R. Coleman
A5073247325- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Superconducting Materials and Applications
- Odor and Emission Control Technologies
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Advanced Chemical Sensor Technologies
- Wastewater Treatment and Nitrogen Removal
- Particle Detector Development and Performance
- Various Chemistry Research Topics
- Fecal contamination and water quality
- Insect Pheromone Research and Control
- Analytical Chemistry and Chromatography
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Chromium effects and bioremediation
- Adsorption and biosorption for pollutant removal
- Neuroendocrine Tumor Research Advances
National Institute of Economic and Social Research
2020
Fermi National Accelerator Laboratory
2003-2019
University of Alberta
1974-2008
University of Arizona
2000-2001
Alberta Environment and Protected Areas
1983-1996
University of California, Los Angeles
1994-1995
University of Chicago
1979-1993
Columbia University
1976-1987
Princeton University
1979-1986
Elmhurst College
1986
We have compared the decay rates of ${K}_{L}$ and ${K}_{S}$ to ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ final states using a subset data from KTeV experiment (E832) at Fermilab. find that direct-CP-violation parameter $\mathrm{Re}({\ensuremath{\epsilon}}^{\ensuremath{'}}/\ensuremath{\epsilon})$ is equal...
A measurement of the CP-violation parameter Re(ɛ’/ɛ) has been made using full E731 data set. We find Re(ɛ’/ɛ)=(7.4±5.2±2.9)×10−4 where first error is statistical and second systematic.Received 18 January 1993DOI:https://doi.org/10.1103/PhysRevLett.70.1203©1993 American Physical Society
We report evidence, from a study of multihadron final states produced in the wide-band photon beam at Fermilab, for production new antibaryon state which decays into $\overline{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$. The mass this is 2.26 \ifmmode\pm\else\textpm\fi{} 0.01 ${\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c}}^{2}$ and its decay width less than 75 ${\mathrm{M}\mathrm{e}\mathrm{V}/\mathit{c}}^{2}$. also evidence...
We present precise tests of CP and CPT symmetry based on the full dataset K to pipi decays collected by KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, 1999. This contains 16 million 2pi0 69 pi+pi- decays. measure direct violation parameter Re(epsilon'/epsilon) = (19.2 pm 2.1)x10-4. find KL-KS mass difference Deltam (5270 12)x10^6 hbar/s KS lifetime tauS (89.62 0.05)x10-12 s. also several parameters that test invariance. between phase indirect parameter, epsilon,...
Results are presented from a large-acceptance experiment in which muon-pair production was observed the mass range 2 to 11 GeV/${\mathit{c}}^{2}$. Data were taken with ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{+}$, and ${p}^{\ifmmode\pm\else\textpm\fi{}}$ beams at 225 GeV/c on carbon, copper, tungsten targets. Differential cross sections dependence pair mass, ${x}_{\mathrm{F}}$, ${p}_{T}$, incident-particle type, target nucleus discussed.
A very narrow resonance with a mass of 3.105 GeV/${\mathit{c}}^{2}$ is observed in the reaction $\ensuremath{\gamma}+\mathrm{Be}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}+{\ensuremath{\mu}}^{\ensuremath{-}}+X$. The total cross section for this process, as well its $t$ distribution, given.
We present a series of measurements based on ${K}_{L,S}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${K}_{L,S}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ decays collected in 1996--1997 by the $\mathrm{KTeV}$ experiment (E832) at Fermilab. compare these four $\stackrel{\ensuremath{\rightarrow}}{K}\ensuremath{\pi}\ensuremath{\pi}$ decay rates to measure direct $\mathrm{CP}$ violation parameter...
A search for inclusive muon-neutrino (${\ensuremath{\nu}}_{\ensuremath{\mu}}$) oscillations has been performed in the Fermilab narrow-band neutrino beam using two detectors running simultaneously at distances from source. The data show no evidence a distance dependence of flux and rule out ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ into any other single type $30<\ensuremath{\Delta}{m}^{2}<1000$ ${\mathrm{eV}}^{2}$/${\mathit{c}}^{4}$ ${sin}^{2}(2\ensuremath{\theta})>0.02\ensuremath{-}0.20$.
The KTeV/E799 experiment at Fermilab has searched for the rare kaon decay KL→π0e+e− . This mode is expected to have a significant CP violating component. measurement of its branching ratio could support standard model or indicate existence new physics. Letter reports results from 1999–2000 data set. One event observed with an background 0.99±0.35 events. We set limit on 3.5×10−10 90% confidence level. Combining previous result based taken in 1997 yields final KTeV result:...
Fermilab experiment E773 has measured the phases ${\ensuremath{\Phi}}_{+\ensuremath{-}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}43.53}^{\ensuremath{\circ}}\ifmmode\pm\else\textpm\fi{}{0.97}^{\ensuremath{\circ}}$ and ${\ensuremath{\Phi}}_{00}\ensuremath{-}{\ensuremath{\Phi}}_{+\ensuremath{-}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.62}^{\ensuremath{\circ}}\ifmmode\pm\else\textpm\fi{}{1.03}^{\ensuremath{\circ}}$ of $\mathrm{CP}$ violating parameters...
The branching ratio of the rare decay ${\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ has been measured precisely, using complete data set from KTeV E799-II experiment at Fermilab. We observe 794 candidate events ${K}_{L}\ensuremath{\rightarrow}3{\ensuremath{\pi}}^{0}$ as a source tagged ${\ensuremath{\pi}}^{0}$s. expected background is $52.7\ifmmode\pm\else\textpm\fi{}11.2$ events, predominantly high ${e}^{+}{e}^{\ensuremath{-}}$ mass...
A very narrow resonance with a mass of 3.1 GeV/${\mathit{c}}^{2}$ is observed in the reaction $n+\mathrm{Be}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}+{\ensuremath{\mu}}^{\ensuremath{-}}+X$. The total cross section for this process, as well its ${{P}_{\ensuremath{\perp}}}^{2}$ and $x$ distribution, are given.
We have measured the production of $\ensuremath{\rho}+\ensuremath{\omega}$ and $J$ vector mesons, through their dimuon decay modes, by high-energy neutrons on nuclear targets at Fermilab. determined $A$ dependence to be ${A}^{0.62\ifmmode\pm\else\textpm\fi{}0.03}$ for $\ensuremath{\rho}+\ensuremath{\omega}$, ${A}^{0.93\ifmmode\pm\else\textpm\fi{}0.04}$ $J$, ${A}^{0.85\ifmmode\pm\else\textpm\fi{}0.05}$ continuum dimuons between masses.
A new beam line and detector were constructed to increase statistical precision greatly reduce systematic uncertainty on the ratio of CP-nonconserving parameters \ensuremath{\epsilon}'/\ensuremath{\epsilon}. Major improve- ments are discussed together with a result from first run: \ensuremath{\epsilon}'/\ensuremath{\epsilon}=0.0032\ifmmode\pm\else\textpm\fi{}0.0028 (statistical) \ifmmode\pm\else\textpm\fi{}0.0012 (systematic). The is better than earlier measurements yet still consistent...
The E731 experiment at Fermilab has searched for direct CP violation in K0→ππ, which is parametrized by ɛ'/ɛ. For the first time all four of KL,S→ππ modes were collected simultaneously, greatly facilitated studies systematic uncertainty. We find Re(ɛ'/ɛ)=-0.0004±0.0014(stat)±0.0006(syst). result provides no evidence violation.Received 18 December 1989DOI:https://doi.org/10.1103/PhysRevLett.64.1491©1990 American Physical Society
The Fermilab KTeV experiment has searched for lepton-flavor-violating decays of the KL meson in three decay modes. We observe no events signal region any modes studied, and we set following upper limits their branching ratios at 90% C.L.: BR(KL→π0μ±e∓)<7.6×10−11; BR(KL→π0π0μ±e∓)<1.7×10−10; BR(π0→μ±e∓)<3.6×10−10. This result represents a factor 82 improvement ratio limit KL→π0μ±e∓ is first reported KL→π0π0μ±e∓.Received 21 November 2007DOI:https://doi.org/10.1103/PhysRevLett.100.131803©2008...
We present new measurements of ${K}_{L}$ semileptonic form factors using data collected in 1997 by the KTeV (E832) experiment at Fermilab. The are based on $1.9\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{\mp}}\ensuremath{\nu}$ and $1.5\ifmmode\times\else\texttimes\fi{}{10}^{6}$...
We report the first observation of a manifestly CP violating effect in K(L)-->pi(+)pi(-)e(+)e(-) decay mode. A large asymmetry was observed distribution these decays CP-odd and T-odd angle straight phi between planes e(+)e(-) pi(+)pi(-) pairs K(L) center mass system. After acceptance corrections, overall is found to be [13.6+/-2. 5(stat)+/-1.2(syst)]%. This largest CP-violating yet when integrating over entire phase space mode such an angular variable.
We present a determination of the Cabibbo-Kobayashi-Maskawa parameter |V(us)| based on new measurements six largest K(L) branching fractions and semileptonic form factors by KTeV (E832) experiment at Fermilab. find |V(us)|=0.2252+/-0.0008(KTeV)+/-0.0021(ext), where errors are from external sources. also use measured to determine CP violation |eta(+-)|=(2.228+/-0.005(KTeV)+/-0.009(ext))x10(-3).
We report on a new measurement of the branching ratio B(KL→π0γγ) using KTeV detector. reconstruct 1982 events with an estimated background 608, that results in B(KL→π0γγ)=(1.29±0.03stat±0.05syst)×10−6. also measure parameter, aV, which characterizes strength vector meson exchange terms this decay. find aV=−0.31±0.05stat±0.07syst. These utilize full data set collected from 1997 to 2000 and supersede earlier measurements aV.1 MoreReceived 28 April...
We present new measurements of the six largest branching fractions ${K}_{L}$ using data collected in 1997 by KTeV experiment (E832) at Fermilab. The results are $B({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\mathrm{e}}^{\ensuremath{\mp}}\ensuremath{\nu})=0.4067\ifmmode\pm\else\textpm\fi{}0.0011$,...