A5101669152- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Planetary Science and Exploration
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- Nuclear physics research studies
- Superconducting Materials and Applications
- Stochastic processes and statistical mechanics
- Scientific Research and Discoveries
- Marine and environmental studies
- Quantum, superfluid, helium dynamics
- advanced mathematical theories
- Astrophysics and Cosmic Phenomena
- Advanced Data Storage Technologies
- Medical Imaging Techniques and Applications
- Isotope Analysis in Ecology
- Quantum chaos and dynamical systems
- Space Science and Extraterrestrial Life
University of Cambridge
2024-2025
University of Warwick
2024
The Ohio State University
1992-1997
University of California, San Diego
1996
University of Minnesota
1996
Vanderbilt University
1996
Southern Methodist University
1995
University of Hawaiʻi at Mānoa
1994
Purdue University West Lafayette
1994
University of Oklahoma
1994
We have measured the inclusive $b\ensuremath{\rightarrow}s\ensuremath{\gamma}$ branching ratio to be $(2.32\ifmmode\pm\else\textpm\fi{}0.57\ifmmode\pm\else\textpm\fi{}0.35)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, where first error is statistical and second systematic. Upper lower limits on ratio, each at 95% C.L., are $B(b\ensuremath{\rightarrow}s\ensuremath{\gamma})<4.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$...
We have observed the decays ${\mathit{B}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{*}}$(892${)}^{0}$\ensuremath{\gamma} and ${\mathit{B}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{*}}$(892${)}^{\mathrm{\ensuremath{-}}}$\ensuremath{\gamma}, which are evidence for quark-level process b\ensuremath{\rightarrow}s\ensuremath{\gamma}. The average branching fraction is...
We have fully reconstructed decays of both B0 and B- Mesons into final states containing either D, D*, D**, Psi, Psi', or Chi_{c1} mesons. This allows us to obtain new results on many physics topics including branching ratios, tests the factorization hypothesis, color suppression, resonant substructure, - mass difference.
Using data collected by the CLEO II detector, we have observed two states decaying to ${\ensuremath{\Lambda}}_{c}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. Relative ${\ensuremath{\Lambda}}_{c}^{+}$, their mass splittings are measured be $+307.5\ifmmode\pm\else\textpm\fi{}0.4\ifmmode\pm\else\textpm\fi{}1.0$ and $+342.2\ifmmode\pm\else\textpm\fi{}0.2\ifmmode\pm\else\textpm\fi{}0.5\mathrm{MeV}{/c}^{2}$, respectively; this represents first measurement of less massive state....
Using a sample of $2.6\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4\mathrm{S})\ensuremath{\rightarrow}B\overline{B}$ events collected with the CLEO II detector at Cornell Electron Storage Ring, we have measured form factors for ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{*+}{\ensuremath{\ell}}^{\ensuremath{-}}\overline{\ensuremath{\nu}}$. We perform three-parameter fit joint distribution four kinematic variables to obtain form-factor ratios...
Using data recorded by the CLEO-II detector at Cornell Electron Storage Ring (CESR), we report first observation of a narrow state decaying into Ξ+cπ−. The has mass difference M(Ξ+cπ−)−M(Ξ+c) 178.2 ± 0.5 1.0 MeV/c2, and width <5.5 MeV/c2 (90% confidence level limit). most likely explanation this new is that it Ξ*0c, JP=32+ spin excitation Ξ0c charmed baryon.Received 15 August 1995DOI:https://doi.org/10.1103/PhysRevLett.75.4364©1995 American Physical Society
Using the CLEO-II detector, we have obtained evidence for a new meson decaying to $D^0 K^+$. Its mass is $2573.2^{+1.7}_{-1.6}\pm 0.8\pm 0.5$ {}~MeV/$c^2$ and its width $16^{+5}_{-4}\pm 3$~MeV/$c^2$. Although do not establish spin parity, consistent with predictions an $L=1$, $S=1$, $J_P=2^+$ charmed strange state.
Using the CLEO II data sample, with an integrated luminosity of 1.8 fb−1 at and near Υ(4S) resonance, we have observed a signal for D0→K+π−, which could be due to either D0D¯0 mixing or doubly Cabibbo suppressed decay, combination two. We find scrB(D0→K+π−)/scrB(D0→K−π+)=0.0077±0 .0025(stat) ±0.0025(syst).Received 2 December 1993DOI:https://doi.org/10.1103/PhysRevLett.72.1406©1994 American Physical Society
The angular distributions of the decay Λ+c→Λe+νe have been studied using CLEO II detector. By performing a three-dimensional maximum likelihood fit, form factor ratio R=f2/f1 is determined to be −0.25±0.14±0.08. asymmetry parameter Λc averaged over q2 calculated αΛc=−0.82+0.09+0.06−0.06−0.03.Received 13 January 1995DOI:https://doi.org/10.1103/PhysRevLett.75.624©1995 American Physical Society
We have observed five new decay modes of the charmed baryon ${\ensuremath{\Lambda}}_{c}^{+}$ using data collected with CLEO II detector. Four modes, ${\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}p{\overline{K}}^{0}\ensuremath{\eta}$, $\ensuremath{\Lambda}\ensuremath{\eta}{\ensuremath{\pi}}^{+}$, ${\ensuremath{\Sigma}}^{+}\ensuremath{\eta}$, and ${\ensuremath{\Sigma}}^{*+}\ensuremath{\eta}$, are first observations final states an $\ensuremath{\eta}$ meson, while fifth mode,...
A limit on the tau neutrino mass ${\mathit{M}}_{\ensuremath{\nu}\mathrm{\ensuremath{\tau}}}$ is obtained from a study of decays in reaction ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\tau}}}^{+}$${\mathrm{\ensuremath{\tau}}}^{\mathrm{\ensuremath{-}}}$ at center-of-mass energies \ensuremath{\sim}10.6 GeV. The result based an end-point analysis invariant spectrum decay products modes...
Using date from ${e}^{+}{e}^{\ensuremath{-}}$ annihilation into hadrons taken on the $\ensuremath{\Upsilon}(1S)$ and continuum, we are able to compare event properties of three-gluon ($\mathrm{ggg}$) quark-antiquark ($q\overline{q}$) decays. By tagging radiative decays $\ensuremath{\Upsilon}(3S)$ ${\ensuremath{\chi}}_{b}^{\ensuremath{'}}$ states, can make comparisons shapes with continuum $\mathrm{ggg}$ $\ensuremath{\Upsilon}(1S)$. Contrary notion that two-gluon ($\mathrm{gg}$) events...
Using data from CLEO II at the Cornell Electron Storage Ring we provide a new measurement of branching fraction for D0→π+π−, and present first measurements D0→π0π0 D+→π+π0, which is due to an isospin changing ΔI=3/2 transition. From these extract ratio amplitudes ‖A2/A0‖, cosine relative phase δ=δ2-δ0 between amplitudes, D→ππ decays. Unlike situation in kaon decay where A2 strongly suppressed, find ‖A2/A0‖=0.72±0.13±0.11 cosδ=0.14±0.13±0.09.Received 11 June...
Using the CLEO-II detector, branching ratio of Cabibbo suppressed decay ${\mathit{D}}^{+}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{0}$${\mathit{l}}^{+}$\ensuremath{\nu}, relative to favored ${\mathit{D}}^{+}$\ensuremath{\rightarrow}K${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}^{0}$${\mathit{l}}^{+}$\ensuremath{\nu}, is measured be...
We report the measurement of new modes charmed baryon Λ+c using data recorded by CLEO II detector at Cornell Electron Storage Ring. find branching ratios, relative to Λ+c→pK−π+, 0.070±0.011±0.011 for Λ+c→Σ+K+K−, 0.069±0.023±0.016 Λ+c→Σφ, 0.078±0.013±0.013 Λ+c→Ξ0K+, and 0.053±0.016±0.010 Λ+c→Ξ*0K+. These measurements indicate that W-exchange diagrams contribute decay. have also made a previously found mode Λ+c→Ξ−K+π+.Received 6 May 1993DOI:https://doi.org/10.1103/PhysRevLett.71.2391©1993...
We have searched for ${B}^{0}$ decays to two charged leptons and set 90% confidence level upper limits on the branching fractions: $B({B}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})<5.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $B({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})<5.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$,...
We search for the radiative leptonic tau decays $\ensuremath{\tau}\ensuremath{\rightarrow}{\mathrm{ee}}^{+}{e}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}}{\ensuremath{\nu}}_{e}$ and $\ensuremath{\tau}\ensuremath{\rightarrow}\ensuremath{\mu}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ using $3.60{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected by CLEO-II experiment at Cornell Electron Storage Ring. present a first...
Using the CLEO~II detector we measure ${\cal B}(D_s^+\to ηe^+ν)/{\cal ϕe^+ν) =1.24\pm0.12\pm0.15$, η' e^+ν)/{\cal =0.43\pm0.11\pm0.07$ and ηe^+ν) =0.35\pm0.09\pm0.07$. We find vector to pseudoscalar ratio, ϕe^+ν)/{\cal (η+η') e^+ν) =0.60\pm0.06\pm0.06$, which is similar ratio found in non strange $D$ decays.