W. A. Mann
A5029090785- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Nuclear physics research studies
- Radio Astronomy Observations and Technology
- Noncommutative and Quantum Gravity Theories
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Pulsars and Gravitational Waves Research
- Muon and positron interactions and applications
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Precipitation Measurement and Analysis
- Atmospheric Ozone and Climate
- Chemical and Physical Properties of Materials
- Superconducting Materials and Applications
- Radiation Therapy and Dosimetry
- Black Holes and Theoretical Physics
Tufts University
2016-2025
University of Oxford
2001-2023
Minerva Foundation
2022-2023
Massachusetts College of Liberal Arts
2021
Federico Santa María Technical University
2018
University of Freiburg
2010-2011
University of California, Santa Cruz
2010
Max Planck Institute for Physics
2010
Délégation Paris 7
2008-2009
National and Kapodistrian University of Athens
2008-2009
We report the results of a search for ${\ensuremath{\nu}}_{e}$ appearance in ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ beam MINOS long-baseline neutrino experiment. With an improved analysis and increased exposure $8.2\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on NuMI target at Fermilab, we find that $2{sin}^{2}({\ensuremath{\theta}}_{23}){sin}^{2}(2{\ensuremath{\theta}}_{13})<0.12(0.20)$ 90% confidence level $\ensuremath{\delta}=0$ normal (inverted) mass hierarchy, with best-fit...
This white paper addresses the hypothesis of light sterile neutrinos based on recent anomalies observed in neutrino experiments and latest astrophysical data.
This Letter reports new results from the MINOS experiment based on a two-year exposure to muon neutrinos Fermilab NuMI beam. Our data are consistent with quantum-mechanical oscillations of neutrino flavor mass splitting |Deltam2| = (2.43+/-0.13) x 10(-3) eV2 (68% C.L.) and mixing angle sin2(2theta) > 0.90 (90% C.L.). disfavor two alternative explanations for disappearance in flight: namely, decays into lighter particles quantum decoherence neutrinos, at 3.7 5.7 standard-deviation levels,...
Measurements of neutrino oscillations using the disappearance muon neutrinos from Fermilab NuMI beam as observed by two MINOS detectors are reported. New analysis methods have been applied to an enlarged data sample exposure 7.25×10(20) protons on target. A fit yields values |Δm(2)|=(2.32(-0.08)(+0.12))×10(-3) eV(2) for atmospheric mass splitting and sin(2)(2θ)>0.90 (90% C.L.) mixing angle. Pure decay quantum decoherence hypotheses excluded at 7 9 standard deviations, respectively.
We report measurements of oscillation parameters from ν(μ) and disappearance using beam atmospheric data MINOS. The comprise exposures 10.71×10(20) protons on target in the ν(μ)-dominated beam, 3.36×10(20) ν(μ)-enhanced 37.88 kton yr neutrinos. Assuming identical ν parameters, we measure |Δm2| = (2.41(-0.10)(+0.09))×10(-3) eV2 sin2(2θ) 0.950(-0.036)(+0.035). Allowing independent oscillations, antineutrino (2.50(-0.25)(+0.23))×10(-3) 0.97(-0.08)(+0.03), with minimal change to neutrino parameters.
We report on a new analysis of neutrino oscillations in MINOS using the complete set accelerator and atmospheric data. The combines $\nu_{\mu}$ disappearance $\nu_{e}$ appearance data three-flavor formalism. measure $|\Delta m^{2}_{32}|=[2.28-2.46]\times10^{-3}\mbox{\,eV}^{2}$ (68% C.L.) $\sin^{2}\theta_{23}=0.35-0.65$ (90% normal hierarchy, m^{2}_{32}|=[2.32-2.53]\times10^{-3}\mbox{\,eV}^{2}$ $\sin^{2}\theta_{23}=0.34-0.67$ inverted hierarchy. also constrain $\delta_{CP}$, $\theta_{23}$...
We report on ν(e) and appearance in ν(μ) beams using the full MINOS data sample. The comparison of these at a 735 km baseline with θ13 measurements by reactor experiments probes δ, θ23 octant degeneracy, mass hierarchy. This analysis is first use this technique includes accelerator long-baseline search for → ν(e). Our disfavor 31% (5%) three-parameter space defined θ23, hierarchy 68% (90%) C.L. measure value 2sin(2)(2θ13)sin(2)(θ23) that consistent experiments.
The MINERvA experiment is designed to perform precision studies of neutrino-nucleus scattering using $\nu_\mu$ and ${\bar\nu}_\mu$ neutrinos incident at 1-20 GeV in the NuMI beam Fermilab. This article presents a detailed description \minerva detector describes {\em ex situ} techniques employed characterize monitor its performance. comprised finely-segmented scintillator-based inner tracking region surrounded by electromagnetic hadronic sampling calorimetry. upstream portion includes planes...
A search for mixing between active neutrinos and light sterile has been performed by looking muon neutrino disappearance in two detectors at baselines of 1.04 735 km, using a combined MINOS MINOS+ exposure 16.36×10^{20} protons on target. simultaneous fit to the charged-current neutral-current energy spectra yields no evidence 3+1 model. The most stringent limit date is set parameter sin^{2}θ_{24} values mass splitting Δm_{41}^{2}>10^{-4} eV^{2}.
We report a study of muon neutrino charged-current quasi-elastic events in the segmented scintillator inner tracker MINERvA experiment running NuMI beam at Fermilab. The were selected by requiring {\mu}^- and low calorimetric recoil energy separated from interaction vertex. measure flux-averaged differential cross-section, d{\sigma}/dQ^2, particle content final state. Deviations are found between measured d{\sigma}/dQ^2 expectations model independent nucleons relativistic Fermi gas. also...
We report the results of a search for ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ disappearance by Main Injector Neutrino Oscillation Search [D. G. Michael et al. (MINOS), Phys. Rev. Lett. 97, 191801 (2006).]. The experiment uses two detectors separated 734 km to observe beam neutrinos created Neutrinos at facility Fermi National Accelerator Laboratory. data were collected in first 282 days operations and correspond an exposure $1.27\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target....
We have isolated muon anti-neutrino charged-current quasi-elastic interactions occurring in the segmented scintillator tracking region of MINERvA detector running NuMI neutrino beam at Fermilab. measure flux-averaged differential cross-section, d{\sigma}/dQ^2, and compare to several theoretical models scattering. Good agreement is obtained with a model where nucleon axial mass, M_A, set 0.99 GeV/c^2 but vector form factors are modified account for observed enhancement, relative free case,...
We have studied the quasielastic reaction ${\ensuremath{\nu}}_{\ensuremath{\mu}}n\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}p$ in an exposure of Fermilab deuterium-filled 15-foot bubble chamber to a high-energy wide-band neutrino beam. From analysis ${Q}^{2}$ distribution based on standard $V\ensuremath{-}A$ theory, axial-vector mass dipole parametrization form factor is determined be ${M}_{A}={1.05}_{\ensuremath{-}0.16}^{+0.12}$ GeV, consistent with values previously...
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.
Results are reported from a search for active to sterile neutrino oscillations in the MINOS long-baseline experiment, based on observation of neutral-current interactions, an exposure NuMI beam 7.07×1020 protons target. A total 802 event candidates is observed Far Detector, compared expected number 754±28(stat)±37(syst) among three flavors. The fraction fs disappearing νμ that may transition νs found be less than 22% at 90% C.L.Received 19 April...
Knowledge of the neutrino flux produced by Neutrinos at Main Injector (NuMI) beamline is essential to oscillation and interaction measurements MINERvA, MINOS+, NOvA MicroBooNE experiments Fermi National Accelerator Laboratory. We have a prediction which uses all available relevant hadron production data, incorporating particle off thin targets as well yields from spare NuMI target exposed 120 GeV proton beam. The result most precise achieved for beam in one tens energy region. also compared...
Abstract Scattering of high energy particles from nucleons probes their structure, as was done in the experiments that established non-zero size proton using electron beams 1 . The use charged leptons scattering enables measuring distribution electric charges, which is encoded vector form factors nucleon 2 weakly interacting neutrinos gives opportunity to measure both and axial nucleon, providing an additional, complementary probe structure. transition factor, F A , can be measured neutrino...
A deficit of atmospheric ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ events, consistent with the hypothesis neutrino oscillations, is observed in 5.90 kiloton-year fiducial exposure Soudan 2 detector. An unbinned maximum likelihood analysis $L/E$ distribution has been carried out using Feldman-Cousins prescription. The probability no oscillation $5.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ 90% confidence allowed region...
We have carried out an amplitude analysis of the ${K}_{S}^{0}{K}_{S}^{0}$ system produced in reaction ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{K}_{S}^{0}{K}_{S}^{0}n$ at 23 GeV/c, based on about 15 000 events low-$t$ region ($|t\ensuremath{-}{t}_{min}|<0.1$ Ge${\mathrm{V}}^{2}$). Below 1.6 GeV/${\mathit{c}}^{2}$, our favored solution is very similar to those from previous analyses. For higher masses, we observe decay $h(2040)$ meson. In addition, $l=0$ partial wave...
166 events of the reaction $\ensuremath{\nu}+n\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}+p$ at an average neutrino energy \ensuremath{\sim} 0.7 GeV have been observed in Argonne National Laboratory 12-ft deuterium bubble chamber. The results are well described by conventional current-current weak-interaction theory with three real form factors ${{F}_{V}}^{1}$, ${{F}_{V}}^{2}$, and ${F}_{A}$. Using electron-nucleon scattering to fix vector mass ${M}_{V}$ 0.84 GeV, assuming a...
A search for depletion of the combined flux active neutrino species over a 735 km baseline is reported using neutral-current interaction data recorded by MINOS detectors in NuMI beam. Such not expected according to conventional interpretations oscillation involving three known flavors. would be signature oscillations or decay postulated noninteracting sterile neutrinos, scenarios ruled out existing data. From an exposure 3.18×1020 protons on target which neutrinos energies between ∼500 MeV...
We searched for a sidereal modulation in the MINOS far detector neutrino rate. Such signal would be consequence of Lorentz and CPT violation as described by standard-model extension framework. It also first detection perturbative effect to conventional mass oscillations. found no evidence this signature, upper limits placed on magnitudes violating coefficients describing theory are an improvement factors 20-510 over current best using near detector.