A5084666405- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Physics of Superconductivity and Magnetism
- Quantum many-body systems
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Economic Growth and Productivity
- Quantum and electron transport phenomena
- Theoretical and Computational Physics
- Economic theories and models
- Innovation Diffusion and Forecasting
- Atomic and Subatomic Physics Research
- Polish socio-economic development
- Economic and Fiscal Studies
- Labour Market and Migration
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Complex Network Analysis Techniques
- Fiscal Policy and Economic Growth
- Complex Systems and Time Series Analysis
- Regional Development and Policy
- Cosmology and Gravitation Theories
- Advanced Chemical Physics Studies
Adam Mickiewicz University in Poznań
2016-2025
Temple University
2022-2024
University of Bonn
2012-2023
Institute for Research in Fundamental Sciences
2023
Deutsches Elektronen-Synchrotron DESY
2022-2023
Argonne National Laboratory
2023
Brookhaven National Laboratory
2023
Pennsylvania State University
2023
Jagiellonian University
2023
Institute of Nuclear Physics, Polish Academy of Sciences
2023
We report on our exploratory study for the direct evaluation of parton distribution functions from lattice QCD, based a recently proposed new approach. present encouraging results using ${N}_{f}=2+1+1$ twisted mass fermions with pion about 370 MeV. The focus this work is detailed description computation, including calculation, matching to an infinite momentum and nucleon correction. In addition, we test effect gauge link smearing in operator estimate influence Wilson line renormalization,...
A bstract We show the feasibility of tensor network solutions for lattice gauge theories in Hamiltonian formulation by applying matrix product states algorithms to Schwinger model with zero and non-vanishing fermion mass. introduce new techniques compute excitations a system open boundary conditions, identify corresponding low momentum different quantum numbers continuum. For ground state both vector scalar mass gaps massive case, MPS technique attains precisions comparable best results...
In this work we present, for the first time, non-perturbative renormalization unpolarized, helicity and transversity quasi-PDFs, in an RI' scheme. The proposed prescription addresses simultaneously all aspects of renormalization: logarithmic divergences, finite as well linear divergence which is present matrix elements fermion operators with Wilson lines. Furthermore, case unpolarized describe how to eliminate unwanted mixing twist-3 scalar operator. We utilize perturbation theory one-loop...
We extract parton distribution functions (PDFs) of the nucleon from lattice QCD using an ensemble gauge field configurations simulated with light quark masses fixed to their physical values. Theoretical and algorithmic improvements that allow such a calculation include momentum smearing reach large boosts reduced statistical errors, nonperturbative renormalization, target mass corrections, novel modified matching results connect what is extracted experimental measurements. give on...
We present the first direct calculation of transversity parton distribution function within nucleon from lattice QCD. The is performed using simulations with light quark mass fixed to its physical value and at one spacing. Novel elements calculations are non-perturbative renormalization extraction a formula for matching light-cone PDFs. Final results presented in $\overline{\rm MS}$ scheme scale $\sqrt{2}$ GeV.
We provide an analysis of the $x$ dependence bare unpolarized, helicity, and transversity isovector parton distribution functions (PDFs) from lattice calculations employing (maximally) twisted mass fermions. The calculated PDFs resembles one phenomenological parameterizations, a feature that makes this approach very promising. Furthermore, we apply momentum smearing for relevant matrix elements to compute find large improvement factor when compared conventional Gaussian smearing. This allows...
We combine lattice QCD results for the potential of two static antiquarks in presence quarks $q q$ finite mass and quark model techniques to study possibly existing q \bar{b} \bar{b}$ tetraquarks. While there is strong indication a bound four-quark state = (ud-du) / \sqrt{2}$, i.e. isospin $I=0$, we find clear evidence against existence corresponding tetraquarks with \in \{ uu , (ud+du) \sqrt{2} dd \}$, $I=1$, s s$ c c$.
The isospin, spin and parity dependent potential of a pair $B$ mesons is computed using Wilson twisted mass lattice QCD with two flavors degenerate dynamical quarks. meson addressed in the static-light approximation, i.e. $b$ quarks are infinitely heavy. From results $BB$ meson-meson potentials, simple rule can be deduced stating which combinations correspond to attractive repulsive forces. We provide fits ground state potentials channels discuss excited channels. most important since they...
We present the first calculation of $x$-dependence proton generalized parton distributions (GPDs) within lattice QCD. Results are obtained for isovector unpolarized and helicity GPDs. compute appropriate matrix elements fast-moving protons coupled to non-local operators containing a Wilson line. results momenta $0.83,\,1.25,\,1.67$ GeV, momentum transfer squared $0.69,\,1.38$ GeV$^2$. These combinations include cases with zero nonzero skewness. The is performed using one ensemble two...
We numerically study the zero temperature phase structure of multiflavor Schwinger model at nonzero chemical potential. Using matrix product states, we reproduce analytical results for two flavors in massless case and extend computation to massive case, where no predictions are available. Our calculations allow us locate transitions mass-chemical potential plane with great precision provide a concrete example tensor networks overcoming sign problem lattice gauge theory calculation.
We present a detailed study of the helicity-dependent and helicity-independent collinear parton distribution functions (PDFs) nucleon, using quasi-PDF approach. The lattice QCD computation is performed employing twisted mass fermions with physical value light quark mass. give systematic in-depth account salient features entering in evaluation quasi-PDFs their relation to light-cone PDFs. In particular, we details for matrix elements, including various sources uncertainties, such as excited...
Within the theory of Quantum Chromodynamics (QCD), rich structure hadrons can be quantitatively characterized, among others, using a basis universal non-perturbative functions: parton distribution functions (PDFs), generalized distributions (GPDs), transverse-momentum dependent (TMDs) and amplitudes (DAs). For more than half century, there has been joint experimental theoretical effort to obtain these partonic functions. However, complexity strong interactions placed severe limitations,...
In this work, we perform a lattice QCD study of the intrinsic, rapidity-independent soft function within framework large momentum effective theory. The computation is carried out using gauge ensemble N_{f}=2+1+1 clover-improved twisted mass fermion. After applying an appropriate renormalization procedure and removal significant higher-twist contamination, obtain intrinsic that comparable to one-loop perturbative result at external momentum. determination nonperturbative from first principles...
Traditionally, lattice QCD computations of generalized parton distributions (GPDs) have been carried out in a symmetric frame, where the transferred momentum is symmetrically distributed between incoming and outgoing hadrons. However, such frames are inconvenient since they require separate calculation for each value transfer, increasing significantly computational cost. In this work, by focusing on quasi-distribution approach, we lay foundation faster more effective calculations GPDs...
For the first time, we present a lattice QCD determination of Mellin moments unpolarized generalized parton distributions (GPDs) proton from an analysis quasi-GPD matrix elements within short-distance factorization framework. We perform our calculation on $N_f$=2+1+1 twisted mass fermions ensemble with clover improvement at spacing $a=0.093$ fm and pion $m_\pi=260$ MeV. Focusing zero-skewness case, iso-vector iso-scalar quasi-GPDs are calculated $\gamma_0$ definition, as well recently...
Recently, we made significant advancements in improving the computational efficiency of lattice QCD calculations for generalized parton distributions (GPDs). This progress was achieved by adopting matrix elements asymmetric frames, deviating from computationally-expensive symmetric frame typically used, and allowing freedom choice distribution momentum transfer between initial final states. A crucial aspect this approach involves adoption a Lorentz covariant parametrization elements,...
We demonstrate the suitability of tensor network techniques for describing thermal evolution lattice gauge theories. As a benchmark case, we have studied temperature dependence chiral condensate in Schwinger model, using matrix product operators to approximate equilibrium states finite system sizes with non-zero spacings. show how these allow reliable extrapolations bond dimension, step width, size and spacing, systematic estimation control all error sources involved calculation. The reached...
Tensor network (TN) methods, in particular the Matrix Product States (MPS) ansatz, have proven to be a useful tool analyzing properties of lattice gauge theories. They allow for very good precision, much better than standard Monte Carlo (MC) techniques models that been studied so far, due possibility reaching smaller spacings. The real reason interest TN approach, however, is its ability, shown far several condensed matter models, deal with theories which exhibit notorious sign problem MC...
Formulating gauge theories on a lattice offers genuinely non-perturbative way of studying quantum field theories, and has led to impressive achievements. In particular, it significantly deepened our understanding chromodynamics. Yet, some very relevant problems remain inherently challenging, such as real time evolution, or the presence chemical potential, cases in which Monte Carlo simulations are hindered by sign problem. last few years, number possible alternatives have been put forward,...
A bstract We revise the relation between Parton Distribution Functions (PDFs) and matrix elements computable from lattice QCD, focusing on quasi-Parton (qPDFs) approach. exploit PDFs qPDFs in case of unpolarized isovector parton distribution to obtain a factorization formula relating real imaginary part specific nonsinglet distributions, we propose general framework extract available data, treating them same footing as experimental data. implement proposed approach within NNPDF framework,...
One of the great challenges QCD is to determine partonic structure nucleon from first principles. In this work, we provide such a determination flavor non-singlet ($u-d$) unpolarized parton distribution function (PDF), utilizing non-perturbative formulation on lattice. We apply Radyushkin's pseudo-distribution approach lattice results obtained using simulations with light quark mass fixed its physical value; ever attempt for directly at point. The extracted coordinate-space matrix elements...
The quasi-PDF approach provides a path to computing parton distribution functions (PDFs) using lattice QCD. This requires matrix elements of power-divergent operator in nucleon at high momentum and one generically expects discretization effects starting first order the spacing $a$. Therefore, it is important demonstrate that continuum limit can be reliably taken understand size shape artifacts. In this work, we report calculation isovector unpolarized helicity PDFs ensembles with $N_f=2+1+1$...
We present the first calculation of $x$-dependence isovector transversity generalized parton distributions (GPDs) for proton within lattice QCD. compute matrix elements with non-local operators containing a Wilson line. The implements Breit symmetric frame. momenta are chosen as $0.83,\,1.25,\,1.67$ GeV, and values momentum transfer squared $0.69,\,1.02$ GeV$^2$. These combinations include cases zero nonzero skewness. is performed using one ensemble two degenerate-mass light, strange charm...
This work presents the first lattice-QCD calculation of twist-3 axialquark generalized parton distributions (GPDs) for proton using large-momentum effective theory approach. We calculate matrix elements with momentum-boosted states and a nonlocal axial operator. The is performed one ensemble two degenerate light, strange charm quark (${N}_{f}=2+1+1$) maximally twisted mass fermions clover term. has volume ${32}^{3}\ifmmode\times\else\texttimes\fi{}64$ lattice spacing 0.0934 fm corresponds to...