Jack Dragos
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View article: Confirming the existence of the strong CP problem in lattice QCD with the gradient flow
Confirming the existence of the strong CP problem in lattice QCD with the gradient flow Open
We calculate the electric dipole moment of the nucleon induced by the QCD\ntheta term. We use the gradient flow to define the topological charge and use\n$N_f = 2+1$ flavors of dynamical quarks corresponding to pion masses of $700$,\n$570$…
View article: Expansion coefficient of the pseudo-scalar density using the gradient flow in lattice QCD
Expansion coefficient of the pseudo-scalar density using the gradient flow in lattice QCD Open
We use the Yang-Mills gradient flow to calculate the pseudo-scalar expansion coefficient $c_P^*(t_f)$. This quantity is a key ingredient to obtaining the chiral condensate and strange quark content of the nucleon using the Lattice QCD form…
View article: Towards a determination of the nucleon EDM from the quark chromo-EDM operator with the gradient flow
Towards a determination of the nucleon EDM from the quark chromo-EDM operator with the gradient flow Open
In this proceedings, we lay the foundation for computing the contribution of quark chromo-electric dipole moment (qCEDM) operator to the nucleon electric dipole moment. By applying the gradient flow technique, we can parameterize the renor…
View article: Improvements to Nucleon Matrix Elements within a θ Vacuum from Lattice QCD
Improvements to Nucleon Matrix Elements within a θ Vacuum from Lattice QCD Open
Using the gradient flow, we calculated the nucleon mixing angle $\alpha_N$ and the nucleon electric dipole moment (EDM) induced by the QCD $\theta$-term. To do so, we computed the topological charge, and the nucleon two-point and three-poi…
View article: Towards a determination of the nucleon EDM from the quark chromo-EDM operator with the gradient flow
Towards a determination of the nucleon EDM from the quark chromo-EDM operator with the gradient flow Open
In this proceedings, we lay the foundation for computing the contribution of quark chromo-electric dipole moment (qCEDM) operator to the nucleon electric dipole moment. By applying the gradient flow technique, we can parameterize the renor…
View article: Improvements to Nucleon Matrix Elements within a $θ$ Vacuum from Lattice QCD
Improvements to Nucleon Matrix Elements within a $θ$ Vacuum from Lattice QCD Open
Using the gradient flow, we calculated the nucleon mixing angle $α_{N}$ and the nucleon electric dipole moment (EDM) induced by the QCD $θ$-term. To do so, we computed the topological charge, and the nucleon two-point and three-point corre…
View article: Improvements to Nucleon Matrix Elements within a $\theta$ Vacuum from Lattice QCD
Improvements to Nucleon Matrix Elements within a $\theta$ Vacuum from Lattice QCD Open
Using the gradient flow, we calculated the nucleon mixing angle $\alpha_{N}$ and the nucleon electric dipole moment (EDM) induced by the QCD $\theta$-term. To do so, we computed the topological charge, and the nucleon two-point and three-p…
View article: Hadron Structure from the Feynman-Hellmann Theorem
Hadron Structure from the Feynman-Hellmann Theorem Open
The determination of hadronic form factors at large momentum transfers has been a challenging problem in lattice QCD simulations. Here we show how the Feynman-Hellmann method may be extended to non-forward matrix elements to calculate hadr…
View article: Improved determination of hadron matrix elements using the variational method
Improved determination of hadron matrix elements using the variational method Open
The extraction of hadron form factors in lattice QCD using the standard two- and three-point correlator functions has its limitations. One of the most commonly studied sources of systematic error is excited state contamination, which occur…