A. Chapelain
A5000918821- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Muon and positron interactions and applications
- Scientific Research and Discoveries
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Quantum and electron transport phenomena
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
Cornell University
2015-2024
CEA Paris-Saclay
2013-2018
Institut de Recherche sur les Lois Fondamentales de l'Univers
2013-2018
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2018
Délégation Paris 7
2014
Université Paris Cité
2014
Campbell Collaboration
2013
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...
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 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 present measurements of asymmetries in angular distributions leptons produced ttbar events proton-antiproton collisions at the Fermilab Tevatron Collider. consider final states where W bosons from top quark and antiquark decays both decay into l nu (l=e, mu) resulting oppositely charged dilepton with accompanying jets. Using 9.7 fb^-1 integrated luminosity collected D0 detector, we find lepton pseudorapidity compatible predictions based on standard model.
The upcoming Fermilab E989 experiment will measure the muon anomalous magnetic moment aμ. This measurement is motivated by previous performed in 2001 BNL E821 that reported a 3-4 standard deviation discrepancy between measured value and Standard Model prediction. new at aims to improve precision factor of four reducing total uncertainty from 540 parts per billion (BNL E821) 140 (Fermilab E989). paper gives status experiment.
We have developed a custom amplifier board coupled to large-format 16-channel Hamamatsu silicon photomultiplier device for use as the light sensor electromagnetic calorimeters in Muon g-2 experiment at Fermilab. The calorimeter absorber is an array of lead-fluoride crystals, which produces short-duration Cherenkov light. detector sits high magnetic field muon storage ring. SiPMs selected, and their accompanying electronics, must preserve short pulse shape, quantum efficiency, be...
We present measurements of the forward-backward asymmetry in angular distribution leptons from decays top quarks and antiquarks produced proton-antiproton collisions. consider final state containing a lepton at least three jets. The entire sample data collected by D0 experiment during Run II Fermilab Tevatron Collider, corresponding to 9.7 inverse fb integrated luminosity, is used. measured for reconstructed $A_{FB}^l = \big(2.9 \pm 2.1(stat.) ^{+1.5}_{-1.7}(syst.) \big)$%. When corrected...
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 Muon $g-2$ experiment, E989, is currently taking data at Fermilab with the aim of reducing experimental error on muon anomaly by a factor four and possibly clarifying current discrepancy theoretical prediction. A central component this four-fold improvement in precision laser calibration system calorimeters, which has to monitor gain variations photo-sensors 0.04\% short-term ($\sim 1\,$ms). This about one order magnitude better than what ever been achieved for particle physics...
The upcoming Fermilab E989 experiment will measure the muon anomalous magnetic moment a_μ. This measurement is motivated by previous performed in 2001 BNL E821 that reported a 3-4 standard deviation discrepancy between measured value and Standard Model prediction. new at aims to improve precision factor of four reducing total uncertainty from 540 parts per billion (BNL E821) 140 (Fermilab E989). Such an improvement requires reduction three systematic uncertainties. Among other improvements,...
In this note we present the charge asymmetry measurements of top quark-antiquark pairs at hadron colliders. We will focus on dilepton channel ATLAS (LHC) and D0 (Tevatron).
We present the legacy measurement of leptonic ttbar charge asymmetry in dilepton channel with D0 detector.