A5067297333- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Physics of Superconductivity and Magnetism
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Nuclear physics research studies
- Computational Physics and Python Applications
- Advanced Data Storage Technologies
- Numerical methods for differential equations
- Electromagnetic Scattering and Analysis
- Matrix Theory and Algorithms
- Electromagnetic Simulation and Numerical Methods
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Rare-earth and actinide compounds
- Scientific Computing and Data Management
- Algorithms and Data Compression
- Theoretical and Computational Physics
- Spectral Theory in Mathematical Physics
- Advanced NMR Techniques and Applications
- Benford’s Law and Fraud Detection
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
Cyprus Institute
2017-2025
University of Bonn
2017-2023
Temple University
2019-2023
University of Cyprus
2016-2022
John von Neumann Institute for Computing
2019-2022
University of Utah
2019-2022
Argonne National Laboratory
2019-2022
Michigan State University
2019
University of Wuppertal
2016-2018
Enrico Fermi Center for Study and Research
2017
We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to muon anomalous magnetic moment, ${a}_{\ensuremath{\mu}}^{\mathrm{HVP}}$, in so-called short and intermediate time-distance windows, ${a}_{\ensuremath{\mu}}^{\mathrm{SD}}$ ${a}_{\ensuremath{\mu}}^{\mathrm{W}}$, defined by RBC/UKQCD Collaboration [Phys. Rev. Lett. 121, 022003 (2018)]. employ gauge ensembles produced Extended Twisted Mass (ETMC) with ${N}_{f}=2+1+1$ flavors Wilson-clover...
We evaluate the gluon and quark contributions to spin of proton using an ensemble gauge configuration generated at physical pion mass. compute all valence sea high accuracy. perform a non-perturbative renormalization for both matrix elements. find that contribution up, down, strange charm quarks intrinsic is $\frac{1}{2}\sum_{q=u,d,s,c}\Delta\Sigma^{q^+}=0.191(15)$ total $\sum_{q=u,d,s,c}J^{q^+}=0.285(45)$. The $J^g=0.187(46)$ yielding $J=J^q+J^g=0.473(71)$ confirming sum. momentum fraction...
We determine the nucleon axial, scalar and tensor charges within lattice Quantum Chromodynamics including all contributions from valence sea quarks. analyze three gauge ensembles simulated twisted mass formulation at approximately physical value of pion mass. Two these are with two dynamical light quarks spacing $a=0.094$~fm third $a=0.08$~fm includes in addition strange charm sea. After comparing results among ensembles, we quote as final values our most accurate analysis using latter...
The electromagnetic form factors of the proton and neutron are computed within lattice QCD using simulations with quarks masses fixed to their physical values. Both connected disconnected contributions computed. We analyze two new ensembles $N_f = 2$ 2 + 1 1$ twisted mass clover-improved fermions determine factors, electric magnetic radii, moments. use several values sink-source time separation in range 1.0 fm 1.6 ensure ground state identification. Disconnected calculated an unprecedented...
We present the QCD simulation of first gauge ensemble two degenerate light quarks, a strange and charm quark with all masses tuned to their physical values within twisted mass fermion formulation. Results for pseudoscalar decay constants confirm that produced is indeed at parameters theory. This conclusion corroborated by complementary analysis in baryon sector. examine cutoff isospin breaking effects demonstrate they are suppressed through presence clover term action.
We compute the nucleon axial and induced pseudoscalar form factors using three ensembles of gauge configurations, generated with dynamical light quarks mass tuned to approximately their physical value. One also includes strange charm close physical. The latter ensemble has large statistics finer lattice spacing it is used obtain final results, while other two are for assessing volume effects. factor computed these ensembles. examine momentum dependence as well relations based on pion pole...
We present a first-principles lattice QCD investigation of the R ratio between e^{+}e^{-} cross section into hadrons and muons. By using method Ref. [1], that allows one to extract smeared spectral densities from Euclidean correlators, we compute convoluted with Gaussian smearing kernels widths about 600 MeV central energies 220 up 2.5 GeV. Our theoretical results are compared corresponding quantities obtained by KNT19 compilation [2] R-ratio experimental measurements same and, centering...
We propose a unifying approach that starts from the perturbative construction of trivializing maps by L\"uscher and then improves on it learning. The resulting continuous normalizing flow model can be implemented using common tools lattice field theory requires several orders magnitude fewer parameters than any existing machine learning approach. Specifically, our achieve competitive performance with as few 14 while deep-learning models have around 1 million for $SU(3)$ Yang-Mills ${16}^{2}$...
We compute the nucleon axial and pseudoscalar form factors using three <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>N</a:mi><a:mi>f</a:mi></a:msub><a:mo>=</a:mo><a:mn>2</a:mn><a:mo>+</a:mo><a:mn>1</a:mn><a:mo>+</a:mo><a:mn>1</a:mn></a:math> twisted-mass fermion ensembles with all quark masses tuned to approximately their physical values. The values of lattice spacings these point are 0.080, 0.068, 0.057 fm spatial sizes 5.1, 5.44, 5.47 fm, respectively,...
The adaptive aggregation-base domain decomposition multigrid method [A. Frommer et al., SIAM J. Sci. Comput. 36, A1581 (2014)] is extended for two degenerate flavors of twisted mass fermions. By fine-tuning the parameters we achieve a speed-up order hundred times compared to conjugate gradient algorithm physical value pion mass. A thorough analysis aggregation presented, which provides novel insight into methods lattice quantum chromodynamics independently fermion discretization.
We present results for the moments of nucleon isovector vector and axial generalized parton distribution functions computed within lattice QCD. Three ensembles maximally twisted mass clover-improved fermions simulated with a physical value pion are analyzed. Two these generated using two degenerate light quarks. A third ensemble is used having, in addition to quarks, strange charm quarks sea. careful analysis convergence ground state carried out that shown be essential extracting correct...
We present a calculation of the up, down, strange and charm quark masses performed within lattice QCD framework. use twisted mass fermion action carry out simulations that include in sea two light mass-degenerate quarks, as well quarks. In analysis we gauge ensembles simulated at three values spacing with quarks correspond to pion range from 350 MeV physical value, while are tuned approximately their values. several quantities set scale order check for finite effects continuum limit get...
We present a calculation of the Mellin moments transverse quark spin densities in nucleon using lattice QCD. The are extracted from unpolarized and transversity generalized form factors extrapolated to continuum limit three $N_f=2+1+1$ twisted mass fermion gauge ensembles simulated with physical masses spanning spacings. first moment transversely polarized quarks an shows interesting distortion, which can be traced back sharp falloff factor $\bar{B}_{Tn0}(t)$. isovector tensor anomalous...
We present a lattice determination of the inclusive decay rate process <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>τ</a:mi><a:mo stretchy="false">↦</a:mo><a:msub><a:mrow><a:mi>X</a:mi></a:mrow><a:mrow><a:mi>u</a:mi><a:mi>s</a:mi></a:mrow></a:msub><a:msub><a:mrow><a:mi>ν</a:mi></a:mrow><a:mrow><a:mi>τ</a:mi></a:mrow></a:msub></a:mrow></a:math> in which <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mi>τ</d:mi></d:math> lepton...
We determine the nucleon axial, scalar and tensor charges at continuum limit by analyzing three $N_f=2+1+1$ twisted mass fermion ensembles with all quark masses tuned to approximately their physical values. include contributions from valence sea quarks. use Akaike Information Criterion evaluate systematic errors due excited states extrapolation. For isovector axial charge we find $g_A^{u-d}=1.250(24)$, in agreement experimental value. compute for each flavor. The provides crucial information...
By employing the RM123 approach to QCD+QED, we computed valence quark-connected isospin-breaking corrections light, strange and charm contributions at leading order in $\alpha_{\mathrm{em}}$ $\left(\mu_d-\mu_u\right) / \Lambda_{\mathrm{QCD}}$. Here report preliminary results on two different volumes ($L \sim 3.8$ fm $L 5.1$ fm) a fixed lattice spacing (corresponding $a_{\text {isoQCD }} 0.07951(4)$ fm), obtained framework of ongoing computation by ETMC leading-order hadronic vacuum...
Low Mode Average (LMA) is a technique to improve the quality of signal-to-noise ratio in long time separation Euclidean correlation functions. We report on its beneficial impact computing vector-vector light connected two-point functions and derived physical quantities mixed action lattice setup adopted by ETM collaboration. focus preliminary results computation within isospin symmetric QCD (isoQCD) $R$-ratio smeared with Gaussian kernels widths down $\sigma\sim250$ MeV, which enough...
We compute the electromagnetic form factors of proton and neutron using lattice QCD with $N_f = 2 + 1 1$ twisted mass clover-improved fermions quark masses tuned to their physical values. Three ensembles spacings $a$=0.080 fm, 0.068 0.057 approximately same volume allow us obtain continuum limit directly at pion mass. Several values source-sink time separation ranging from 0.5 fm 1.5 are used, enabling a thorough analysis excited state effects via multi-state fits. The disconnected...
We present the isovector axial, induced pseudoscalar, and pseudoscalar form factors of nucleon using three twisted-mass fermion ensembles with degenerate up- down-, strange-, charm-quarks masses tuned to their physical values (physical point). The have lattice spacing $a$=0.08, 0.068, 0.057 fm approximately equal volume allowing for continuum limit be taken at point. Excited-state contributions matrix elements are evaluated several sink-source separations from 0.5 1.5 multistate fits. check...
We present results on the momentum fraction carried by quarks and gluons in pion kaon. employ three gauge ensembles generated with $N_f=2+1+1$ Wilson twisted-mass clover-improved fermions physical quark masses. perform, for first time, a continuum extrapolation directly at pion. find that total is $\langle x \rangle_{q, R}^{\pi}= 0.575(79)$ \rangle_{q,R}^{K} = 0.683(50)$ \rangle_{g, R}^{\pi}=0.402(53)$ R}^{K}=0.422(67)$ kaon, respectively, $\overline{\mathrm{MS}}$ scheme renormalization...
We present a lattice calculation of the hadronic vacuum polarization (HVP) contribution strange and charm quarks to anomalous magnetic moment muon in isospin symmetric QCD. employ gauge configurations generated by Extended Twisted Mass Collaboration (ETMC) with <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>N</a:mi><a:mi>f</a:mi></a:msub><a:mo>=</a:mo><a:mn>2</a:mn><a:mo>+</a:mo><a:mn>1</a:mn><a:mo>+</a:mo><a:mn>1</a:mn></a:math> flavors Wilson-clover...
We determine the nucleon axial, scalar, and tensor charges <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>σ</a:mi></a:math>-terms using twisted mass fermions. employ three ensembles with approximately equal physical volume of about 5.5 fm, values lattice spacing, 0.06, 0.07, 0.08 degenerate up down, strange charm quarks tuned to their values. compute both isovector isoscalar <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...