A5053550854- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Muon and positron interactions and applications
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Noncommutative and Quantum Gravity Theories
- Black Holes and Theoretical Physics
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
Hankou University
2021
Nanjing University
2021
University of Minnesota
2002-2009
University of Minnesota System
2002-2008
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).
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).
Received 22 August 2002DOI:https://doi.org/10.1103/PhysRevLett.89.129903©2002 American Physical Society
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; $(m_{\mu}d_{Z0}+H_{XY}) = (1.8 6.0 \times 10^{-23})$...
Two signals of CPT/Lorentz violation have been searched for in data collected the muon (9-2) experiment E821 at Brookhaven Lab AGS. Muons 3.1 GeV/c were stored a magnetic storage ring, and their spin precession frequency wa relative to momentum was measured. The difference average frequencies p+ prestricts Standard-Model Extension parameter b Z . non-observation sidereal variation over severalmonth collection period restricts parameters b: *
In this paper, we investigate gravitational waves (GWs) from the axionlike particle inflation by applying multinature model. The model parameter $n$ determines exit way of inflation, number phase transitions (PTs), and multiples inflation. with PTs, there is a lower bound for to reach corresponding but magnitude negligible physical observations, such as ${n}_{s}$, $r$, ${\mathrm{\ensuremath{\Omega}}}_{\mathrm{GW}}{h}^{2}$. GWs can be generated in two ways one derives quantum fluctuations,...
The muon (g 2) experiment E821 is currently in progress at Brookhaven National Laboratory. Four data-taking runs for positive muons and one run negative were successfully accomplished 19972000 2001, respectively. Results of the have been published, thus completing our µ + . Data analysis 2001 progress. To provide measurement a = ½(g same level accuracy as +, we would need more run. PACS Nos.: 31.15Pf, 31.30Jv, 32.10Hq