R. M. Carey
A5075220046- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
Boston University
2001-2024
Yale University
1991
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...
We present the first results of Fermilab Muon g-2 Experiment for positive muon magnetic anomaly $a_\mu \equiv (g_\mu-2)/2$. The is determined from precision measurements two angular frequencies. Intensity variation high-energy positrons decays directly encodes difference frequency $\omega_a$ between spin-precession and cyclotron frequencies polarized muons in a storage ring. ring field measured using nuclear resonance probes calibrated terms equivalent proton spin precession...
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).
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.
We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, ω[over ˜]_{p}^{'}, anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From ratio...
The Muon g-2 Experiment at Fermi National Accelerator Laboratory (FNAL) has measured the muon anomalous precession frequency $ω_a$ to an uncertainty of 434 parts per billion (ppb), statistical, and 56 ppb, systematic, with data collected in four storage ring configurations during its first physics run 2018. When combined a precision measurement magnetic field experiment's ring, determines anomaly $a_μ({\rm FNAL}) = 116\,592\,040(54) \times 10^{-11}$ (0.46 ppm). This article describes...
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 Fermi National Accelerator Laboratory has measured the anomalous precession frequency $a^{}_\mu = (g^{}_\mu-2)/2$ of muon to a combined precision 0.46 parts per million with data collected during its first physics run in 2018. This paper documents measurement magnetic field storage ring. is monitored by nuclear resonance systems and calibrated terms equivalent proton spin spherical water sample at 34.7$^\circ$C. weighted distribution resulting $\tilde{\omega}'^{}_p$, denominator ratio...
We present details on a new measurement of the muon magnetic anomaly, $a_\mu = (g_\mu -2)/2$. The result is based positive data taken at Fermilab's Muon Campus during 2019 and 2020 accelerator runs. uses $3.1$ GeV$/c$ polarized muons stored in $7.1$-m-radius storage ring with $1.45$ T uniform field. value $ a_{\mu}$ determined from measured difference between spin precession frequency its cyclotron frequency. This normalized to strength field, using Nuclear Magnetic Resonance (NMR). ratio...
Received 22 August 2002DOI:https://doi.org/10.1103/PhysRevLett.89.129903©2002 American Physical Society
We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from Fermilab Muon $g\!-\!2$ Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, $\tilde{\omega}'^{}_p$, anomalous precession frequency corrected for beam dynamics effects,...
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 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.
This paper presents the beam dynamics systematic corrections and their uncertainties for Run-1 data set of Fermilab Muon g-2 Experiment. Two to measured muon precession frequency $\omega_a^m$ are associated with well-known effects owing use electrostatic quadrupole (ESQ) vertical focusing in storage ring. An average vertically oriented motional magnetic field is felt by relativistic muons passing transversely through radial electric components created ESQ system. The correction depends on...
The aim of the MuCap experiment is a 1% measurement singlet capture rate Lambda_S for basic electro-weak reaction mu + p -> n nu_mu. This observable sensitive to weak form-factors nucleon, in particular induced pseudoscalar coupling constant g_P. It will provide rigorous test theoretical predictions based on Standard Model and effective theories QCD. present method high precision lifetime measurements mu^- hydrogen gas comparison with free mu^+ lifetime. be performed ultra-clean,...
A new and improved experiment for measuring the muon magnetic anomaly at Brookhaven National Laboratory (BNL) was successfully started has yielded first results. New major components of include a superferric storage ring, superconducting inflector, electrostatic quadrupoles, lead-scintillating fiber electron calorimeters high precision NMR field measurement control system. The ratio R spin precession frequency positive relative to that free proton gives R=(3.707 219±0.000 048)×10−3. It is...