A5006724732- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Lung Cancer Research Studies
- International Science and Diplomacy
- Geophysics and Gravity Measurements
- Image and Signal Denoising Methods
- Crystallography and Radiation Phenomena
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- advanced mathematical theories
University of Liverpool
2016-2025
Universidade de São Paulo
2020
San Francisco State University
2019-2020
University of Mississippi
2019-2020
York University
2019-2020
The University of Adelaide
2019-2020
High Energy Accelerator Research Organization
2019-2020
Universitat Autònoma de Barcelona
2019-2020
University of Regensburg
2020
Istituto Nazionale di Fisica Nucleare
2020
We review the present status of Standard Model calculation anomalous magnetic moment muon. This is performed in a perturbative expansion fine-structure constant $\alpha$ and broken down into pure QED, electroweak, hadronic contributions. The QED contribution by far largest has been evaluated up to including $\mathcal{O}(\alpha^5)$ with negligible numerical uncertainty. electroweak suppressed $(m_\mu/M_W)^2$ only shows at level seventh significant digit. It two loops known better than one...
We update our Standard Model predictions for g-2 of the muon and hadronic contributions to running QED coupling, Delta alpha_had^(5)(M_Z^2). Particular emphasis is put on recent changes in from new data 2pi channel energy region just below 2 GeV. In particular, e+e- -> pi+pi- contribution we include `radiative return' KLOE BaBar. also BaBar other exclusive channels. make a detailed study effect replacing measurements inclusive cross section, sigma(e+e- hadrons), by sum channels interval 1.43...
This work presents a complete reevaluation of the hadronic vacuum polarization contributions to anomalous magnetic moment muon, aμhad,VP, and effective QED coupling at mass Z boson, Δαhad(MZ2), from combination e+e−→hadrons cross section data. Focus has been placed on development new data method, which fully incorporates all correlated statistical systematic uncertainties in bias free approach. All available have analyzed included, where compilation yielded full R-ratio its covariance matrix...
Following updates in the compilation of $e^+e^-\rightarrow{\rm hadrons}$ data, this work presents re-evaluations hadronic vacuum polarisation contributions to anomalous magnetic moment electron ($a_e$), muon ($a_\mu$) and tau lepton ($a_\tau$), ground-state hyperfine splitting muonium also running QED coupling at mass scale $Z$ boson, $\alpha(M_Z^2)$. Combining results for with recent light-by-light corrections, electromagnetic weak contributions, deviation between measured value $a_\mu$ its...
In this paper, we discuss how windows in Euclidean time can be used to isolate the origin of potential conflicts between evaluations hadronic-vacuum-polarization (HVP) contribution anomalous magnetic moment muon lattice QCD and from $e^+e^-\to\text{hadrons}$ cross-section data. We provide phenomenological comparison numbers evaluated data for window quantities most commonly studied QCD, complete with correlations among them. evaluate modifications parameters that could useful dissecting...
We calculate $g\ensuremath{-}2$ of the muon and QED coupling $\ensuremath{\alpha}{(M}_{Z}^{2}),$ by improving determination hadronic vacuum polarization contributions their uncertainties. include recently reanalyzed CMD-2 data on ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}.$ carefully combine a wide variety for ${e}^{+}{e}^{\ensuremath{-}}$ production hadrons obtain optimum form...
We describe a new technique to determine the contribution anomalous magnetic moment of muon coming from hadronic vacuum polarization using lattice QCD. Our method reconstructs Adler function, Pad\'e approximants, its derivatives at ${q}^{2}=0$ obtained simply and accurately time-moments vector current-current correlator zero spatial momentum. test strange quark correlators on large-volume gluon field configurations that include effect up down (at physical masses), charm quarks in sea...
A bstract The three precision measurements of the cross section σ ( e + − → π γ(γ)) using initial state radiation by KLOE collaboration provide an important input for prediction hadronic contribution to anomalous magnetic moment muon. These are correlated both statistical and systematic uncertainties and, therefore, simultaneous use these requires covariance matrices that fully describe correlations. We present construction them determine a combined measurement γ(γ)). find, from this...
The complete next-to-next-to-leading order (NNLO) QCD corrections to the total cross section $\ensuremath{\sigma}{(e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{Z}^{*},{\ensuremath{\gamma}}^{*}\ensuremath{\rightarrow}t\overline{t}),$ in kinematic region close top-quark--top-antiquark threshold, are calculated by solving corresponding Schr\"odinger equations exactly momentum space a consistent cutoff regularization scheme. coming from same NNLO effects top-quark three-momentum...
We update our Standard Model predictions for g-2 of the muon and hadronic contributions to running QED coupling, Δα(5)had(M2Z). Particular emphasis is put on recent changes in from new data 2π channel energy region just below 2 GeV.
We study exclusive vector meson photoproduction, with or ϒ, at next-to-leading order (NLO) in collinear factorisation, to examine what may be learnt about the gluon distribution very low x. factorisation scale dependence of predictions. argue that, using knowledge NLO corrections, terms enhanced by a large can reabsorbed LO part choice scale. (In these processes ξ takes role Bjorken-x.) Then, coming from remaining contributions has no enhancements. As result, we find that predictions for...
We compare the cross section for exclusive $J/\ensuremath{\psi}$ photoproduction calculated at next-to-leading order (NLO) in collinear factorization approach with HERA and LHCb data. Using optimum scale formalism together subtraction of low ${k}_{t}$ contribution (below input ${Q}_{0}$) from NLO coefficient function to avoid double counting, we show that existing global parton distribution functions (PDFs) are consistent data within their uncertainties. This is first time production were...
The KNTW (Keshavarzi-Nomura-Teubner-Wright) data-driven determinations of the hadronic vacuum polarization (HVP) are crucial inputs to previous and future Standard Model (SM) predictions muon’s anomalous magnetic moment, <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>a</a:mi><a:mi>μ</a:mi></a:msub></a:math>. With muon <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>g</c:mi><c:mo>−</c:mo><c:mn>2</c:mn></c:math>’s new physics...
The complete next-to-next-to-leading order [i.e., $\mathcal{O}{(v}^{2}),$ $\mathcal{O}(v{\ensuremath{\alpha}}_{s}),$ and $\mathcal{O}({\ensuremath{\alpha}}_{s}^{2})]$ relativistic corrections to the total photon mediated $t\overline{t}$ production cross section at threshold are presented in framework of nonrelativistic quantum chromodynamics. results obtained using semianalytic methods ``direct matching.'' size is found be comparable next-to-leading ones.