A5034200514- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Muon and positron interactions and applications
- Neutrino Physics Research
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Archaeological Research and Protection
- Agriculture, Water, and Health
- Atomic and Molecular Physics
- Black Holes and Theoretical Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear physics research studies
- Indigenous Studies and Ecology
- Radiation Detection and Scintillator Technologies
- Advanced NMR Techniques and Applications
- Scientific Research and Discoveries
- Geomagnetism and Paleomagnetism Studies
- Astrophysics and Cosmic Phenomena
- Noncommutative and Quantum Gravity Theories
Boston University
2007-2024
University of California, Los Angeles
1981-2020
Planetary Science Institute
2020
Rutgers, The State University of New Jersey
2003-2013
State University of New York at Oswego
2003-2013
University of Stirling
1981-2013
University of Birmingham
1981-2013
University of Virginia
1981-2013
University of Wisconsin–Madison
1981-2013
Cambridge University Press
1981-2013
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.
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).
A new highly sensitive method of looking for electric dipole moments charged particles in storage rings is described. The major systematic errors inherent the are addressed and ways to minimize them suggested. It seems possible measure muon EDM levels that test speculative theories beyond standard model.
The cross-section of the process e+e−→π+π− has been measured using about 11 4000 events collected by CMD-2 detector at VEPP-2M e+e− collider in center-of-mass energy range from 0.61 to 0.96 GeV. Results pion form factor determination with a 0.6% systematic uncertainty are presented. following values ρ- and ω-meson parameters were found: Mρ=(776.09±0.81) MeV, Γρ=(144.46±1.55) Γ(ρ→e+e−)=(6.86±0.12) keV, Br(ω→π+π−)=(1.33±0.25)%. Implications for hadronic contribution muon anomalous magnetic...
An application of intensity interferometry to relativistic heavy ion collisions is reported. The correlation between two like-charged pions used study the reactions $\mathrm{A}\mathrm{r}+\mathrm{K}\mathrm{C}\mathrm{l}\ensuremath{\rightarrow}{2\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}+X$ and $\mathrm{N}\mathrm{e}+\mathrm{N}\mathrm{a}\mathrm{F}\ensuremath{\rightarrow}{2\ensuremath{\pi}}^{\ensuremath{-}}+X$, both at an incident beam energy $1.8A$ GeV. Source sizes lifetimes are measured...
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 proton Compton effect has been studied in the region between threshold for pion photoproduction and \ensuremath{\Delta}(1232). measurements were performed using bremmstrahlung from high duty-factor electron beam available at Saskatchewan Accelerator Laboratory. Elastically scattered photons detected with an energy resolution of approximately 1.5% a large NaI total absorption scintillation detector. Differential cross sections measured photon energies range 136...
We review the status of major experiments that are searching for charged lepton flavor violation. present and discuss recent results prospects future projects in framework theories beyond Standard Model.
The muon anomalous magnetic moment has been measured in a new experiment at Brookhaven. Polarized muons were stored superferric ring, and the angular frequency difference, ${\ensuremath{\omega}}_{a}$, between spin precession orbital frequencies was determined by measuring time distribution of high-energy decay positrons. ratio $R$ ${\ensuremath{\omega}}_{a}$ to Larmor free protons, ${\ensuremath{\omega}}_{p}$, storage-ring field measured. We find...
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 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).
Results of the measurement φ meson parameters with general purpose detector CMD-2 at upgraded e+e− collider VEPP-2M Novosibirsk are presented. This is first four major decay modes in a single experiment. The results based on about 55,600 identified hadronic events consistent previous measurements, and have precision comparable to current world average.
Charged-lepton flavour-violating (cLFV) processes offer deep probes for new physics with discovery sensitivity to a broad array of models - SUSY, Higgs Doublets, Extra Dimensions, and, particularly, explaining the neutrino mass hierarchy and matter-antimatter asymmetry universe via leptogenesis. The most sensitive cLFV utilize high-intensity muon beams search $μ\rightarrow e$ transitions. We summarize status muon-cLFV experiments currently under construction at PSI, Fermilab, J-PARC. These...