A5086275868- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Advanced Data Storage Technologies
- advanced mathematical theories
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- Algorithms and Data Compression
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Probability and Risk Models
Columbia University
2016-2025
A. Alikhanyan National Laboratory
2024
Atlas Scientific (United States)
2024
The University of Adelaide
2013-2023
University of Geneva
2023
Rutherford Appleton Laboratory
2023
Alexandru Ioan Cuza University
2020
National Institute for Research and Development of Isotopic and Molecular Technologies
2015-2016
Universitatea Națională de Știință și Tehnologie Politehnica București
2016
European Organization for Nuclear Research
2012
During an energy scan at the Cornell Electron Storage Ring, with use of Columbia University-Stony Brook NaI detector, enhancement in $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons})$ is observed center-of-mass \ensuremath{\sim}10.55 GeV. The mass and leptonic width this state (${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}\ensuremath{'}}$) suggest that it $4^{3}S_{1}$ bound $b$ quark its antiquark. After applying to data a cut (pseudo) thrust...
The $\ensuremath{\Upsilon}$, ${\ensuremath{\Upsilon}}^{\ensuremath{'}}$, and ${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}}$ states have been observed at the Cornell Electron Storage Ring as narrow peaks in $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons})$ versus beam energy. Data were collected during a run with integrated luminosity of 1000 ${\mathrm{nb}}^{\ensuremath{-}1}$, using Columbia University-Stony Brook segmented NaI detector....
The masses, total widths, and leptonic widths of three triplet $s$-wave $b\overline{b}$ states $\ensuremath{\Upsilon}(4S)$, $\ensuremath{\Upsilon}(5S)$, $\ensuremath{\Upsilon}(6S)$ are determined from measurements the ${e}^{+}{e}^{\ensuremath{-}}$ annihilation cross section into hadrons for $10.55<W<11.25$ GeV. resonances identified potential model results their properties obtained with help a simplified coupled-channels calculation. We find $M(4S)=10.577$ GeV, $\ensuremath{\Gamma}(4S)=25$...
In a continuing study of the spectroscopy $b\overline{b}$ bound quark systems discovery lowest $P$-wave states by observation photons from decays $2^{3}S_{1}(b\overline{b})\ensuremath{\rightarrow}\ensuremath{\gamma}+1^{3}P_{J}(b\overline{b})$ and $1^{3}P_{J}(b\overline{b})\ensuremath{\rightarrow}\ensuremath{\gamma}+1^{3}S_{1}(b\overline{b})$ is reported. The are observed as narrow enhancements in inclusive photon spectrum ${\ensuremath{\Upsilon}}^{\ensuremath{'}}$ decays. center gravity...
The existence of $P$-wave $b\overline{b}$ bound states ${{\ensuremath{\chi}}_{b}}^{\ensuremath{'}}$ is demonstrated by observation photons from the transition ${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}+{{\ensuremath{\chi}}_{b}}^{\ensuremath{'}}$ in inclusive photon spectrum ${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}}$ decays. center gravity observed energies 98 MeV and branching ratio for to...
Using the Columbia University--Stony Brook (CUSB-II) detector we have studied inclusive photon spectrum from 2.9\ifmmode\times\else\texttimes\fi{}${10}^{4}$ \ensuremath{\Upsilon}(5S) decays. We observe a strong signal due to ${\mathit{B}}^{\mathrm{*}}$\ensuremath{\rightarrow}B\ensuremath{\gamma} From this obtain (i) average ${\mathit{B}}^{\mathrm{*}}$-B mass difference, 46.7\ifmmode\pm\else\textpm\fi{}0.4 MeV, (ii) yield per decay,...
We have observed production of monochromatic low-energy photons in ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ interactions between 10.6 and 11.2 GeV/${c}^{2}$. show that this signal is associated with the b-flavored meson pairs, interpret it as due to decay ${B}^{\mathrm{*}}$\ensuremath{\rightarrow}B+\ensuremath{\gamma}. This first experimental evidence for existence vector b\ifmmode \bar{u}\else \={u}\fi{} or bd\ifmmode\bar\else\textasciimacron\fi{} bound states. determine mass difference...
We have searched for monochromatic photon signals in the reaction \ensuremath{\Upsilon}(9460)\ensuremath{\rightarrow}X+\ensuremath{\gamma} a sample of 420 000 \ensuremath{\Upsilon} decays observed CUSB detector. From absence signal we obtain upper limits Higgs-boson production decay which approach minimal-standard-model expectations, including QCD radiative corrections, low masses. For two models bounds on ratio vacuum expectation values neutral Higgs fields as function mass. do not confirm...
The CUSB detector at the Cornell Electron Storage Ring has been used to measure $R=\frac{\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons})}{\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})}$ in c.m. energy regions between ${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}}$ and ${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}\ensuremath{'}}$, above...
In a sample of 10 000 ${\ensuremath{\Upsilon}}^{\ensuremath{'}}$ decays observed with our nonmagnetic detector at the Cornell Electron Storage Ring, we find 23 events consistent decay ${\ensuremath{\Upsilon}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\Upsilon}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. We derive branching fraction...
Using the Colubia University---Stony Brook detector we have measured production of energetic electrons ($E>1$ GeV) in ${e}^{+}{e}^{\ensuremath{-}}$ annihilations center-of-mass energy range 10.4 to 11.4 GeV. We observe an enhanced electron signal at ${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}\ensuremath{'}}(4S)$ resonance, which interpret as evidence for $\ensuremath{\beta}$ decay a new flavor quark, $b$, bound within meson, $B$. derive branching ratio...
Evidence for the possible production, and rapid decay into ${e}^{+}{e}^{\ensuremath{-}}$ pairs, of a new, light particle in heavy-ion collisions motivates reexamination searches particles upsilon decays. We have searched $\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}+\ensuremath{\alpha}$, where $\ensuremath{\alpha}$ subsequently decays an pair detector. observe no evidence this decay, obtain upper limit branching ratio. also show that our excludes possibility...
We have used the CUSB detector at Cornell Electron Storage Ring to study decays of $\ensuremath{\Upsilon}(1S)$ and $\ensuremath{\Upsilon}(3S)$ resonances into a single photon plus long-lived noninteracting particle. obtain an upper limit on branching ratio for $\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}+X$, where $X$ is undetected. This 3.5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ (90% C.L.) masses ${m}_{X}$ less than 7 GeV. For...
Evidence is presented for the production of ${{\ensuremath{\chi}}_{b}}^{\ensuremath{'}}$ states ($2^{3}P$) in reaction ${\ensuremath{\Upsilon}}^{\ensuremath{'}\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}{{\ensuremath{\chi}}_{b}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}{\ensuremath{\Upsilon}}^{\ensuremath{'}} (or \ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\Upsilon})$ with subsequent decay...