Andreas Metz
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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: Dihadron fragmentation framework for near-side energy-energy correlators
Dihadron fragmentation framework for near-side energy-energy correlators Open
We establish an approach to analyze the free hadron and transition (nonperturbative) regions of near-side energy-energy correlators (EECs) based on dihadron fragmentation functions (DiFFs). We introduce a (nonperturbative) function we call…
View article: Parton Distribution Functions and their Generalizations
Parton Distribution Functions and their Generalizations Open
This article is an introduction to parton distribution functions and their generalizations which describe the quark and gluon structure of hadrons, and can be measured in various high-energy scattering processes. We provide the theoretical…
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: LHCspin: a Polarized Gas Target for LHC
LHCspin: a Polarized Gas Target for LHC Open
The goal of the LHCspin project is to develop innovative solutions for measuring the 3D structure of nucleons in high-energy polarized fixed-target collisions at LHC, exploring new processes and exploiting new probes in a unique, previousl…
View article: Physics case for quarkonium studies at the Electron Ion Collider
Physics case for quarkonium studies at the Electron Ion Collider Open
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
A bstract In this work, we present a lattice QCD calculation of the Mellin moments of the twist-2 axial-vector generalized parton distribution (GPD), $$ \overset{\sim }{H}\left(x,\xi, t\right) $$ , at zero skewness, ξ , with multip…
View article: The Axial Current and Its Divergence
The Axial Current and Its Divergence Open
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: Perturbative results of matrix elements of the axial current and their relation with the axial anomaly
Perturbative results of matrix elements of the axial current and their relation with the axial anomaly Open
View article: Physics case for quarkonium studies at the Electron Ion Collider
Physics case for quarkonium studies at the Electron Ion Collider Open
The physics case for quarkonium-production studies accessible at the US Electron Ion Collider is described.
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: Perturbative results of matrix elements of the axial current and their relation with the axial anomaly
Perturbative results of matrix elements of the axial current and their relation with the axial anomaly Open
In the Standard Model of particle physics, the axial current is not conserved, due both to fermion masses and to the axial anomaly. Using perturbative quantum chromodynamics, we calculate matrix elements of the local and non-local axial cu…
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: First simultaneous global QCD analysis of dihadron fragmentation functions and transversity parton distribution functions
First simultaneous global QCD analysis of dihadron fragmentation functions and transversity parton distribution functions Open
We perform a comprehensive study within quantum chromodynamics (QCD) of dihadron observables in electron-positron annihilation, semi-inclusive deep-inelastic scattering, and proton-proton collisions, including recent cross section data fro…
View article: Transversity Distributions and Tensor Charges of the Nucleon: Extraction from Dihadron Production and Their Universal Nature
Transversity Distributions and Tensor Charges of the Nucleon: Extraction from Dihadron Production and Their Universal Nature Open
We perform the first global quantum chromodynamics (QCD) analysis of dihadron production for a comprehensive set of data in electron-positron annihilation, semi-inclusive deep-inelastic scattering, and proton-proton collisions, from which …
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: Number Density Interpretation of Dihadron Fragmentation Functions
Number Density Interpretation of Dihadron Fragmentation Functions Open
We present a new quantum field-theoretic definition of fully unintegrated dihadron fragmentation functions (DiFFs) as well as a generalized version for n-hadron fragmentation functions. We demonstrate that this definition allows certain su…
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: 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: 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: Shedding light on shadow generalized parton distributions
Shedding light on shadow generalized parton distributions Open
The feasibility of extracting generalized parton distributions (GPDs) from deeply-virtual Compton scattering (DVCS) data has recently been questioned because of the existence of an infinite set of so-called ``shadow GPDs'' (SGPDs). These S…
View article: First simultaneous global QCD analysis of dihadron fragmentation functions and transversity parton distribution functions
First simultaneous global QCD analysis of dihadron fragmentation functions and transversity parton distribution functions Open
We perform a comprehensive study within quantum chromodynamics (QCD) of dihadron observables in electron-positron annihilation, semi-inclusive deep-inelastic scattering, and proton-proton collisions, including recent cross section data fro…
View article: Erratum: One-loop matching for the twist-3 parton distribution <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mi>x</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> [Phys. Rev. D <b>102</b>, 034005 (2020)]
Erratum: One-loop matching for the twist-3 parton distribution [Phys. Rev. D <b>102</b>, 034005 (2020)] Open
Received 13 July 2023DOI:https://doi.org/10.1103/PhysRevD.108.039901Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain a…
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 …