A5062395056- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Markov Chains and Monte Carlo Methods
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- Atomic and Molecular Physics
- Physics of Superconductivity and Magnetism
- Atomic and Subatomic Physics Research
- Theoretical and Computational Physics
- Cosmology and Gravitation Theories
- Noncommutative and Quantum Gravity Theories
- Quantum chaos and dynamical systems
- Advanced Operator Algebra Research
- Statistical Methods and Inference
- Superconducting Materials and Applications
- Advanced Neuroimaging Techniques and Applications
- Inorganic Fluorides and Related Compounds
- Bayesian Methods and Mixture Models
- Spectral Theory in Mathematical Physics
- Crystallization and Solubility Studies
- Solid-state spectroscopy and crystallography
- Mathematical functions and polynomials
- Quantum, superfluid, helium dynamics
Instituto de Física Corpuscular
2021-2024
Universitat de València
2020-2024
University of Wuppertal
2022-2024
Humboldt-Universität zu Berlin
2022-2024
John von Neumann Institute for Computing
2013-2024
European Organization for Nuclear Research
2015-2024
Trinity College Dublin
2015-2024
University of Turin
2023
University of Edinburgh
2023
Parc Científic de la Universitat de València
2022-2023
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 $$K...
Abstract We propose a new strategy for the determination of step scaling function $$\sigma (u)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>σ</mml:mi> <mml:mo>(</mml:mo> <mml:mi>u</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> in finite size studies using gradient flow. In this approach is broken two pieces: change flow time at fixed physical size, and system time. Using both perturbative arguments set simulations pure gauge theory we show that leads to...
By using lattice QCD computations we determine the sigma terms and strangeness content of all octet baryons by means an application Hellmann-Feynman theorem. In addition to polynomial rational expressions for quark-mass dependence members, use $SU(3)$ covariant baryon chiral perturbation theory perform extrapolation physical up down quark masses. Our ${N}_{f}=2+1$ ensembles include pion masses about 190 MeV in large volumes (${M}_{\ensuremath{\pi}}L\ensuremath{\gtrsim}4$), three values...
We present a lattice determination of the Λ parameter in three-flavor QCD and strong coupling at Z pole mass. Computing nonperturbative running range from 0.2 to 70 GeV, using experimental input values for masses decay constants pion kaon, we obtain Λ_{MS[over ¯]}^{(3)}=341(12) MeV. The up very high energies guarantees that systematic effects associated with perturbation theory are well under control. Using four-loop prediction ¯]}^{(5)}/Λ_{MS[over ¯]}^{(3)} yields α_{MS[over...
We apply the Symanzik improvement programme to 4+1-dimensional local re-formulation of gradient flow in pure $SU(N)$ lattice gauge theories. show that classical nature equation allows eliminate all cutoff effects at $\mathcal O(a^2)$ which originate either from discretized or observable. All remaining can be understood terms counterterms zero time boundary. classify these and provide a complete set as required for on-shell improvement. Compared 4-dimensional theory only single additional...
Abstract Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant α S . The current <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi class="MJX-tex-calligraphic" mathvariant="script">O</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mn>1</mml:mn> <mml:mo>%</mml:mo>...
While electromagnetic and up-down quark mass difference effects on octet baryon masses are very small, they have important consequences. The stability of the hydrogen atom against beta decay is a prominent example. Here we include these by adding them to valence quarks in lattice QCD calculation based $N_f=2+1$ simulations with 5 spacings down 0.054 fm, sizes up 6 fm average all way their physical value. This allows us gain control over systematic errors, except for one associated neglecting...
We discuss the setup and features of a new definition running coupling in Schr\"odinger functional scheme based on gradient flow. Its suitability for precise continuum limit QCD is demonstrated set Nf=2 gauge field ensembles physical volume L~0.4fm.
In order to calculate QED corrections hadronic physical quantities by means of lattice simulations, a coherent description electrically-charged states in finite volume is needed. the usual periodic setup, Gauss's law and large gauge transformations forbid propagation states. A possible solution this problem, which does not violate axioms local quantum field theory, has been proposed Wiese Polley, based on use C⋆ boundary conditions. We present thorough analysis properties symmetries...
We determine the ratio ${F}_{K}/{F}_{\ensuremath{\pi}}$ in QCD with ${N}_{f}=2+1$ flavors of sea quarks, based on a series lattice calculations three different spacings, large volumes, and simulated pion mass reaching down to about 190 MeV. obtain ${F}_{K}/{F}_{\ensuremath{\pi}}=1.192(7{)}_{\mathrm{stat}}(6{)}_{\mathrm{syst}}$. This result is then used give an updated value Cabibbo-Kobayashi-Maskawa) matrix element $|{V}_{us}|$. The unitarity relation for first row this found be well observed.
Using a finite volume gradient flow renormalization scheme with Schr\"odinger Functional boundary conditions, we compute the nonperturbative running coupling in range $2.2\ensuremath{\lesssim}{\overline{g}}_{\mathrm{GF}}^{2}(L)\ensuremath{\lesssim}13$. Careful continuum extrapolations turn out to be crucial reach our high accuracy. The of is always between one loop and two very close region $200\text{ }\text{...
We discuss the determination of strong coupling α_{MS[over ¯]}(m_{Z}) or, equivalently, QCD Λ parameter. Its requires use perturbation theory in α_{s}(μ) some scheme s and at energy scale μ. The higher μ, more accurate becomes, owing to asymptotic freedom. As one step our computation parameter three-flavor QCD, we perform lattice computations a that allows us nonperturbatively reach very high energies, corresponding α_{s}=0.1 below. find (continuum) is there, yielding 3% error parameter,...
Using finite size scaling techniques and a renormalization scheme based on the Gradient Flow, we determine non-perturbatively $\beta$-function of $SU(3)$ Yang-Mills theory for range renormalized couplings $\bar g^2\sim 1-12$. We perform detailed study matching with asymptotic NNLO perturbative behavior at high-energy, our non-perturbative data showing significant deviation from prediction down to $\bar{g}^2\sim1$. conclude that schemes Flow are not competitive match behavior, even when...
Abstract The recent introduction of machine learning techniques, especially normalizing flows, for the sampling lattice gauge theories has shed some hope on improving efficiency traditional hybrid Monte Carlo (HMC) algorithm. In this work we study a modified HMC algorithm that draws seminal trivializing flows by Lüscher. Autocorrelations are reduced from simpler action is related to original an invertible mapping realised through Normalizing Flows models with minimal set training parameters....
We study the gradient flow for Yang-Mills theories with twisted boundary conditions. The perturbative behavior of energy density $\langle E(t)\rangle$ is used to define a running coupling at scale given by linear size finite volume box. compute non-perturbative pure gauge $SU(2)$ constant and conclude that technique well suited further applications due relatively mild cutoff effects step scaling function high numerical precision can be achieved in lattice simulations. also comment on...
We propose a modification of the Hybrid Monte Carlo (HMC) algorithm that overcomes topological freezing two-dimensional $U(1)$ gauge theory with and without fermion content. This includes reversible jumps between sectors$-$winding steps$-$combined standard HMC steps. The full is referred to as winding (wHMC), it shows an improved behaviour autocorrelation time towards continuum limit. find excellent agreement wHMC estimates plaquette susceptibility analytical predictions in pure theory,...
We perform the step-scaling investigation of running coupling constant, using gradient-flow scheme, in SU(3) gauge theory with twelve massless fermions fundamental representation. The Wilson plaquette action and unimproved staggered are used simulations. Our lattice data prepared at high accuracy, such that statistical error for renormalised coupling, g GF , is subpercentage level. To investigate reliability continuum extrapolation, we employ two different discretisations to obtain . For our...
<title>Abstract</title> Modern particle physics experiments, e.g. at the Large Hadron Collider (LHC) CERN, crucially depend on precise description of scattering processes in terms known fundamental forces. This is limited by our current understanding strong nuclear force, as quantified coupling, $\alpha_s$, between quarks and gluons. Relating $\alpha_s$ to experiments poses a major challenge interactions lead confinement gluons inside hadronic bound states. At high energies, however, become...
We propose a new strategy for the determination of QCD coupling. It relies on coupling computed in with Nf≥3 degenerate heavy quarks at low energy scale μdec, together non-perturbative ratio Λ/μdec pure gauge theory. explore this idea using finite volume renormalization scheme case Nf=3 QCD, demonstrating that precise value strong αs can be obtained. The is quite general and applied to solve other problems, or infinite intermediate schemes.
In this proceedings contribution we will review the main ideas behind many recent works that apply gradient flow to determination of renormalized coupling and renormalization composite operators. We pay special attention continuum extrapolation quantities.