A5028842701- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Legal and Labor Studies
- Physics of Superconductivity and Magnetism
- Computational Physics and Python Applications
- Human Rights and Immigration
- Superconducting Materials and Applications
- Nuclear physics research studies
- Theoretical and Computational Physics
- Markov Chains and Monte Carlo Methods
- COVID-19 epidemiological studies
- Matrix Theory and Algorithms
- Advanced NMR Techniques and Applications
- Stochastic processes and statistical mechanics
- Inorganic Fluorides and Related Compounds
- Atomic and Subatomic Physics Research
- Quantum and electron transport phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Gas Dynamics and Kinetic Theory
- Phase Equilibria and Thermodynamics
- Fluid Dynamics and Turbulent Flows
- Finance, Taxation, and Governance
- COVID-19 Pandemic Impacts
University of Southern Denmark
2015-2024
European Organization for Nuclear Research
2007-2024
University of Edinburgh
2010-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2023
University of Bonn
2023
Universidad Autónoma de Madrid
2010-2019
Applied Mathematics (United States)
2015-2019
John von Neumann Institute for Computing
2005-2017
University of Münster
2001-2017
University of Regensburg
2017
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 review lattice results related to pion, kaon, $D$-meson, $B$-meson, and nucleon physics with the aim of making them easily accessible nuclear particle communities. More specifically, we report on determination light-quark masses, form factor $f_+(0)$ arising in semileptonic $K \to \pi$ transition at zero momentum transfer, as well decay constant ratio $f_K/f_\pi$ its consequences for CKM matrix elements $V_{us}$ $V_{ud}$. Furthermore, describe obtained some low-energy constants...
Abstract We review lattice results related to pion, kaon, D -meson, B and nucleon physics with the aim of making them easily accessible nuclear particle communities. More specifically, we report on determination light-quark masses, form factor $$f_+(0)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>f</mml:mi> <mml:mo>+</mml:mo> </mml:msub> <mml:mo>(</mml:mo> <mml:mn>0</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> arising in semileptonic $$K...
Motivated by the success of flavour physics programme carried out over last decade at Large Hadron Collider (LHC), we characterize in detail potential its High-Luminosity and High-Energy upgrades this domain physics. We document extraordinary breadth HL/HE-LHC enabled a putative Upgrade II dedicated experiment LHCb evolution established role ATLAS CMS general purpose experiments. connect to studies top quark, Higgs boson, direct high-$p_T$ searches for new particles force carriers. discuss...
We report on our calculation of the nucleon axial charge gA in QCD with two flavours dynamical quarks. A detailed investigation systematic errors is performed, a particular focus contributions from excited states to three-point correlation functions. The use summed operator insertions allows for much better control over such contamination. After performing chiral extrapolation physical pion mass, we find gA=1.223 +/- 0.063 (stat) +0.035 -0.060 (syst), good agreement experimental value.
We introduce new discretizations of the action for static quarks. They achieve an exponential improvement (compared to Eichten-Hill regularization) on signal noise ratio in static-light correlation functions. This is explicitly checked a quenched simulation and it understood quantitatively terms self energy quark lattice heavy potential at zero distance. perform set scaling tests Schrödinger functional find violations O(a) improved theory be rather small — one observable significantly...
A bstract We report on our computation of the leading hadronic contribution to anomalous magnetic moment muon using two dynamical flavours non-perturbatively O( a ) improved Wilson fermions. The strange quark is introduced in quenched approximation. Partially twisted boundary conditions are applied improve momentum resolution relevant integral. Our results, obtained at three different values lattice spacing, allow for preliminary study discretization effects. explore wide range volumes,...
We present a calculation of the hadronic vacuum polarization contribution to muon anomalous magnetic moment, hvp , in lattice QCD employing dynamical up and down quarks. focus on controlling infrared regime function. To this end we employ several complementary approaches, including Padé fits, time moments time-momentum representation. correct our results for finite-volume effects by combining Gounaris-Sakurai parameterization timelike pion form factor with Lüscher formalism. On subset...
We present results for the nucleon electromagnetic form factors, including momentum transfer dependence and derived quantities (charge radii magnetic moment). The analysis is performed using O(a) improved Wilson fermions in Nf=2 QCD measured on CLS ensembles. Particular focus placed a systematic evaluation of influence excited states three-point correlation functions, which lead to biased evaluation, if not accounted correctly. argue that use summed operator insertions fit ans\"atze allow us...
We present a lattice calculation of the nucleon isovector axial and induced pseudoscalar form factors on CLS ensembles using [Formula: see text] dynamical flavors nonperturbatively text]-improved Wilson fermions an current together with density. Excited-state effects in extraction are treated variety methods, detailed discussion their respective merits. The chiral continuum extrapolation results is performed both formulae inspired by Heavy Baryon Chiral Perturbation Theory (HBChPT) global...
We investigate the spreading dynamics of infected cases for SARS-2013 and COVID-19 epidemics different regions world, in terms renormalisation group language. The latter provides an alternative way to describe underlying disease spread. This allows us introduce important quantities, a given disease, such as slope beta function at fixed points time scale epidemic spread inflection point. discover that is order one inverse week point occurs roughly four weeks after outbreak. use these results...
We introduce an alternative discretization for static quarks on the lattice retaining O(a)-improvement properties of Eichten–Hill action. In this formulation, statistical fluctuations are reduced by a factor which grows exponentially with Euclidean time, x0. For first B-meson correlation functions computed good precision in approximation x0>1 fm. At spacings a≈0.1, 0.08, 0.07 fm, Bs-meson decay constant is determined combined and quenched approximation. A correction due to finite mass...
The coefficient cA required for O(a) improvement of the axial current in lattice QCD with Nf=3 flavors Wilson fermions and tree-level Symanzik-improved gauge action is determined non-perturbatively. standard condition using Schrödinger functional boundary conditions employed at constant physics a range couplings relevant simulations spacings ≈0.09 fm below. We define projected onto zero topological charge sector theory, order to avoid problem possibly insufficient tunneling between sectors...
We present a computation of B-meson decay constants from lattice QCD simulations within the framework Heavy Quark Effective Theory for b-quark. The next-to-leading order corrections in HQET expansion are included non-perturbatively. Based on Nf=2 gauge field ensembles, covering three spacings (0.08-0.05)fm and pion masses down to 190MeV, variational method extracting hadronic matrix elements is used keep systematic errors under control. In addition we perform careful autocorrelation analysis...
We study SU$(N_C)$ gauge theories with a single fermion in the two-index antisymmetric representation to predict mesonic spectrum of supersymmetric $\mathcal{N}=1$ SYM theories. Using gradient flow methods, we investigate fractional topological charges $N_C = 4$ ensembles varying lattice spacings. show that use overimproved actions (specifically DBW2 action) smearing kernel stabilises values charge already at moderate time, while this is not case for standard Wilson flow.
We show how quark-disconnected and quark-connected contributions to hadronic n-point functions can be written as independent correlators for which one derive expressions in partially quenched chiral effective theory. As an example we apply the idea case of vacuum polarisation. In particular, consider cases Nf = 2 theory without with a strange quark also + 1 latter two parameter-free prediction disconnected contribution at NLO is given. Finally twisted boundary conditions then used lattice...
We discuss kinematical enhancements of cutoff effects at short and intermediate distances. Starting from a pedagogical example with periodic boundary conditions, we switch to the case Schroedinger Functional, where theoretical analysis is checked by precise numerical data Nf=2 dynamical O(a)-improved Wilson quarks. Finally present an improved determination renormalization axial current in that theory.