A5086048639- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Plasma Diagnostics and Applications
- Atomic and Molecular Physics
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Advanced Fiber Laser Technologies
- Advanced NMR Techniques and Applications
- Magnetic confinement fusion research
- Semiconductor Lasers and Optical Devices
Kyoto University
2010-2024
High Energy Accelerator Research Organization
2015-2024
Brookhaven National Laboratory
2011-2024
RIKEN Nishina Center
2010-2024
Banaras Hindu University
2007-2024
The University of Tokyo
2006-2024
Augustana University
2014-2024
Bhabha Atomic Research Centre
2022-2024
RIKEN
2003-2023
Abilene Christian University
2003-2023
This paper introduces a new approach to measure the muon magnetic moment anomaly |$a_{\mu} = (g-2)/2$| and electric dipole (EDM) |$d_{\mu}$| at J-PARC facility. The goal of our experiment is |$a_{\mu}$| using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing |$g-2$| experiments unprecedented quality storage field. Additional significant differences from present experimental include 1000 transverse emittance beam...
Colliding beams of 70% polarized protons at up to $\sqrt{s}$=500 GeV, with high luminosity, L=2$\times10^{\rm 32}$ cm$^{-2}$sec$^{-1}$, will represent a new and unique laboratory for studying the proton. RHIC-Spin be first polarized-proton collider capable copious production jets, directly produced photons, $W$ $Z$ bosons. Features include direct precise measurements polarization gluons $\bar{u}$, $\bar{d}$, $u$, $d$ quarks in Parity violation searches physics beyond standard model...
Polarized parton distribution functions are determined by using world data from the longitudinally polarized deep inelastic scattering experiments. A new parametrization of is adopted taking into account positivity and counting rule. From fit to asymmetry A_1, u d valence quarks, sea gluon obtained. The results indicate that quark spin content \Delta\Sigma=0.20 0.05 in leading order (LO) next-to-leading-order (NLO) MS-bar scheme, respectively. However, if x dependence sea-quark fixed at...
Cascade hypernuclei have been studied in the (K−,K+) reaction on a scintillating fiber target. The experimental result is compared with theoretical calculation order to extract information concerning Ξ− nucleus potential.Received 9 April 1998DOI:https://doi.org/10.1103/PhysRevC.58.1306©1998 American Physical Society
The analyzing power AN in inclusive π− and π+ production has been measured with a 200 GeV/c transversely polarized antiproton beam over wide xF range (0.2≤xF≤0.9) at moderate pT (0.2≤pT≤1.5GeV/c). asymmetry increases increasing from zero to large positive values for π−'s, decreases negative π+'s. A threshold the onset of is observed about pT∼0.5GeV/c, below which essentially above (decreases) π−'s ( π+'s) covered range.Received 17 April...
Differential cross sections for γp→K+Λ(1405) and γp→K+Σ0(1385) reactions have been measured in the photon energy range from 1.5 to 2.4 GeV angular of 0.8<cos(Θ)<1.0 K+ scattering angle center-of-mass system. This data is first measurement Λ(1405) photoproduction section. The line shapes Σ+π− Σ−π+ decay modes were different with each other, indicating a strong interference isospin 0 1 terms Σπ amplitudes. ratios production Σ0(1385) two ranges: near threshold (1.5<Eγ<2.0 GeV) far it...
We investigate polarized parton distribution functions (PDFs) and their uncertainties by using world data on the spin asymmetry ${A}_{1}.$ The of PDFs are estimated Hessian method. up down valence-quark distributions determined well. However, antiquark have large at this stage, it is particularly difficult to fix gluon distribution. ${\ensuremath{\chi}}^{2}$ analysis produces a positively distribution, but even $\ensuremath{\Delta}g(x)=0$ could be allowed according our uncertainty...
The H-dibaryon resonance was sought by a ΛΛ invariant mass spectrum that obtained the C12 (K−,K+ΛΛX) reactions. We observed bump near threshold, as reported previous experiment (KEK E224), with better statistics. Data were compared results of cascade model calculation including final state interactions consistent newly measured binding energy ΛΛ6He. No significant enhancements above levels predictions observed. resulting upper limit for production cross section H range between and ΞN...
Emission of muonium (|$\mu ^+e^-$|) atoms from a laser-processed aerogel surface into vacuum was studied for the first time. Laser ablation used to create hole-like regions with diameter about 270 |$\mu $|m in triangular pattern hole separation range 300–500 $|m. The emission probability sample is at least eight times higher than uniform one.
A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It near-ideal two-body system for precision test bound-state theory fundamental symmetries. The MuSEUM collaboration performed new measurement the muonium ground-state hyperfine structure at J-PARC using high-intensity pulsed beam high-rate capable positron counter. resonance transition was successfully observed near-zero magnetic field, interval $ν_{\text{HFS}}$ = 4.463302(4) GHz obtained with relative...
As a new method to determine the resonance frequency, Rabi-oscillation spectroscopy has been developed. In contrast conventional which draws curve, fits time evolution of Rabi oscillation. By selecting optimized it is shown that precision twice as good with frequency sweep. Furthermore, data under different conditions can be treated in unified manner, allowing more efficient measurements for systems consisting limited number short-lived particles produced by accelerators such muons. We have...
The analyzing powers of ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ were measured using an incident $22\ensuremath{-}\mathrm{GeV}/c$ transversely polarized proton beam at the Brookhaven Alternating Gradient Synchrotron. A magnetic spectrometer ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ inclusive asymmetries on a hydrogen carbon target. An elastic polarimeter with ${\mathrm{CH}}_{2}$ target pp elastic-scattering to determine polarization published data for...
Global analysis has been performed within the next-to-leading order in quantum chromodynamics (QCD) to determine polarized parton distributions with new experimental data spin asymmetries. The set includes J-Lab, HERMES, and COMPASS measurements on asymmetry ${A}_{1}$ for neutron deuteron lepton scattering. Our also utilizes double-spin ${\ensuremath{\pi}}^{0}$ production $pp$ collisions, ${A}_{LL}^{{\ensuremath{\pi}}^{0}}$, measured by PHENIX Collaboration. Because of these data,...
We report the first measurements of A_N absolute value and shape in -t range from 0.0015 to 0.010GeV/c^2 with a precision better than 0.005 for each data point using polarized atomic hydrogen gas jet target 100 GeV RHIC proton beam.
We developed a new positron detector system called Kalliope, which is based on multi-pixel avalanch photo-diode (m-APD), application specific integrated circuit (ASIC), field programmable gated array (FPGA) and ethernet-based SiTCP data transfer technology. have manufactured general-purpose spectrometer for muon spin relaxation (μSR) measurements, employing 40 Kalliope units (1280 channels of scintillators) installed in 0.4 T longitudinal-field magnet. The has been placed at D1 experimental...
An Nd:YAG laser-based sodium temperature/wind lidar was developed for the measurement of northern polar mesosphere and lower thermosphere at Tromsø (69.6N, 19.2E), Norway. Coherent light 589 nm is produced by sum frequency generation 1064 1319 from two diode laser end-pumped pulsed lasers. The output power as high 4W, with 4 mJ/pulse 1000 Hz repetition rate. Five tilting Cassegrain telescopes enable us to make five-direction (zenith, north, south, east, west) observation temperature wind...
We have developed an interdigital H-mode (IH) drift-tube linac (DTL) design with alternative phase focusing (APF) scheme for a muon linac, in order to measure the anomalous magnetic moment and electric dipole (EDM) of muons at Japan Proton Accelerator Research Complex (J-PARC). The IH-DTL accelerates from $\ensuremath{\beta}=v/c=0.08$ 0.28 operational frequency 324 MHz. output beam emittances are calculated as $0.315\ensuremath{\pi}$ $0.195\ensuremath{\pi}\text{ }\text{ }\mathrm{mm}\text{...