for weakly interacting massive particles (WIMPs) by detecting neutrinos produced from WIMP annihilations occurring inside the Sun. In this analysis, we include neutrino events with interaction vertices in detector addition to upward-going muons surrounding rock. Compared previous result, which used only, signal acceptances light (few-GeV/$c^2$ $\sim$ 200-GeV/$c^2$) WIMPs are significantly increased. We fit 3903 days of SK data contribution annihilation found...
We present a search for an excess of neutrino interactions due to dark matter in the form weakly interacting massive particles (WIMPs) annihilating Galactic center or halo based on data set Super-Kamiokande-I, -II, -III and -IV taken from 1996 2016. model flux, energy, flavor distributions assuming WIMP self-annihilation is dominant $\ensuremath{\nu}\overline{\ensuremath{\nu}}$, ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, $b\overline{b}$, ${W}^{+}{W}^{\ensuremath{-}}$. The...
We have searched for proton into muon plus neutral kaon using data from a 91.7 kiloton-year exposure of Super-Kamiokande-I, 49.2 Super-Kamiokande-II, and 31.9 Super-Kamiokande-III. The number candidate events in the was consistent with atmospheric neutrino background expectation no evidence decay this mode found. set partial lifetime lower limit 1.6x10^33 years at 90% confidence level.
A search for the dinucleon decay $pp\ensuremath{\rightarrow}{K}^{+}{K}^{+}$ has been performed using $91.6\text{ }\text{ }\mathrm{kton}\ifmmode\cdot\else\textperiodcentered\fi{}\text{yr}$ data from Super-Kamiokande-I. This provides a sensitive probe of $R$-parity-violating parameter ${{\ensuremath{\lambda}}_{112}}^{\ensuremath{'}\ensuremath{'}}$. boosted decision tree analysis found no signal candidates in data. The expected background was $0.28\ifmmode\pm\else\textpm\fi{}0.19$ atmospheric...
The trilepton nucleon decay modes p→e+νν and p→μ+νν violate |Δ(B-L)| by two units. Using data from a 273.4 kt yr exposure of Super-Kamiokande search for these decays yields fit consistent with no signal. Accordingly, lower limits on the partial lifetimes τp→e+νν>1.7×10(32) years τp→μ+νν>2.2×10(32) at 90% confidence level are obtained. These can constrain Grand Unified Theories which allow such processes.
We present the development of neutron-tagging techniques in Super-Kamiokande IV using a neural network analysis. The detection efficiency neutron capture on hydrogen is estimated to be 26%, with mis-tag rate 0.016 per neutrino event. uncertainty tagging 9.0%. Measurement data from an Americium-Beryllium calibration agrees this value within 10%. procedure was performed 3,244.4 days SK-IV atmospheric data, identifying 18,091 neutrons 26,473 events. fitted lifetime measured as 218 \pm 9 \mu s.