Fernanda Steffens
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View article: Generalized parton distributions from lattice QCD with asymmetric momentum transfer: Unpolarized quarks at nonzero skewness
Generalized parton distributions from lattice QCD with asymmetric momentum transfer: Unpolarized quarks at nonzero skewness Open
We extend the formalism of asymmetric frames of reference for generalized parton distributions (GPDs) to the case of nonzero skewness, i.e., including longitudinal momentum transfer. The framework, based on Lorentz-invariant amplitudes and…
View article: Generalized parton distributions from lattice QCD with asymmetric momentum transfer: Tensor case
Generalized parton distributions from lattice QCD with asymmetric momentum transfer: Tensor case Open
The calculation of generalized parton distributions (GPDs) in lattice QCD was traditionally done by calculating matrix elements in the symmetric frame. Recent advancements have significantly reduced computational costs by calculating these…
View article: First simultaneous global QCD analysis of kaon and pion parton distributions with lattice QCD constraints
First simultaneous global QCD analysis of kaon and pion parton distributions with lattice QCD constraints Open
We perform the first simultaneous global QCD analysis of pion and kaon parton distribution functions (PDFs), constrained by pion- and kaon-induced Drell-Yan (DY) and leading neutron electroproduction data, together with lattice QCD data on…
View article: Collins-Soper Kernel and Reduced Soft Function in Lattice QCD
Collins-Soper Kernel and Reduced Soft Function in Lattice QCD Open
We evaluate the Collins-Soper kernel and the reduced soft function in lattice QCD, incorporating $\mathcal{O}(α_s)$ matching corrections. The calculation relies on the evaluation of the quasi-transverse momentum-dependent wave function wit…
Generalized Parton Distributions from Lattice QCD with Asymmetric Momentum Transfer: Tensor Case Open
The calculation of generalized parton distributions (GPDs) in lattice QCD was traditionally done by calculating matrix elements in the symmetric frame. Recent advancements have significantly reduced computational costs by calculating these…
View article: Quark and Gluon Momentum Fractions in the Pion and in the Kaon
Quark and Gluon Momentum Fractions in the Pion and in the Kaon Open
We present the full decomposition of the momentum fraction carried by quarks and gluons in the pion and the kaon. We employ three gauge ensembles generated with Nf=2+1+1 Wilson twisted-mass clover-improved fermions at the physical quark ma…
View article: Quark and gluon momentum fractions in the pion and in the kaon
Quark and gluon momentum fractions in the pion and in the kaon Open
We present results on the momentum fraction carried by quarks and gluons in the pion and the kaon. We employ three gauge ensembles generated with $N_f=2+1+1$ Wilson twisted-mass clover-improved fermions with physical quark masses. We perfo…
View article: Moments of Axial-Vector GPD from Lattice QCD: Quark Helicity, Orbital Angular Momentum, and Spin-Orbit Correlation
Moments of Axial-Vector GPD from Lattice QCD: Quark Helicity, Orbital Angular Momentum, and Spin-Orbit Correlation Open
In this work, we present a lattice QCD calculation of the Mellin moments of the twist-2 axial-vector generalized parton distribution (GPD), $\widetilde{H}(x,ξ,t)$, at zero skewness, $ξ$, with multiple values of the momentum transfer, $t$. …
View article: Generalized parton distributions from the pseudodistribution approach on the lattice
Generalized parton distributions from the pseudodistribution approach on the lattice Open
Generalized parton distributions (GPDs) are key quantities for the description of a hadron’s three-dimensional structure. They are the current focus of all areas of hadronic physics—phenomenological, experimental and theoretical, including…
View article: Quark and gluon momentum fractions in the pion and in the kaon
Quark and gluon momentum fractions in the pion and in the kaon Open
We present the full decomposition of the momentum fraction carried by quarks and gluons in the pion and the kaon. We employ three gauge ensembles generated with $N_f=2+1+1$ Wilson twisted-mass clover-improved fermions at the physical quark…
View article: Generalized parton distributions from the pseudo-distribution approach on the lattice
Generalized parton distributions from the pseudo-distribution approach on the lattice Open
Generalized parton distributions (GPDs) are key quantities for the description of a hadron's three-dimensional structure. They are the current focus of all areas of hadronic physics -- phenomenological, experimental, and theoretical, inclu…
View article: Twist-3 axial GPDs of the proton from lattice QCD
Twist-3 axial GPDs of the proton from lattice QCD Open
In these proceedings, we summarize results from the first lattice-QCD calculation of the twist-3 axial quark GPDs for the proton using the large-momentum effective theory approach. The calculation is performed using one $N_f=2+1+1$ ensembl…
View article: Proton Helicity GPDs from Lattice QCD
Proton Helicity GPDs from Lattice QCD Open
First lattice QCD calculations of $x$-dependent GPD have been performed in the (symmetric) Breit frame, where the momentum transfer is evenly divided between the initial and final hadron states. However, employing the asymmetric frame, we …
View article: Proton Helicity GPDs from Lattice QCD
Proton Helicity GPDs from Lattice QCD Open
First lattice QCD calculations of $x$-dependent GPD have been performed in the (symmetric) Breit frame, where the momentum transfer is evenly divided between the initial and final hadron states. However, employing the asymmetric frame, we …
View article: Generalized parton distributions from lattice QCD with asymmetric momentum transfer: Axial-vector case
Generalized parton distributions from lattice QCD with asymmetric momentum transfer: Axial-vector case Open
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 calculations of matrix elements in asymmet…
View article: Unveiling Generalized Parton Distributions through the Pseudo-Distribution Approach
Unveiling Generalized Parton Distributions through the Pseudo-Distribution Approach Open
Understanding the intricate three-dimensional internal structure of the nucleon has been a long-standing challenge. The main quantitative tool to map out this structure are the generalized parton distributions (GPDs). In these proceedings,…
View article: Nonperturbative renormalization of asymmetric staple-shaped operators in twisted mass lattice QCD
Nonperturbative renormalization of asymmetric staple-shaped operators in twisted mass lattice QCD Open
Staple-shaped Wilson line operators are necessary for the study of transverse momentum-dependent parton distribution functions (TMDPDFs) in lattice QCD and beyond. In this work, we study the renormalization of such operators in the general…
Unveiling generalized parton distributions through the pseudo-distribution approach Open
Understanding the intricate three-dimensional internal structure of the nucleon has been a long-standing challenge. The main quantitative tool to map out this structure are the generalized parton distributions (GPDs). In these proceedings,…
View article: Generalized Parton Distributions from Lattice QCD with Asymmetric Momentum Transfer: Axial-vector case
Generalized Parton Distributions from Lattice QCD with Asymmetric Momentum Transfer: Axial-vector case Open
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 calculations of matrix elements in asymmet…
View article: Chiral-even axial twist-3 GPDs of the proton from lattice QCD
Chiral-even axial twist-3 GPDs of the proton from lattice QCD Open
This work presents the first lattice-QCD calculation of the twist-3 axialquark generalized parton distributions (GPDs) for the proton using the large-momentum effective theory approach. We calculate matrix elements with momentum-boosted pr…
View article: Moments of proton GPDs from the OPE of nonlocal quark bilinears up to NNLO
Moments of proton GPDs from the OPE of nonlocal quark bilinears up to NNLO Open
For the first time, we present a lattice QCD determination of Mellin moments of unpolarized generalized parton distributions (GPDs) of the proton from an analysis of the quasi-GPD matrix elements within the short-distance factorization fra…
View article: Chiral-even axial twist-3 GPDs of the proton from lattice QCD
Chiral-even axial twist-3 GPDs of the proton from lattice QCD Open
This work presents the first lattice-QCD calculation of the twist-3 axial quark GPDs for the proton using the large-momentum effective theory approach. We calculate matrix elements with momentum-boosted proton states and a non-local axial …
View article: Nonperturbative renormalization of asymmetric staple-shaped operators in twisted mass lattice QCD
Nonperturbative renormalization of asymmetric staple-shaped operators in twisted mass lattice QCD Open
Staple-shaped Wilson line operators are necessary for the study of transverse momentum-dependent parton distribution functions (TMDPDFs) in lattice QCD and beyond. In this work, we study the renormalization of such operators in the general…
View article: Moments of proton GPDs from the OPE of nonlocal quark bilinears up to NNLO
Moments of proton GPDs from the OPE of nonlocal quark bilinears up to NNLO Open
For the first time, we present a lattice QCD determination of Mellin moments of unpolarized generalized parton distributions (GPDs) of the proton from an analysis of the quasi-GPD matrix elements within the short-distance factorization fra…
View article: Generalized Parton Distributions from Lattice QCD
Generalized Parton Distributions from Lattice QCD Open
In recent years, there has been a breakthrough in lattice calculations of $x$-dependent partonic distributions. This encompasses also distributions describing the 3D structure of the nucleon, such as generalized parton distributions (GPDs)…
View article: Pseudoscalar-pole contributions to the muon $g-2$ at the physical point
Pseudoscalar-pole contributions to the muon $g-2$ at the physical point Open
Pseudoscalar-pole diagrams are an important component of estimates of the hadronic light-by-light (HLbL) contribution to the muon $g-2$. We report on our computation of the transition form factors $\mathcal{F}_{P \rightarrow \gamma^* \gamm…
GPDs in asymmetric frames Open
It is often taken for granted that Generalized Parton Distributions (GPDs) are defined in the "symmetric" frame, where the transferred momentum is symmetrically distributed between the incoming/outgoing hadrons. However, such frames pose c…
GPDs in asymmetric frames Open
It is often taken for granted that Generalized Parton Distributions (GPDs) are defined in the "symmetric" frame, where the transferred momentum is symmetrically distributed between the incoming/outgoing hadrons. However, such frames pose c…