A5114377319- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Physics and Engineering Research Articles
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Engineering and Materials Science Studies
- Biomedical and Chemical Research
- Gyrotron and Vacuum Electronics Research
- Electron and X-Ray Spectroscopy Techniques
- Elasticity and Material Modeling
- Nuclear Physics and Applications
- Experimental and Theoretical Physics Studies
- Radiation Detection and Scintillator Technologies
- Quantum Mechanics and Applications
Carnegie Mellon University
2013-2023
Institute of High Energy Physics
2010-2019
SLAC National Accelerator Laboratory
1987-2017
Massachusetts Institute of Technology
1991-2017
Max Planck Institute for Physics
1981-2017
Northwestern University
2017
University of Minnesota
2005-2017
Menlo School
2017
University of Colorado Boulder
2014-2016
California Institute of Technology
1985-2015
Using 13.5 ${\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected with the CLEO II detector, we have observed a narrow resonance decaying to ${D}_{s}^{*+}{\ensuremath{\pi}}^{0}$ mass near $2.46\mathrm{GeV}{/c}^{2}.$ The search for such state was motivated by recent discovery BaBar Collaboration at $2.32\mathrm{GeV}{/c}^{2},$ ${D}_{\mathrm{sJ}}^{*}{(2317)}^{+},$ that decays ${D}_{s}^{+}{\ensuremath{\pi}}^{0}.$ Reconstructing...
We have measured the branching fraction and photon energy spectrum for radiative penguin process b-->s gamma. find Beta(b-->s gamma) = (3.21+/-0.43+/-0.27(+0.18)(-0.10))x10(-4), where errors are statistical, systematic, from theory corrections. obtain first second moments of above 2.0 GeV, <E( gamma)> 2.346+/-0.032+/-0.011 <E(2)(gamma)>-<E(gamma)>(2) 0.0226+/-0.0066+/-0.0020 GeV(2), statistical systematic. From moment, we (in modified minimal subtraction renormalization scheme, to order...
Using data collected with the CLEO detector operating at CESR e+e- collider sqrt[s]=3.97-4.26 GeV, we investigate 15 charmonium decay modes of psi(4040), psi(4160), and Y(4260) resonances. We confirm, 11 sigma significance, BABAR Y(4260)-->pi+pi- J/psi discovery, make first observation Y(4260)--> pi(0)pi(0) (5.1 sigma), find evidence for Y(4260)-->K+K- J/psi(3.7 sigma). measure cross sections sqrt[s]=4.26 GeV as sigma(pi+pi- J/psi)=58(+12)(-10)+/-4 pb, sigma(pi(0)pi(0) J/psi)=23(+12)(-8)+/-1...
Using $13.3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data taken in the $\ensuremath{\Upsilon}(1S\ensuremath{-}4S)$ region with CLEO III detector at CESR collider, a search has been made for new resonance $Y(4260)$ recently reported by BABAR Collaboration. The production initial state radiation (ISR), and its decay into ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$, are confirmed. A good quality fit to our is...
The reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ has been analyzed using 97 ${\mathrm{pb}}^{\ensuremath{-}1}$ of data taken with the Crystal Ball detector at DESY ${e}^{\ensuremath{-}}{e}^{+}$ storage ring DORIS II beam energies around 5.3 GeV. For first time we have measured cross section for $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$...
We report the first determination of relative strong-phase difference between D^0 -> K^0_S,L K^+ K^- and D^0-bar K^-. In addition, we present updated measurements pi^+ pi^- pi^-. Both exploit quantum coherence a pair mesons produced from psi(3770) decays. The differences measured are important for determining Cabibbo-Kobayashi-Maskawa angle gamma/phi_3 in B^- D^0-tilde decays, where is or meson decaying to K^0_S h^+ h^- (h=pi,K), manner independent model assumed describe decay. Using our...
We present the first measurement of D*+ width using 9/fb e+ e- data collected near Upsilon(4S) resonance by CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction that takes advantage small vertical size CESR beam spot to measure energy release distribution from -> D0 pi+ decay. find Gamma(D*+) = 96 +- 4 (Statistical) 22 (Systematic) keV. also in decay compute Delta m m(D*+) - m(D0) 145.412 0.002 0.012 MeV/c^2
Using the entire CLEO-c \psi(3770)-> D\bar{D} event sample, corresponding to an integrated luminosity of $818 pb^-1 and approximately 5.4 million events, we present a study decays D^0 -> \pi^- e^+ \nu_e, K^- D^+ \pi^0 \bar{K}^0 \nu_e. Via tagged analysis technique, in which one D is fully reconstructed hadronic mode, partial rates for semileptonic by other are measured several q^2 bins. We fit these using form factor parameterizations report results, including shape parameters branching...
We extract a relatively precise value for the decay constant of ${D}^{+}$ meson by measuring $\mathcal{B}({D}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\nu})=(4.40\ifmmode\pm\else\textpm\fi{}{0.66}_{\ensuremath{-}0.12}^{+0.09})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ using $281\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ data taken on $\ensuremath{\psi}(3770)$ resonance with CLEO-$c$ detector. find...
Using $20.7\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data taken at $\sqrt{s}=3.671\text{ }\mathrm{GeV}$ with the $\mathrm{CLEO}\mathrm{\text{\ensuremath{-}}}c$ detector, precision measurements electromagnetic form factors charged pion, kaon, and proton have been made for timelike momentum transfer $|{Q}^{2}|=13.48\text{ }{\mathrm{GeV}}^{2}$ by reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}^{+}{h}^{\ensuremath{-}}$. The...
Using $281\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collisions recorded at the $\ensuremath{\psi}(3770)$ resonance with CLEO-c detector CESR (Cornell Electron Storage Ring), we determine absolute hadronic branching fractions charged and neutral $D$ mesons using a double tag technique. Among measurements for three ${D}^{0}$ six ${D}^{+}$ modes, obtain reference...
Using 13.5 inverse fb of e+e- annihilation data collected with the CLEO II detector we have observed a narrow resonance in Ds*+pi0 final state, mass near 2.46 GeV. The search for such state was motivated by recent discovery BaBar Collaboration at 2.32 GeV, DsJ*(2317)+ that decays to Ds+pi0. Reconstructing Ds+pi0 and states data, observe peaks both corresponding reconstructed difference distributions, dM(Dspi0)=M(Dspi0)-M(Ds) dM(Ds*pi0)=M(Ds*pi0)-M(Ds*), them values 350 MeV. We interpret...
Using the CLEO-c detector at Cornell Electron Storage Ring, we have measured inclusive and exclusive cross sections for production of D+, D0 Ds+ mesons in e+e- annihilations thirteen center-of-mass energies between 3.97 4.26 GeV. Exclusive are presented final states consisting two charm (DD, D*D, D*D*, Ds+Ds-, Ds*+Ds-, Ds*+Ds*-) processes which charm-meson pair is accompanied by a pion. No enhancement any state observed energy Y(4260).
We measure the branching ratio of purely leptonic decay D+ meson with unprecedented precision as B(D+ -> mu+ nu) = (3.82 +/- 0.32 0.09)x10^(-4), using 818/pb data taken on psi(3770) resonance CLEO-c detector at CESR collider. use this determination to derive a value for pseudoscalar constant fD+, combining measurements lifetime and assuming |Vcd| |Vus|. find fD+ (205.8 8.5 2.5) MeV. The rate asymmetry [B(D+ nu)-B(D- mu- nu)]/[B(D+ nu)+B(D- nu)] 0.08 0.08, consistent no CP violation. also set...
Neutrinos propagating in media (matter and electromagnetic fields) undergo flavor helicity oscillations, where transitions are instigated both by fields matter currents. In addition, it has been shown that correlations between neutrinos antineutrinos of opposite momentum can build up anisotropic media. We rederive the neutrino equations motion mean-field approximation for homogeneous yet media, confirming previous results except a small correction Majorana case. Furthermore, we derive...
We use data collected with the CLEO II detector to perform a high-statistics measurement of resonant substructure in ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ decays. find that Dalitz plot is well represented by combination seven quasi-two-body decay channels...
We present the first measurement of D*(+) width using 9/fb e(+)e(-) data collected near Upsilon(4S) resonance by CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction that takes advantage small vertical size Cornell Electron-positron Storage Ring beam spot to measure energy release distribution from D*(+)-->D(0)pi(+) decay. find gamma(D*(+)) = 96+/-4 (stat)+/-22 (syst) keV. also in decay compute Delta m identical with m(D*(+))-m(D(0)) 145.412+/-0.002...
In e(+)e(-) collisions using the CLEO detector, we have studied decay of D0 to final state K(0)(S)pi(+)pi(-) with initial flavor tagged by D(*+)-->D0pi(+). We use Dalitz technique measure resonant substructure in this and clearly observe ten different contributions fitting for their amplitudes relative phases. a K(*)(892)(+)pi(-) component which arises from doubly Cabibbo suppressed decays or D0-D0; mixing.
We report on the observation of ηc′(2S01), radial excitation ηc(1S01) ground state charmonium, in two-photon fusion reaction γγ→ηc′→KS0K±π∓ 13.6 fb−1 CLEO II/II.V data and 13.1 III data. obtain M(ηc′)=3642.9±3.1(stat)±1.5(syst) MeV M(ηc)=2981.8±1.3(stat)±1.5(syst) MeV. The corresponding values hyperfine splittings between S01 S13 states are ΔMhf(1S)=115.1±2.0 ΔMhf(2S)=43.1±3.4 Assuming that ηc ηc′ have equal branching fractions to KSKπ, we Γγγ(ηc′)=1.3±0.6 keV.Received 23 December...
Using $55.8\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collisions recorded at the $\ensuremath{\psi}(3770)$ resonance with CLEO-c detector CESR, we determine absolute hadronic branching fractions charged and neutral $D$ mesons using a double tag technique. Among measurements for three ${D}^{0}$ six ${D}^{+}$ modes, obtain reference...
Using 2.45x10;{7} psi(2S) decays collected with the CLEO-c detector at Cornell Electron Storage Ring we present most precise measurements of magnetic dipole transitions in charmonium system. We measure B(psi(2S)-->gammaeta_{c})=(4.32+/-0.16+/-0.60)x10;{-3}, B(J/psi-->gammaeta_{c})/B(psi(2S)-->gammaeta_{c})=4.59+/-0.23+/-0.64, and B(J/psi-->gammaeta_{c})=(1.98+/-0.09+/-0.30)%. observe a distortion eta_{c} line shape due to photon-energy dependence transition rate. find that mass are sensitive...