C. J. G. Onderwater
A5045449139- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Atomic and Molecular Physics
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Advanced NMR Techniques and Applications
- Muon and positron interactions and applications
- Advanced Frequency and Time Standards
- Stochastic processes and statistical mechanics
- Advanced Chemical Physics Studies
- Quantum, superfluid, helium dynamics
- Scientific Research and Discoveries
- Noncommutative and Quantum Gravity Theories
- Radioactive Decay and Measurement Techniques
National Institute for Subatomic Physics
2016-2025
Maastricht University
2023-2025
University of Groningen
2015-2024
Peking University
2020
Institute of High Energy Physics
2020
University of Chinese Academy of Sciences
2020
Tsinghua University
2020
State Key Laboratory of Nuclear Physics and Technology
2020
Central China Normal University
2014-2020
Centro Brasileiro de Pesquisas Físicas
2013-2019
We present the final report from a series of precision measurements muon anomalous magnetic moment, ${a}_{\ensuremath{\mu}}=(g\ensuremath{-}2)/2$. The details experimental method, apparatus, data taking, and analysis are summarized. Data obtained at Brookhaven National Laboratory, using nearly equal samples positive negative muons, were used to deduce ${a}_{\ensuremath{\mu}}(\mathrm{\text{Expt}})=11659208.0(5.4)(3.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$, where...
The anomalous magnetic moment of the negative muon has been measured to a precision 0.7 ppm (ppm) at Brookhaven Alternating Gradient Synchrotron. This result is based on data collected in 2001, and over an order magnitude more precise than previous measurement for muon. a(mu(-))=11 659 214(8)(3) x 10(-10) (0.7 ppm), where first uncertainty statistical second systematic, consistent with measurements anomaly positive average a(mu)(exp)=11 208(6) (0.5 ppm).
A precise measurement of the anomalous g value, a(mu) = (g-2)/2, for positive muon has been made at Brookhaven Alternating Gradient Synchrotron. The result a(mu+) 11 659 202(14) (6) x 10(-10) (1.3 ppm) is in good agreement with previous measurements and an error one third that combined data. current theoretical value from standard model a(mu)(SM) 159.6(6.7) (0.57 a(mu)(exp) - 43(16) which world average experimental value.
Three independent searches for an electric dipole moment (EDM) of the positive and negative muons have been performed, using spin precession data from muon g-2 storage ring at Brookhaven National Laboratory. Details on experimental apparatus three analyses are presented. Since individual results muon, as well combined result, d=-0.1(0.9)E-19 e-cm, all consistent with zero, we set a new EDM limit, |d| < 1.9E-19 e-cm (95% C.L.). This represents factor 5 improvement over previous best limit EDM.
This chapter of the report "Flavor in era LHC" Workshop discusses theoretical, phenomenological and experimental issues related to flavor phenomena charged lepton sector conserving CP-violating processes. We review current limits main theoretical models for structure fundamental particles. analyze consequences available data, setting constraints on explicit beyond standard model, presenting benchmarks discovery potential forthcoming measurements both at LHC low energy, exploring options...
A higher precision measurement of the anomalous g value, a(mu)=(g-2)/2, for positive muon has been made at Brookhaven Alternating Gradient Synchrotron, based on data collected in year 2000. The result a(mu(+))=11 659 204(7)(5)x10(-10) (0.7 ppm) is good agreement with previous measurements and an error about one-half that combined data. present world average experimental value a(mu)(expt)=11 203(8)x10(-10) ppm).
The Muon (g-2) Experiment, E989 at Fermilab, will measure the muon anomalous magnetic moment a factor-of-four more precisely than was done in E821 Brookhaven National Laboratory AGS. result appears to be greater Standard-Model prediction by three standard deviations. When combined with expected improvement hadronic contributions, should able determine definitively whether or not is evidence for physics beyond Standard Model. After review of motivation and basic technique, which use storage...
Received 22 August 2002DOI:https://doi.org/10.1103/PhysRevLett.89.129903©2002 American Physical Society
We report a measurement of the positive muon lifetime to precision 1.0 ppm; it is most precise particle ever measured. The experiment used time-structured, low-energy beam and segmented plastic scintillator array record more than 2×1012 decays. Two different stopping target configurations were employed in independent data-taking periods. combined results give τμ+(MuLan)=2 196 980.3(2.2) ps, 15 times as any previous experiment. gives value for Fermi constant: GF(MuLan)=1.166 378 8(7)×10−5...
We present a detailed report of the method, setup, analysis and results precision measurement positive muon lifetime. The experiment was conducted at Paul Scherrer Institute using time-structured, nearly 100%-polarized, surface beam segmented, fast-timing, plastic scintillator array. employed two target arrangements; magnetized ferromagnetic with ~4 kG internal magnetic field crystal quartz in 130 G external field. Approximately 1.6 x 10^{12} positrons were accumulated together data yield...
The spin precession frequency of muons stored in the $(g-2)$ storage ring has been analyzed for evidence Lorentz and CPT violation. Two violation signatures were searched for: a nonzero $\Delta\omega_{a}$ (=$\omega_{a}^{\mu^{+}}-\omega_{a}^{\mu^{-}}$); sidereal variation $\omega_{a}^{\mu^{\pm}}$. No significant effect is found, following limits on standard-model extension parameters are obtained: $b_{Z} =-(1.0 \pm 1.1)\times 10^{-23}$ GeV; $(m_{\mu}d_{Z0}+H_{XY}) = (1.8 6.0 \times 10^{-23})$...
The β decays of 12N and 12B have been studied at KVI JYFL to resolve the composition broad interfering 0+ 2+ strengths in triple-α continuum. For first time a complete treatment 3α decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has developed for description combination with recently published separate analysis angular correlations. We find that, addition Hoyle state 7.65 MeV, more than one needed reproduce spectra. Broad 0+3 2+2 states...
A new measurement of the positive muon's anomalous magnetic moment has been made at Brookhaven Alternating Gradient Synchrotron using direct injection polarized muons into superferric storage ring. The angular frequency difference ${\ensuremath{\omega}}_{a}$ between spin precession ${\ensuremath{\omega}}_{s}$ and orbital ${\ensuremath{\omega}}_{c}$ is measured as well free proton NMR ${\ensuremath{\omega}}_{p}.$ These determine...
The reaction 16O(e,e′pp)14C has been studied at a transferred four-momentum (ω,|q|)=(210MeV,300MeV/c). differential cross sections for the transitions to ground state and lowest excited states in 14C were determined as function of momentum recoiling nucleus angle between proton emitted forward direction transfer q. A comparison data results calculations, performed with microscopic model, shows clear signatures short-range correlations 16O state.Received 23 April...
The mean life of the positive muon has been measured to a precision 11 ppm using low-energy, pulsed beam stopped in ferromagnetic target, which was surrounded by scintillator detector array. result, tau(micro)=2.197 013(24) micros, is excellent agreement with previous world average. new average 019(21) micros determines Fermi constant G(F)=1.166 371(6)x10(-5) GeV-2 (5 ppm). Additionally, measurement positive-muon lifetime needed determine nucleon pseudoscalar coupling g(P).
The reaction ${}^{16}\mathrm{O}({e,e}^{\ensuremath{'}}\mathrm{pp})$ has been studied at a transferred four-momentum $(\ensuremath{\omega},|\mathbf{q}|)\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(210\mathrm{MeV},300\mathrm{MeV}/c)$. Evidence obtained for direct knockout of proton pairs from the 1p shell. excitation-energy spectrum residual nucleus and missing-momentum densities indicate that $^{1}S_{0}$ pair dominates reaction, while there is also noticeable contribution ${}^{3}P$ pairs.
As an important step toward atomic parity violation experiment in one single trapped Ra${}^{+}$ ion, laser spectroscopy on short-lived $^{212,213,214}\mathrm{Ra}$${}^{+}$ ions was conducted. The isotope shift of the $6 {}^{2}{D}_{3/2}$-$7 {}^{2}{P}_{1/2} $and {}^{2}{P}_{3/2} $transitions and hyperfine structure constants $7 {}^{2}{D}_{3/2} $states $^{213}\mathrm{Ra}$${}^{+}$ were measured, which provides a benchmark for required theory. A lower limit $232(4)$ ms {}^{2}{D}_{5/2} $state...