Bruce Brown
A5012309947- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Applications
- Gyrotron and Vacuum Electronics Research
- Magnetic Properties of Alloys
- Electric Motor Design and Analysis
- Radiation Detection and Scintillator Technologies
- Magnetic confinement fusion research
- Muon and positron interactions and applications
- Nuclear physics research studies
- Cold Atom Physics and Bose-Einstein Condensates
- Crafts, Textile, and Design
- Nuclear and radioactivity studies
- Photocathodes and Microchannel Plates
- American Constitutional Law and Politics
- Design Education and Practice
The University of Texas at Arlington
2024
Brigham Young University
2023
Fermi National Accelerator Laboratory
2012-2022
Fermi Research Alliance
2002-2021
University of Southern California
2017-2019
University of Missouri–Kansas City
2019
Royal College of Art
2018
University of Auckland
2017
Indiana University
2005-2017
SLAC National Accelerator Laboratory
2000-2005
Dimuon production is studied in 400-GeV proton-nucleus collisions. A strong enhancement observed at 9.5 GeV mass a sample of 9000 dimuon events with ${m}_{{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}}>5$ GeV.
The MiniBooNE experiment at Fermilab reports results from an analysis of $\bar \nu_e$ appearance data $11.27 \times 10^{20}$ protons on target in antineutrino mode, increase approximately a factor two over the previously reported results. An event excess $78.4 \pm 28.5$ events ($2.8 \sigma$) is observed energy range $200<E_\nu^{QE}<1250$ MeV. If interpreted two-neutrino oscillation model, $\bar{\nu}_{\mu}\rightarrow\bar{\nu}_e$, best fit to has probability 66% while background-only...
The MiniBooNE Collaboration reports first results of a search for $\nu_e$ appearance in $\nu_\mu$ beam. With two largely independent analyses, we observe no significant excess events above background reconstructed neutrino energies 475 MeV. data are consistent with oscillations within appearance-only oscillation model.
The MiniBooNE experiment at Fermilab reports results from an analysis of $\nu_e$ appearance data $12.84 \times 10^{20}$ protons on target in neutrino mode, increase approximately a factor two over previously reported results. A charged-current quasielastic event excess $381.2 \pm 85.2$ events ($4.5 \sigma$) is observed the energy range $200<E_\nu^{QE}<1250$~MeV. Combining these with $\bar \nu_e$ $11.27 antineutrino total plus $460.5 99.0$ ($4.7 observed. If interpreted two-neutrino...
The MiniBooNE experiment at Fermilab reports results from a search for ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\rightarrow}{\overline{\ensuremath{\nu}}}_{e}$ oscillations, using data sample corresponding to $5.66\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target. An excess of $20.9\ifmmode\pm\else\textpm\fi{}14.0$ events is observed in the energy range $475<{E}_{\ensuremath{\nu}}^{\mathrm{QE}}<1250\text{ }\text{ }\mathrm{MeV}$, which, when constrained by...
A high-statistics sample of charged-current muon neutrino scattering events collected with the MiniBooNE experiment is analyzed to extract first measurement double differential cross section ($\frac{d^2\sigma}{dT_\mu d\cos\theta_\mu}$) for quasielastic (CCQE) on carbon. This result features minimal model dependence and provides most complete information this process date. With assumption CCQE scattering, absolute as a function energy ($\sigma[E_\nu]$) single ($\frac{d\sigma}{dQ^2}$) are...
The MiniBooNE Collaboration observes unexplained electronlike events in the reconstructed neutrino energy range from 200 to 475 MeV. With $6.46\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target, 544 are observed this range, compared an expectation of $415.2\ifmmode\pm\else\textpm\fi{}43.4$ events, corresponding excess $128.8\ifmmode\pm\else\textpm\fi{}20.4\ifmmode\pm\else\textpm\fi{}38.3$ events. shape several kinematic variables is consistent with being due either...
The Booster Neutrino Experiment (MiniBooNE) searches for numu-to-nue oscillations using the O(1 GeV) neutrino beam produced by synchrotron at Fermi National Accelerator Laboratory (FNAL). delivers protons with 8 GeV kinetic energy (8.89 GeV/c momentum) to a beryllium target, producing neutrinos from decay of secondary particles in line. We describe Monte Carlo simulation methods used estimate flux beamline incident on MiniBooNE detector both polarities focussing horn. uses Geant4 framework...
The MiniBooNE experiment at Fermilab reports a total excess of $638.0\ifmmode\pm\else\textpm\fi{}52.1(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}122.2(\mathrm{syst}.)$ electronlike events from data sample corresponding to $18.75\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons-on-target in neutrino mode, which is 46% increase the with respect previously published results and $11.27\ifmmode\times\else\texttimes\fi{}{10}^{20}$ antineutrino mode. overall significance excess,...
The observation of neutrino oscillations is clear evidence for physics beyond the standard model. To make precise measurements this phenomenon, oscillation experiments, including MiniBooNE, require an accurate description charged current quasielastic (CCQE) cross sections to predict signal samples. Using a high-statistics sample νμ CCQE events, MiniBooNE finds that simple Fermi gas model, with appropriate adjustments, accurately characterizes events observed in carbon-based detector....
The largest sample ever recorded of ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ charged-current quasielastic (CCQE, ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}+p\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}+n$) candidate events is used to produce the minimally model-dependent, flux-integrated double-differential cross section $\frac{{d}^{2}\ensuremath{\sigma}}{d{T}_{\ensuremath{\mu}}d\mathrm{cos}{\ensuremath{\theta}}_{\ensuremath{\mu}}}$ for CCQE a mineral oil target. This...
We report final results of a series measurements continuum dimuon production in proton-nucleus collisions at Fermilab. New with 6 times more statistics are included. A full description the apparatus and methods used analysis this is given. The sea quark distribution nucleon determined within context Drell-Yan quantum-chromodynamic dilepton hadron collisions.
The mass spectrum of muon pairs in the range 5 to 15 GeV is studied inclusive reaction $p+\mathrm{nucleus}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}+{\ensuremath{\mu}}^{\ensuremath{-}}+\mathrm{anything}$. $\ensuremath{\Upsilon}$ and continuum distribution are presented as $A$ dependence continuum. Comparison with a parton-annihilation model yields sea-quark distribution.
We report a measurement of the flux-averaged neutral-current elastic differential cross section for neutrinos scattering on mineral oil (${\mathrm{CH}}_{2}$) as function four-momentum transferred squared, ${Q}^{2}$. It is obtained by measuring kinematics recoiling nucleons with kinetic energy greater than 50 MeV which are readily detected in MiniBooNE. This cross-section distribution fit fixed nucleon form factors apart from an axial mass ${M}_{A}$ that provides best...
A search for sub-GeV dark matter produced from collisions of the Fermilab 8 GeV Booster protons with a steel beam dump was performed by MiniBooNE-DM Collaboration using data $1.86\ifmmode\times\else\texttimes\fi{}{10}^{20}$ on target in dedicated run. The MiniBooNE detector, consisting 818 tons mineral oil and located 490 meters downstream dump, is sensitive to variety initiated scattering reactions. Three interactions are considered this analysis: elastic off nucleons, inelastic neutral...
Using a high-statistics, high-purity sample of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$-induced charged current, pion events in mineral oil (${\mathrm{CH}}_{2}$), MiniBooNE reports collection interaction cross sections for this process. This includes measurements the $\mathrm{CC}{\ensuremath{\pi}}^{+}$ section as function neutrino energy, well flux-averaged single- and double-differential energy direction both final-state muon pion. In addition, each single-differential are extracted to...
The MiniBooNE-DM Collaboration searched for vector-boson mediated production of dark matter using the Fermilab 8-GeV Booster proton beam in a dedicated run with 1.86×10^{20} protons delivered to steel dump. MiniBooNE detector, 490 m downstream, is sensitive via elastic scattering nucleons detector mineral oil. Analysis methods developed previous results were employed, and several constraining data sets simultaneously analyzed minimize systematic errors from neutrino flux interaction rates....
The SciBooNE and MiniBooNE collaborations report the results of a ν_μdisappearance search in Δm^2 region 0.5-40 eV^2. neutrino rate as measured by tracking detectors is used to constrain at Cherenkov detector first joint analysis data from both collaborations. Two separate analyses combined samples set 90% confidence level (CL) limits on eV^2 region, with an improvement over previous experimental constraints between 10 30
We present proton-nucleus dimuon-production cross sections for masses between 4 and 15 GeV, center-of-mass rapidities -0.23 0.6 incident energies of 200, 300, 400 GeV. The data confirm scaling to the 20% level. dependence continuum $〈{p}_{T}〉$ on beam energy is also presented.
The MiniBooNE Collaboration reports initial results from a search for ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\rightarrow}{\overline{\ensuremath{\nu}}}_{e}$ oscillations. A signal-blind analysis was performed using data sample corresponding to $3.39\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target. are consistent with background prediction across the full range of neutrino energy reconstructed assuming quasielastic scattering,...
Using a custom 3-Čerenkov ring fitter, we report cross sections for νμ-induced charged-current single π0 production on mineral oil (CH2) from sample of 5810 candidate events with 57% signal purity over an energy range 0.5–2.0 GeV. This includes measurements the absolute total section as function neutrino energy, and flux-averaged differential measured in terms Q2, μ− kinematics, kinematics. The yields (9.2±0.3stat±1.5syst)×10−39 cm2/CH2 at mean 0.965 GeV.7 MoreReceived 15 October...
MiniBooNE reports the first absolute cross sections for neutral current single ${\ensuremath{\pi}}^{0}$ production on ${\mathrm{CH}}_{2}$ induced by neutrino and antineutrino interactions measured from largest sets of NC events collected to date. The principal result consists differential as functions momentum angle averaged over flux at MiniBooNE. We find total...
The production of the $\ensuremath{\Upsilon}$ family in proton-nucleus collisions is clarified by a sixfold increase statistics. Constraining $\ensuremath{\Upsilon}$,${\ensuremath{\Upsilon}}^{\ensuremath{'}}$ masses to those observed at DORIS we find statistical significance ${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}}$ be 11 standard deviations. dependence on ${p}_{t}$, $y$, and $s$ presented. Limits for other resonance mass range 4-18 GeV are determined.