Stefan Krieg
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View article: Exclusion of a diquark–anti-diquark structure for the lightest positive-parity charmed mesons
Exclusion of a diquark–anti-diquark structure for the lightest positive-parity charmed mesons Open
The nature of low-lying scalar and axial-vector charmed mesons has been debated for decades, with hadronic molecular and compact tetraquark models being prominent candidates. These two models predict quite different features for the access…
View article: Every Component Counts: Rethinking the Measure of Success for Medical Semantic Segmentation in Multi-Instance Segmentation Tasks
Every Component Counts: Rethinking the Measure of Success for Medical Semantic Segmentation in Multi-Instance Segmentation Tasks Open
We present Connected-Component (CC)-Metrics, a novel semantic segmentation evaluation protocol, targeted to align existing semantic segmentation metrics to a multi-instance detection scenario in which each connected component matters. We m…
View article: Exclusion of a diquark-antidiquark structure for the lightest positive-parity charmed mesons
Exclusion of a diquark-antidiquark structure for the lightest positive-parity charmed mesons Open
The nature of low-lying scalar and axial-vector charmed mesons has been debated for decades, with hadronic molecular and compact tetraquark models being prominent candidates. These two models predict quite different features for the access…
View article: Nucleon electromagnetic form factors at large momentum from Lattice QCD
Nucleon electromagnetic form factors at large momentum from Lattice QCD Open
Proton and neutron electric and magnetic form factors are the primary characteristics of their spatial structure and have been studied extensively over the past half-century. At large values of the momentum transfer $Q^2$ they should revea…
View article: Porting Lattice QCD benchmark to upcoming STX stencil/tensor accelerator
Porting Lattice QCD benchmark to upcoming STX stencil/tensor accelerator Open
View article: Single-particle spectrum of doped $$\textrm{C}_{20}\textrm{H}_{12}$$-perylene
Single-particle spectrum of doped $$\textrm{C}_{20}\textrm{H}_{12}$$-perylene Open
We present a Hamiltonian Monte Carlo study of doped perylene $$\textrm{C}_{20}\textrm{H}_{12}$$ described with the Hubbard model. Doped perylene can be used for organic light-emitting diodes (OLEDs) or as acceptor material in organ…
View article: Every Component Counts: Rethinking the Measure of Success for Medical Semantic Segmentation in Multi-Instance Segmentation Tasks
Every Component Counts: Rethinking the Measure of Success for Medical Semantic Segmentation in Multi-Instance Segmentation Tasks Open
We present Connected-Component~(CC)-Metrics, a novel semantic segmentation evaluation protocol, targeted to align existing semantic segmentation metrics to a multi-instance detection scenario in which each connected component matters. We m…
View article: Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution
Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution Open
Quark orbital angular momentum in the proton is evaluated via a Lattice QCD calculation of the second Mellin moment of the twist-3 generalized parton distribution $\widetilde{E}_{2T} $ in the forward limit. The connection between this appr…
View article: Single Particle Spectrum of Doped $\mathrm{C}_{20}\mathrm{H}_{12}$-Perylene
Single Particle Spectrum of Doped $\mathrm{C}_{20}\mathrm{H}_{12}$-Perylene Open
We present a Hamiltonian Monte Carlo study of doped perylene $\mathrm{C}_{20}\mathrm{H}_{12}$ described with the Hubbard model. Doped perylene can be used for organic light-emitting diodes (OLEDs) or as acceptor material in organic solar c…
View article: Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution
Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution Open
Quark orbital angular momentum in the proton is evaluated via a Lattice QCD calculation of the second Mellin moment of the twist-3 generalized parton distribution $\widetilde{E}_{2T} $ in the forward limit. The connection between this appr…
View article: Moments of nucleon unpolarized, polarized, and transversity parton distribution functions from lattice QCD at the physical point
Moments of nucleon unpolarized, polarized, and transversity parton distribution functions from lattice QCD at the physical point Open
The second Mellin moments ⟨x⟩ of the nucleon’s unpolarized, polarized, and transversity parton distribution functions are computed. Two lattice QCD ensembles at the physical pion mass are used: these were generated using a tree-level Syman…
View article: Second Moments of Nucleon Unpolarized, Polarized, and Transversity Parton Distribution Functions from Lattice QCD at the Physical Point
Second Moments of Nucleon Unpolarized, Polarized, and Transversity Parton Distribution Functions from Lattice QCD at the Physical Point Open
The second Mellin moments $\langle x\rangle$ of the nucleon's unpolarized, polarized, and transversity parton distribution functions are computed. Two lattice QCD ensembles at the physical pion mass are used: these were generated using a t…
View article: From Theory to Practice: Applying Neural Networks to Simulate Real Systems with Sign Problems
From Theory to Practice: Applying Neural Networks to Simulate Real Systems with Sign Problems Open
The numerical sign problem poses a seemingly insurmountable barrier to the simulation of many fascinating systems. We apply neural networks to deform the region of integration, mitigating the sign problem of systems with strongly correlate…
View article: From Theory to Practice: Applying Neural Networks to Simulate Real Systems with Sign Problems
From Theory to Practice: Applying Neural Networks to Simulate Real Systems with Sign Problems Open
The numerical sign problem poses a seemingly insurmountable barrier to the simulation of many fascinating systems. We apply neural networks to deform the region of integration, mitigating the sign problem of systems with strongly correlate…
View article: Nucleon electromagnetic form factors at large momentum transfer from lattice QCD
Nucleon electromagnetic form factors at large momentum transfer from lattice QCD Open
Nucleon form factors at large momentum transfer are important for understanding the transition from nonperturbative to perturbative QCD and have been the focus of experiment and phenomenology. We calculate proton and neutron electromagneti…
View article: Transverse momentum-dependent parton distributions for longitudinally polarized nucleons from domain wall fermion calculations at the physical pion mass
Transverse momentum-dependent parton distributions for longitudinally polarized nucleons from domain wall fermion calculations at the physical pion mass Open
Previous Lattice QCD calculations of nucleon transverse momentum-dependent parton distributions (TMDs) focused on the case of transversely polarized nucleons, and thus did not encompass two leading-twist TMDs associated with longitudinal p…
View article: Moments of Parton Distributions Functions from Lattice QCD at the Physical Point
Moments of Parton Distributions Functions from Lattice QCD at the Physical Point Open
We present a Lattice QCD calculation of the second Mellin moments of the nucleon axial, vector and tensor parton distribution functions (PDFs). The calculation is performed at the physical pion mass with two different lattice spacings, and…
View article: Quark spin-orbit correlations in the proton
Quark spin-orbit correlations in the proton Open
Generalized transverse momentum-dependent parton distributions (GTMDs) provide a comprehensive framework for imaging the internal structure of the proton. In particular, by encoding the simultaneous distribution of quark transverse positio…
View article: The Semimetal-Antiferromagnetic Mott Insulator Quantum Phase Transition of the Hubbard Model on the Honeycomb Lattice
The Semimetal-Antiferromagnetic Mott Insulator Quantum Phase Transition of the Hubbard Model on the Honeycomb Lattice Open
The Hubbard model on the honeycomb lattice undergoes a quantum phase\ntransition from a semimetallic to a Mott insulating phase and from a disordered\nto an anti-ferromagnetically phase. We show that these transitions occur\nsimultaneously…
View article: Exotic states in the $\pi D$ system
Exotic states in the $\pi D$ system Open
In this proceedings we consider several states, namely the $D^*_{s0}(2317)$, $D_{s1}(2460)$, $D^*_{0}(2300)$ and $D_{1}(2430)$, which appear to defy description as simple quark-antiquark pairs. Theoretical input from unitarized chiral pert…
View article: Mitigating the Hubbard Sign Problem with Complex-Valued Neural Networks
Mitigating the Hubbard Sign Problem with Complex-Valued Neural Networks Open
Monte Carlo simulations away from half-filling suffer from a sign problem that can be reduced by deforming the contour of integration. Such a transformation, which induces a Jacobian determinant in the Boltzmann weight, can be implemented …
View article: Exotics in the $\pi D$ system
Exotics in the $\pi D$ system Open
In this proceedings we consider several states, namely the $D^*_{s0}(2317)$, $D_{s1}(2460)$, $D^*_{0}(2300)$ and $D_{1}(2430)$, which appear to defy description as simple quark-antiquark pairs. Theoretical input from unitarized chiral pert…
View article: Exotics in the $πD$ system
Exotics in the $πD$ system Open
In this proceedings we consider several states, namely the $D^*_{s0}(2317)$, $D_{s1}(2460)$, $D^*_{0}(2300)$ and $D_{1}(2430)$, which appear to defy description as simple quark-antiquark pairs. Theoretical input from unitarized chiral pert…
View article: Antiferromagnetic character of the quantum phase transition in the Hubbard model on the honeycomb lattice
Antiferromagnetic character of the quantum phase transition in the Hubbard model on the honeycomb lattice Open
We provide a unified, comprehensive treatment of all operators that contribute to the anti-ferromagnetic, ferromagnetic, and charge-density-wave structure factors and order parameters of the hexagonal Hubbard Model. We use the Hybrid Monte…
View article: Confirmation of the existence of an exotic state in the $\pi D$ system
Confirmation of the existence of an exotic state in the $\pi D$ system Open
In recent years many candidates for states beyond the most simple realization of the quark model were found in various experiments around the world. However, so far no consensus exists on their structure, although there is strong evidence …
View article: Confirmation of the existence of an exotic state in the $πD$ system
Confirmation of the existence of an exotic state in the $πD$ system Open
In recent years many candidates for states beyond the most simple realization of the quark model were found in various experiments around the world. However, so far no consensus exists on their structure, although there is strong evidence …
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>P</mml:mi></mml:math>-wave nucleon-pion scattering amplitude in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Δ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1232</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> channel from lattice QCD
-wave nucleon-pion scattering amplitude in the channel from lattice QCD Open
We determine the $\\Delta(1232)$ resonance parameters using lattice QCD and the Lüscher method. The resonance occurs in elastic pion-nucleon scattering with $J^P=3/2^+$ in the isospin $I = 3/2$, $P$-wave channel. Our calculation is perform…
View article: Machine learning to alleviate Hubbard-model sign problems
Machine learning to alleviate Hubbard-model sign problems Open
Lattice Monte Carlo calculations of interacting systems on nonbipartite lattices exhibit an oscillatory imaginary phase known as the phase or sign problem, even at zero chemical potential. One method to alleviate the sign problem is to ana…
View article: Semimetal–Mott insulator quantum phase transition of the Hubbard model on the honeycomb lattice
Semimetal–Mott insulator quantum phase transition of the Hubbard model on the honeycomb lattice Open
We take advantage of recent improvements in the grand canonical Hybrid Monte\nCarlo algorithm, to perform a precision study of the single-particle gap in the\nhexagonal Hubbard model, with on-site electron-electron interactions. After\ncar…
View article: From Ji to Jaffe-Manohar orbital angular momentum in lattice QCD using a direct derivative method
From Ji to Jaffe-Manohar orbital angular momentum in lattice QCD using a direct derivative method Open
A lattice QCD approach to quark orbital angular momentum in the proton based on generalized transverse momentum-dependent parton distributions (GTMDs) is enhanced methodologically by incorporating a direct derivative technique. This improv…