A5038389060- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Data Visualization and Analytics
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Video Analysis and Summarization
- Particle Detector Development and Performance
- Tactile and Sensory Interactions
- Electron and X-Ray Spectroscopy Techniques
- Interactive and Immersive Displays
- Particle Accelerators and Free-Electron Lasers
- Multimedia Communication and Technology
- Advanced Radiotherapy Techniques
- Scientific Research and Discoveries
- Radiation Therapy and Dosimetry
- Radiation Detection and Scintillator Technologies
- Quantum chaos and dynamical systems
Massachusetts Institute of Technology
1970-2025
Deutsches Elektronen-Synchrotron DESY
1969-1972
Haverford College
1971
University of Birmingham
1971
University of Washington
1971
We report the observation of a heavy particle $J$, with mass $m=3.1$ GeV and width approximately zero. The was made from reaction $p+\mathrm{Be}\ensuremath{\rightarrow}{e}^{+}+{e}^{\ensuremath{-}}+x$ by measuring ${e}^{+}{e}^{\ensuremath{-}}$ spectrum precise pair spectrometer at Brookhaven National Laboratory's 30-GeV alternating-gradient synchrotron.
We present results of measurements on photoproduction $\ensuremath{\rho}$ mesons. Analysis ${10}^{6}$ measured events in a four-dimensional data matrix $\frac{d\ensuremath{\sigma}(A, m, p, {t}_{\ensuremath{\perp}})}{d\ensuremath{\Omega}\mathrm{dm}}$ with dimensions 14\ifmmode\times\else\texttimes\fi{}20\ifmmode\times\else\texttimes\fi{}10\ifmmode\times\else\texttimes\fi{}20 yields precise information nuclear density distributions for production. obtain the Woods-Saxon radii...
We present results on the determination of a set strong-interaction nuclear radii using photoproduction neutral rho mesons. Analysis ${10}^{6}$ events from 13 complex nuclei yields Woods-Saxon $R(A)=(1.12\ifmmode\pm\else\textpm\fi{}0.02){A}^{\frac{1}{3}}$ fm.
We present Umwelt, an authoring environment for interactive multimodal data representations. In contrast to prior approaches, which center the visual modality, Umwelt treats visualization, sonification, and textual description as coequal representations: they are all derived from a shared abstract model, such that no modality is prioritized over others. To simplify specification, evaluates set of heuristics generate default representations express dataset's functional relationships. support...
We report a high-statistics experiment measuring the structure of ${e}^{+}{e}^{\ensuremath{-}}$ mass spectrum from photoproduction $\ensuremath{\rho}$ and $\ensuremath{\omega}$ mesons. At 5.1 GeV, based on 4000 events, analysis spectra yields ratio vector-meson-photon coupling constants $\frac{{{\ensuremath{\gamma}}_{\ensuremath{\omega}}}^{2}}{{{\ensuremath{\gamma}}_{\ensuremath{\rho}}}^{2}}={9.4}_{\ensuremath{-}1.6}^{+2.6}$ $\ensuremath{\rho}\ensuremath{-}\ensuremath{\omega}$ phase...
A high-statistics (100 000 events) measurement of photoproduction charged pion pairs on protons is reported in two parts. First, the measured cross sections are presented a three-dimensional data matrix where all dynamical features explicitly shown. Second, fitting energy region 2.6-6.8 GeV with various assumptions $\ensuremath{\rho}$ production indicates that ${\frac{d\ensuremath{\sigma}}{\mathrm{dt}}|}_{t=0}$ for decreases increasing similar to $\ensuremath{\pi}N$ scattering.
We have measured the yield of ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ pairs from reaction $\ensuremath{\gamma}+\mathrm{C}\ensuremath{\rightarrow}\mathrm{C}+{\ensuremath{\pi}}^{+}+{\ensuremath{\pi}}^{\ensuremath{-}}$ in invariant-mass region $0.6<m<1.8 \frac{\mathrm{GeV}}{{c}^{2}}$. The result, based on ${10}^{5}$ events, shows that data, at high energy and very small momentum transfer, exhibit an enhancement $1.3<m<1.8
We have measured large-angle electron-positron pairs from the reaction $\ensuremath{\gamma}+\mathrm{Be}\ensuremath{\rightarrow}\mathrm{Be}+{e}^{+}+{e}^{\ensuremath{-}}$ in ${e}^{+}{e}^{\ensuremath{-}}$ invariant-mass region $610<m<850 \frac{\mathrm{MeV}}{{c}^{2}}$. The phase of photoproduction amplitude $\ensuremath{\rho}$ meson at 4.1-6.1 GeV was found to deviate pure imaginary by 11.8\ifmmode^\circ\else\textdegree\fi{}\ifmmode\pm\else\textpm\fi{}4.4\ifmmode^\circ\else\textdegree\fi{}...
We have studied $\ensuremath{\rho}\ensuremath{-}\ensuremath{\omega}$ interference in di-pion photoproduction the energy range 5-7 GeV with a total of 630 000 pion pairs from hydrogen, carbon, and lead. The mass spectra show clear vicinity $\ensuremath{\omega}$ mass. A branching ratio...
After the discovery of $J$ particle at 3.1-GeV mass we have made an extensive search for heavier particles in region 3.2 to 4.0 GeV. To a level 1% (3.1 GeV) yield, and with 90% confidence, no were found.
Photoproduction of $\ensuremath{\phi}$ mesons from hydrogen and carbon was studied at 5.2 GeV by observing $\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ decays. The results show that $\ensuremath{\phi}$'s are produced diffractively with a $\ensuremath{\phi}$-nucleon cross section ${\ensuremath{\sigma}}_{\ensuremath{\phi}N}={9.8}_{\ensuremath{-}3.3}^{+2.9}$ mb. In addition, 80 000 pion pairs were measured to search for the $G$-parity-nonconserving decay...
We report here on an experiment done at the 30-GeV proton synchrotron Brookhaven National Laboratory using a large-acceptance ($\ensuremath{\Delta}m=1$ GeV) pair spectrometer with mass resolution of \ifmmode\pm\else\textpm\fi{}5 MeV, to search for additional long-lived particles which decay into ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, ${K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, $\overline{p}p$, ${K}^{+}{K}^{\ensuremath{-}}$,...
We report here the observation of surprisingly simple behaviors in massive-hadron-pair ($m>2$ GeV) production from proton-nucleon collisions. With a 28.6-GeV incident proton beam and pair spectrometer to detect hadrons, measured cross section decreases like $\frac{{d}^{2}\ensuremath{\sigma}}{\mathrm{dxdm}}\ensuremath{\propto}{e}^{\ensuremath{-}5m}$ can be grouped into three groups: ${\ensuremath{\pi}}^{\ensuremath{-}}+p$; ${\ensuremath{\pi}}^{+}+{\ensuremath{\pi}}^{\ensuremath{-}}$,...