G. G. Hesketh
A5105890867- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Advanced Data Storage Technologies
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Radiation Effects in Electronics
- International Science and Diplomacy
- Structural Analysis of Composite Materials
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Algorithms and Data Compression
- Big Data Technologies and Applications
- Scientific Research and Discoveries
University College London
2015-2024
University of Geneva
2021
The University of Adelaide
2013-2020
University of Hong Kong
2020
University of Manchester
2011-2019
University of Pennsylvania
2019
Royal Society
2017
Harvard University
2015
University of Birmingham
2015
Universidade Estadual Paulista (Unesp)
2011
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...
Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at weak scale. When produced experiments such as Large Hadron Collider (LHC) CERN, these long-lived (LLPs) decay far from interaction vertex of primary proton-proton collision. Such LLP signatures distinct those promptly decaying targeted by majority searches for new physics LHC, often requiring customized techniques identify, example, significantly displaced vertices, tracks with...
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...
The Mu3e experiment aims to find or exclude the lepton flavour violating decay $\mu \rightarrow eee$ at branching fractions above $10^{-16}$. A first phase of using an existing beamline Paul Scherrer Institute (PSI) is designed reach a single event sensitivity $2\cdot 10^{-15}$. We present overview all aspects technical design and expected performance phase~I detector. high rate up $10^{8}$ muon decays per second low momenta electrons positrons pose unique set challenges, which we tackle...
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...
The 2011 Les Houches workshop was the first to confront LHC data. In two years since previous there have been significant advances in both soft and hard QCD, particularly areas of multi-leg NLO calculations, inclusion those calculations into parton shower Monte Carlos, tuning non-perturbative parameters Carlos. These proceedings describe theoretical that taken place, impact early data, for future development.
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,...
This letter of intent proposes an experiment to search for electric dipole moment the muon based on frozen-spin technique. We intend exploit high field, $E=1{\rm GV/m}$, experienced in rest frame with a momentum $p=125 {\rm MeV/}c$ when passing through large magnetic field $|\vec{B}|=3{\rm T}$. Current fluxes at $μ$E1 beam line permit improved sensitivity $σ(d_μ)\leq 6\times10^{-23}e{\rm cm}$, about three orders magnitude more than current upper limit $|d_μ|\leq1.8\times10^{-19}e{\rm...
The Mu3e experiment aims to find or exclude the lepton flavour violating decay $\mu^+\to e^+e^-e^+$ with a sensitivity of one in 10$^{16}$ muon decays. first phase is currently under construction at Paul Scherrer Institute (PSI, Switzerland), where beams up 10$^8$ muons per second are available. detector will consist an ultra-thin pixel tracker made from High-Voltage Monolithic Active Pixel Sensors (HV-MAPS), complemented by scintillating tiles and fibres for precise timing measurements....
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...
Monte Carlo event generators (MCEGs) are the indispensable workhorses of particle physics, bridging gap between theoretical ideas and first-principles calculations on one hand, complex detector signatures data experimental community other hand. All collider physics experiments dependent simulated events by MCEG codes such as Herwig, Pythia, Sherpa, POWHEG, MG5_aMC@NLO to design tune their detectors analysis strategies. The development MCEGs is overwhelmingly driven a vibrant academics at...
Abstract The Muon g -2 Experiment at Fermilab uses a gaseous straw tracking detector to make detailed measurements of the stored muon beam profile, which are essential for experiment achieve its uncertainty goals. Positrons from decays spiral inward and pass through before striking an electromagnetic calorimeter. is therefore located inside vacuum chamber in region where magnetic field large non-uniform. As such, must have low leak rate maintain high-quality vacuum, be non-magnetic so as not...
The leptonic decays of the heavy gauge bosons W and/or Z provide a clear experimental signature at hadron colliders. production accompanying jets is an excellent signal to probe QCD, while also being main background many searches for new physics. Describing complex final state or + theoretical challenge with most existing calculations combining matrix elements high energy jet parton shower lower production. We focus on two models: SHERPA, which uses Leading Order boson and production; POWHEG...
We present an update on the status of W and Z cross sections in proton-antiproton collisions at 1.96 TeV behalf DZero CDF collaborations. Preliminary studies differential with different jet multiplicities as a function transverse energy are also presented.
The latest measurements of the production W or Z boson in association with jets by ATLAS detector are reported. A data-set proton-proton collisions corresponding to an integrated luminosity approximately 4.6 fb-1 have been analysed, and new results + jet production, ratio charm, b-jet described. Extensive comparisons from theoretical calculations also included.
This paper describes a new measurement of the flux ratio positive and negative muons from cosmic-ray interactions in atmosphere, using data collected by CMS detector at ground level underground experimental cavern. The excellent performance allowed detection momentum range 3 GeV to 1 TeV. For muon momenta below 100 is measured be constant $1.2766 \pm 0.0032(stat) 0.0032(syst)$, most precise date. At higher an increase charge asymmetry observed, agreement with models production showers...