M. Kargiantoulakis
A5060608343- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- Particle Detector Development and Performance
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Crystallography and Radiation Phenomena
- Electron and X-Ray Spectroscopy Techniques
- High-Energy Particle Collisions Research
- Advanced Electron Microscopy Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Scientific Research and Discoveries
- Astrophysics and Cosmic Phenomena
- Cardiac Imaging and Diagnostics
- Atomic and Subatomic Physics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Cardiac electrophysiology and arrhythmias
- Photocathodes and Microchannel Plates
- Advanced NMR Techniques and Applications
- ECG Monitoring and Analysis
Fermi National Accelerator Laboratory
2018-2024
University of Virginia
2013-2022
Korea Advanced Institute of Science and Technology
2019
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...
The Q(weak) experiment has measured the parity-violating asymmetry in ep elastic scattering at Q(2)=0.025(GeV/c)(2), employing 145 μA of 89% longitudinally polarized electrons on a 34.4 cm long liquid hydrogen target Jefferson Lab. results experiment's commissioning run, constituting approximately 4% data collected experiment, are reported here. From these initial results, is A(ep)=-279±35 (stat) ± 31 (syst) ppb, which smallest and most precise ever scattering. small Q(2) this made possible...
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...
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,...
We report the first measurement of parity-violating elastic electron scattering asymmetry on ^{27}Al. The ^{27}Al is A_{PV}=2.16±0.11(stat)±0.16(syst) ppm, and was measured at ⟨Q^{2}⟩=0.02357±0.00010 GeV^{2}, ⟨θ_{lab}⟩=7.61°±0.02°, ⟨E_{lab}⟩=1.157 GeV with Q_{weak} apparatus Jefferson Lab. Predictions using a simple Born approximation as well more sophisticated distorted-wave calculations are in good agreement this result. From neutron radius R_{n}=2.89±0.12 fm determined many-models...
We propose an evolution of the Mu2e experiment, called Mu2e-II, that would leverage advances in detector technology and utilize increased proton intensity provided by Fermilab PIP-II upgrade to improve sensitivity for neutrinoless muon-to-electron conversion one order magnitude beyond providing deepest probe charged lepton flavor violation foreseeable future. Mu2e-II will use as much infrastructure possible, providing, where required, improvements apparatus accommodate beam cope with...
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...
A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to imaginary part two-photon exchange process. We report a 2% precision measurement elastic electron-proton with mean angle θ_{lab}=7.9° and energy 1.149 GeV. The result B_{n}=-5.194±0.067(stat)±0.082 (syst) ppm. This most precise this quantity available date therefore provides stringent test models at far-forward angles (θ_{lab}→0) where they...
An observation of Charged Lepton Flavor Violation (CLFV) would be unambiguous evidence for physics beyond the Standard Model. The Mu2e and COMET experiments, under construction, are designed to push sensitivity CLFV in mu e conversion process unprecedented levels. Whether is observed or not, there a strong case made further improving sensitivity, examining on additional target materials. Mu2e-II proposed upgrade Mu2e, with at least an order magnitude rate over Mu2e. approach challenges this...
We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries ${B}_{n}$ on $^{12}\mathrm{C}$ and $^{27}\mathrm{Al}$, obtained with an electron beam polarized transverse to its momentum direction. These add additional kinematic point a series previous provide first measurement $^{27}\mathrm{Al}$. The experiment utilized ${\mathrm{Q}}_{\mathrm{weak}}$ apparatus at Jefferson Lab energy 1.158 GeV. average laboratory angle for both targets was...
We report the measurement of parity-violating asymmetry for inelastic scattering electrons from proton, at $Q^2 = 0.082$ GeV$^2$ and $ W 2.23$ GeV, above resonance region. The result $A_{\rm Inel} - 13.5 \pm 2.0 ({\rm stat}) 3.9 syst})$~ppm agrees with theoretical calculations, helps to validate modeling $\gamma Z$ interference structure functions $F_1^{\gamma Z}$ $F_2^{\gamma used in those which are also determination two-boson exchange box diagram ($\Box_{\gamma Z}$) contribution elastic...
The Jefferson Lab Q_weak experiment determined the weak charge of proton by measuring parity-violating elastic scattering asymmetry longitudinally polarized electrons from an unpolarized liquid hydrogen target at small momentum transfer. A custom apparatus was designed for this to meet technical challenges presented smallest and most precise ${\vec{e}}$p ever measured. Technical milestones were achieved in power, beam current, helicity reversal rate, polarimetry, detected rates, control...
This work demonstrates that two systematic errors, coherent betatron oscillations (CBO) and muon losses can be reduced through application of radio frequency (RF) electric fields, which ultimately increases the sensitivity $g-2$ experiments. As ensemble polarized muons goes around a weak focusing storage ring, their spin precesses, when they decay interaction, $\mu^+ \rightarrow e^+ \nu_e \bar{\nu_\mu}$, positrons are detected by electromagnetic calorimeters. In addition to expected...
The Mu2e experiment will search for the neutrino-less conversion of a muon into an electron in field aluminum nucleus. An observation would be first signal charged lepton flavor violation and de facto evidence new physics beyond Standard Model. clean signature process offers opportunity powerful search: probe four orders magnitude current limits, with real discovery potential over wide range well-motivated models. This goal requires integrated system solenoids that create most intense beam...
A subset of results from the recently completed Jefferson Lab Qweak experiment are reported. This experiment, sensitive to physics beyond Standard Model, exploits small parity-violating asymmetry in elastic ep scattering provide first determination protons weak charge Qweak(p). The employed a 180 uA longitudinally polarized 1.16 GeV electron beam on 35 cm long liquid hydrogen target. Scattered electrons corresponding Q2 0.025 GeV2 were detected eight Cerenkov detectors arrayed symmetrically...
The Q weak experiment, which took data at Jefferson Lab in the period 2010 - 2012, will precisely determine charge of proton by measuring parity-violating asymmetry elastic e-p scattering 1.1 GeV using a longitudinally polarized electron beam and liquid hydrogen target low momentum transfer 2 = 0.025 (GeV/c)2 . is predicted Standard Model any significant deviation would indicate physics beyond Model. technical challenges experimental apparatus for be discussed, as well method extracting...
The $Q_{weak}$ Collaboration has completed a challenging measurement of the parity-violating asymmetry in elastic electron-proton ($\vec{e}$p) scattering at Thomas Jefferson National Accelerator Facility (Jefferson Lab). initial result reported here is extracted from commissioning part experiment, constituting about 4% full data set. low momentum transfer $Q^2$=0.025 GeV$^2$ $A_{ep}$ = -279 $\pm$ 35 (stat) 31 (syst) ppb, which smallest and most precise ever measured $\vec{e}$p scattering....