A. L. Lyon
A5057970957- 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
- Neutrino Physics Research
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Scientific Computing and Data Management
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Advanced Data Storage Technologies
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Medical Imaging Techniques and Applications
- Quantum Computing Algorithms and Architecture
- Parallel Computing and Optimization Techniques
- Quantum and electron transport phenomena
- Radioactive Decay and Measurement Techniques
- Geophysics and Gravity Measurements
- Noncommutative and Quantum Gravity Theories
Fermi National Accelerator Laboratory
2015-2024
The University of Texas Southwestern Medical Center
2024
Centro Brasileiro de Pesquisas Físicas
2005-2016
Universidade Federal do ABC
2010-2016
University of Science and Technology of China
2011-2016
Charles University
2010-2016
Institut National de Physique Nucléaire et de Physique des Particules
1999-2016
Universidad San Francisco de Quito
1999-2016
Centre National de la Recherche Scientifique
1999-2016
Czech Academy of Sciences
2016
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...
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
We report on a study of the invariant mass spectrum hadronic system in decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}}.$ This was performed with data obtained CLEO II detector operating at CESR ${e}^{+}{e}^{\ensuremath{-}}$ collider. present fits to phenomenological models which resonance parameters associated $\ensuremath{\rho}(770)$ and $\ensuremath{\rho}(1450)$ mesons are...
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.
In a sample of 19 million produced B mesons, we have observed the decays -> eta K* and improved our previous measurements eta'K. The branching fractions measure for these decay modes are BR(B+ K*+) = (26.4 +9.6-8.2 +- 3.3) x $10^{-6}$, BR(B0 K*0) (13.8 +5.5-4.6 1.6) eta' K+) (80 +10-9 7) $10^{-6}$ K0) (89 +18-16 9) $10^{-6}$. We searched with comparable sensitivity related report upper limits fractions.
We search for CP-violating charge asymmetries (alpha(CP)) in the B meson decays to K(+/-)pi(-/+), K(+/-)pi(0), K(0)(S)pi(+/-), K(+/-)eta('), and omega pi(+/-). Using 9.66 million upsilon(4S) collected with CLEO detector, statistical precision on alpha(CP) is range of +/-0.12 +/-0.25 depending decay mode. While up +/-0.5 are possible within standard model, measured consistent zero all five modes studied.
We have studied charmless hadronic decays of $B$ mesons into two-body final states with kaons and pions observe three new processes the following branching fractions: $B(B\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({4.3}_{\ensuremath{-}1.4}^{+1.6}\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$,...
We have measured the first and second moments of hadronic mass-squared distribution in B-->X(c)l nu, for P(lepton)>1.5 GeV/c. find <M(2)(X)-M macro(2)(D)> = 0.251+/-0.066 GeV(2), <(M(2)(X)-<M(2)(X)>)(2)> 0.576+/-0.170 GeV(4), where M macro(D) is spin-averaged D meson mass. From that moment photon energy spectrum b-->s gamma, we heavy quark effective theory parameter lambda(1) (in modified minimal subtraction renormalization scheme, to order 1/M(3)(B) beta(0)alpha(2)(s)) be -0.24+/-0.11...
We report on determinations of |Vub| resulting from studies the branching fraction and q^2 distributions in exclusive semileptonic B decays that proceed via b->u transition. Our data set consists 9.7x10^6 BBbar meson pairs collected at Y(4S) resonance with CLEO II detector. measure B(B0 -> pi- l+ nu) = (1.33 +- 0.18 0.11 0.01 0.07)x10^{-4} rho- (2.17 0.34 +0.47/-0.54 0.41 0.01)x10^{-4}, where errors are statistical, experimental systematic, systematic due to residual form-factor...
The resonant structure of the four pion final state in decay →τ3ππ0ντ has been analyzed using 4.27 million τ+τ− pairs collected by CLEO II experiment at Cornell Electron Storage Ring. A partial wave analysis performed; spectral decomposition system is dominated ωπ and a1π states. mass width ρ′ resonance have extracted from a fit to →τωπντ function. We searched for second class currents spin-parity established an upper limit on non-vector current contribution.Received 30 September...
Quantum information science harnesses the principles of quantum mechanics to realize computational algorithms with complexities vastly intractable by current computer platforms. Typical applications range from chemistry optimization problems and also include simulations for high energy physics. The recent maturing hardware has triggered preliminary explorations several institutions (including Fermilab) capable demonstrating advantage in multiple domains, computing communications, sensing....
We present an update of the search for lepton family number violating decay $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}\ensuremath{\mu}\ensuremath{\gamma}$ using 12.6 million ${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ pairs collected with CLEO detector. No evidence a signal has been found and corresponding upper limit is...
In a sample of $9.66\times 10^6 B\bar{B}$ pairs collected with the CLEO detector we make first observation B decays to an $\eta_c$ and kaon. We measure branching fractions $BR(B^+\to\eta_c K^+) = (0.69 + 0.26 - 0.21 +- 0.08 0.20)\times 10^{-3}$ $BR(B^0\to\eta_c K^0) (1.09 0.55 0.42 0.12 0.31)\times 10^{-3}$, where error is statistical, second systematic third from fraction uncertainty. From these extract decay constant in factorization approximation, $f_{\eta_c} 335 75$ MeV. also search for...
An experiment to synthesize element 110 by the Co59+209Bi reaction has been performed at SuperHILAC Lawrence Berkeley Laboratory. One event with many of expected characteristics a successful synthesis 110267 was observed. This corresponds production cross section about one picobarn.Received 22 November 1994DOI:https://doi.org/10.1103/PhysRevC.51.R2293©1995 American Physical Society
We have searched for two-body charmless decays of B mesons to purely hadronic exclusive final states including $\omega$ or $\phi$ using data collected with the CLEO II detector. With this sample $6.6 \times 10^6$ we observe a signal $\omega K^+$ state, and measure branching fraction B($B^+ \to \omega K^+$) = 1.5 +0.7 -0.6 +-0.2 $\times 10^{-5}$. also some evidence $\phi K^*$ upper limits are given 22 other decay modes. These results provide opportunity studies theoretical models physical parameters.
We report the first observation of $B\to \eta' X$ transitions with high momentum $\eta'$ mesons. observe $39.0\pm 11.6$ B decay events $2.0< p_{\eta'} < 2.7$ GeV/c, region where background from $b\to c$ processes is suppressed. discuss physical interpretation signal, including possibility that it due to s g^*$ transitions. Given interpretation, we find ${\cal B}(B\to X_s) = (6.2 \pm 1.6(stat) 1.3(sys)^{+0.0}_{-1.5}(bkg))\times 10^{-4} $ for $2.0<p_{\eta'}<2.7$ GeV/c.
The anomalous magnetic moment of the muon is one most precisely measured quantities in experimental particle physics. Its latest measurement at Brookhaven National Laboratory deviates from Standard Model expectation by approximately 3.5 standard deviations. goal new experiment, E989, now under construction Fermilab, a fourfold improvement precision. Here, we discuss details future and its current status.
We report the first observation of exclusive decays type B-->D(*)N_NX, where N is a nucleon. Using sample 9.7x10(6)B_B pairs collected with CLEO detector operating at Cornell Electron Storage Ring, we measure branching fractions B(B0-->D(*-)p_p pi(+)) = (6.5(+1.3)(-1.2)+/-1.0)x10(-4) and B(B0-->D(*-)p_n) (14.5(+3.4)(-3.0)+/-2.7)x10(-4). Antineutrons are identified by their annihilation in CsI electromagnetic calorimeter.
Using a sample of 4.7/fb integrated luminosity accumulated with the CLEO-II detector at Cornell Electron Storage Ring (CESR), we have measured branching fractions tau lepton into $K^- h^+ \pi^- \nu_\tau$ and K^+ relative to $h^- h^- \nu_\tau; K^- \pi^0\nu_\tau$ \pi^0 \nu_\tau$. The are: (5.16+-0.20+-0.50)*$10^{-2}$, (1.52+-0.14+-0.29)*$10^{-2}$, (2.54+-0.44+-0.39)*$10^{-2}$ $<0.0154$ 95% C.L., respectively. Coupled additional experimental information, use our results extract information on...
We have observed the decay ${B}^{+}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{+}$, using $3.3\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected with CLEO II detector at Cornell Electron Storage Ring. find ratio of branching fractions...
We report on a search for charmless hadronic B decays to the three-body final states K(0)(S)h(+)pi(-), K(+)h(-)pi(0), K(0)(S)h(+)pi(0) (h(+/-) denotes charged pion or kaon), and their charge conjugates, using 13.5 fb(-1) of integrated luminosity produced near sqrt[s]=10.6 GeV, collected with CLEO detector. observe decay B-->K0pi(+)pi(-) branching fraction (50(+10)(-9)(stat.)+/-7(syst.))x10(-6) B-->K(*+)(892)pi(-) (16(+6)(-5)(stat.)+/-2(syst.))x10(-6).
Using data collected by the CLEO detector in Upsilon(4S) region, we report new measurements of exclusive decays B mesons into final states type Lambda_c^+ p-bar n(pi), where n=0,1,2,3. We find signals modes with one, two and three pions an upper limit for body decay pbar. also make first to Sigma_c n=0,1,2. one p-bar. Measurements these shed light on mechanisms involved baryons.