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David Dean (TJNAF)5/19/25, 8:50 AM
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Zein-Eddine Meziani (Argonne National Laboratory)5/19/25, 9:00 AM
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Martha Constantinou (Temple University)5/19/25, 9:30 AM
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George Sterman (SBU)5/19/25, 10:00 AM
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Daniel Pitonyak (Lebanon Valley College)5/19/25, 11:00 AM
High-energy collision processes where multiple hadrons are detected in the final state provide a rich structure to probe QCD dynamics. Establishing the correct quantum field-theoretic operator definition of multi-hadron fragmentation functions is critical in this regard. I will discuss the latest developments in the theory of multi-hadron fragmentation functions in interpreting them as number...
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Yang-Ting Chien (GSU)5/19/25, 11:30 AM
Jet angularity is a classic substructure observable which probes the angular distribution of jet constituents. While soft-drop grooming may suppress complicated contributions from wide-angle, soft radiation, the dependence on jet algorithm also limits the theoretical precision to higher accuracy. In this work we provide resummed calculations of flattened jet angularity which generalizes the...
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Kiminad Mamo (William and Mary)5/19/25, 2:00 PM
Generalized parton distributions (GPDs) are accessible through experimental processes such as deep virtual Compton scattering (DVCS) and deep virtual meson production (DVMP). Extracting GPDs directly from Compton form factors is complicated by the inherent ambiguity of deconvolution when parametrizing GPDs directly in momentum fraction $x$-space using double distributions. To overcome this...
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Fatma Aslan (JLab)5/19/25, 2:00 PM
We use the GUMP (Generalized Parton Distributions (GPDs) through Universal Moment Parametrization) framework, based on the conformal moments of GPDs, to perform a unified global analysis incorporating Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP) data. By performing simultaneous fits across these processes and incorporating Next-to-Leading Order (NLO)...
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Jakob Schoenleber (Brookhaven National Laboratory)5/19/25, 2:30 PM
We discuss all-order factorization for the virtual Compton process at next-to-leading power (NLP) in the $\Lambda_{\rm QCD}/Q$ and $\sqrt{-t}/Q$ expansion (twist-3), both in the double-deeply-virtual case and the single-deeply-virtual case. We use the soft-collinear effective theory (SCET) as the main theoretical tool. We conclude that collinear factorization holds in the double-deeply virtual...
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Kemal Tezgin5/19/25, 2:30 PM
In this talk, I will present an impact study of pseudo-data from the future Electron-Ion Collider (EIC) on nucleon tomography and Compton Form Factors (CFFs), based on detector simulations performed with the EICROOT package. The pseudo-data are generated using the EpIC Monte Carlo event generator, a flexible and modular framework for simulating a broad range of exclusive processes, including...
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Florian Hechenberger (Stony Brook University)5/19/25, 3:00 PM
We extend the formalism of Phys.Rev.Lett. 133 (2024) 24, 241901 to helicity generalized parton distributions (GPDs) with the skewness dependence modeled by t-channel exchanges of spin-j operators in AdS space. Based on the conformal moment expansion, the GPDs are obtained through Mellin-Barnes integrals which bypass the convolution problem and are valid for all values of the skewness...
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Panjsheeri Zaki5/19/25, 3:00 PM
Generalized parton distributions (GPDs) serve as indispensable tools in filling in the gaps of the angular momentum sum rules as well as mapping the partonic spatial structure of hadrons. In this work, we extend the utility of GPDs in mapping the proton’s spatial structure beyond the typical one-body partonic picture, obtainable through Fourier transformations of GPDs to impact parameter...
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Eric Moffat (Argonne National Lab)5/19/25, 4:00 PM
I will present recent progress on the extraction of GPDs from data utilizing machine learning.
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Bailing Ma (Argonne Natioinal Lab)5/19/25, 4:00 PM
Zero mode issue in the minus-minus component calculation of the transition form factors in the light-front dynamics Among the three forms of Hamiltonian dynamics Dirac proposed in 1949, the light-front dynamics (LFD) has the most kinematical Poincare operators. In particular, the longitudinal boost operator becomes kinematical in the LFD. The LFD has very distinct vacuum properties, leading to...
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Victor Martinez-Fernandez5/19/25, 4:30 PM
Quantum Chromodynamics (QCD) is the theoretical framework to study hadrons by means of their fundamental degrees of freedom, i.e.~quarks and gluons, collectively referred to as partons. QCD defines many types of distributions describing a given hadron in terms of partons. For the purposes of this talk, we are interested in the so-called generalized parton distributions (GPDs) which are...
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Brandon Kriesten (Argonne National Lab)5/19/25, 4:30 PM
Inverse problems are ubiquitous in hadron structure and tomography, where accurately characterizing uncertainties is crucial for unraveling new physics hiding within these uncertainties. In this new precision era of QCD, it is vital to create a translation between our physics and next generation AI/ML algorithms, using tools such as evidential deep learning and information-theoretic metrics to...
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Andrey Tarasov (North Carolina State University)5/20/25, 9:00 AM
I'll discuss calculation of the NLO corrections to the unpolarized quark TMDPDFs using the factorization scheme defined in arXiv:2311.16402. The scheme aims to take into account the all collinear twist content of the TMDPDFs in the region of large $b_\perp\lesssim\Lambda^{-1}_{QCD}$ and bridge together the limits of large and small-x. I'll discuss different aspects of this derivation including...
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Yuri Kovchegov (The Ohio State University)5/20/25, 9:30 AM
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Andrea Simonelli (ODU and JLAB)5/20/25, 10:00 AM
The spacetime structure underlying hadronic processes plays a
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central role in shaping their factorization properties. In many
important cases, the relevant dynamics unfold along two opposing
light-cone directions, and any deviation from the lightcone is commonly
assumed to be negligible at leading power. In this presentation, I will
demonstrate the significance of these off lightcone... -
Patrick Barry (Argonne National Lab)5/20/25, 11:00 AM
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Chiara Bissolotti (Argonne National Laboratory)5/20/25, 11:30 AM
We present the first extraction of transverse-momentum-dependent distributions of unpolarized quarks from experimental Drell-Yan data using neural networks to parametrize their nonperturbative part. We show that neural networks outperform traditional parametrizations providing a more accurate description of data. This work establishes the feasibility of using neural networks to explore the...
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Nathaly Santiesteban (University of New Hampshire)5/20/25, 12:00 PM
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John Terry (Los Alamos National Lab)5/20/25, 2:00 PM
In this talk, I will discuss recent advances in our ability to image parton distribution functions (PDFs) in bound nucleons. I will review topics from last year’s QCD Evolution workshop, such as methods for extracting nuclear-modified PDFs and TMDs. Additionally, I will discuss perturbative approaches that show how the evolution of TMD PDFs in Drell-Yan (p+A) collisions follows a BFKL...
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Matteo Cerutti (Hampton University and Jefferson Lab)5/20/25, 2:00 PM
The understanding of the three-dimensional internal structure of the proton has significantly been developed over the past few decades. In particular, the extraction of Transverse Momentum Dependent distributions (TMDs) from global fits of experimental data has now reached an impressive level of precision. In this talk, I will present first indications of flavor dependence emerging from the...
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Marston Copeland (Duke University)5/20/25, 2:30 PM
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Marco Zaccheddu (Jefferson Lab)5/20/25, 2:30 PM
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Alejandro Bris (Universidad Complutense Madrid)5/20/25, 3:30 PM
In this work we explore the possibilities to obtain the values of the CollinsSoper kernel and the strong coupling constant offered by what so far is the highest order result ever achieved in perturbation theory, that is for the energy correlators in the back-to-back limit at $N^4LL+N^3LO$.
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The cross-section was implemented within ARTEMIDE’s code, using the $\zeta$-prescription for the... -
Leonard Gamberg (Penn State Berks)5/20/25, 3:30 PM
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Sara Piloneta5/20/25, 4:00 PM
I will present the study of the DY and SIDIS structure functions within the TMD factorization theorem with the inclusion of Kinematic Power Corrections (KPCs). This new theory allows the description of previously theoretically inaccessible parts of the cross-section in a Lorentz invariant manner using only twist-two TMD distributions. Examples of application include Drell-Yan angular...
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Alessia Bongallino (Universidad del País Vasco UPV/EHU)5/20/25, 4:00 PM
In this talk I present a new determination of the unpolarised fragmentation functions (FFs) for Lambda production from single-inclusive e+e- annihilation, semi-inclusive deep-inelastic scattering and pp collisions data. The analysis is done at both next-to-leading order (NLO) and next-to-next-to-leading order (NNLO). We extract the unpolarised FFs defining a parametrisation in terms of a...
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Yixin Zhang (Shandong University)5/20/25, 4:30 PM
Study of the origin of transverse single-spin asymmetries has triggered the development of the twist-3 formalism and the transverse-momentum-dependent parton distribution functions (TMDs). Measurement of the azimuthal distribution of identified hadrons within a jet in transversely polarized hadronic interactions provides an opportunity to study the TMD physics in the final state, {\it i.e.},...
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Marie Boer (Virginia Tech)5/21/25, 9:00 AM
I would like to present recent work done for developing an event generator aimed at making projections for hard exclusive reactions such as Compton-like reactions and meson production, for JLab to EIC energies. We extended our framework to include new reactions (phi, gamma-meson...), radiative corrections, etc. In this talk we also would like to discuss the connections between this work and...
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Shohini Bhattacharya (University of Connecticut)5/21/25, 9:30 AM
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Yuxun Guo (Lawrence Berkeley National Lab)5/21/25, 10:00 AM
I will discuss some recent progresses in constraining the gravitational form factors (GFFs) of the proton via near-threshold heavy quarkonium production with next-to-leading order alpha_S corrections. Particularly, I will show with Bayesian inference that such processes provide important constraint on the gluonic GFFs as well as the quark GFFs whose contributions emerge at next-to-leading order.
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Zhite Yu (Jefferson Lab)5/21/25, 11:00 AM
I am going to present a new formulation of the azimuthal modulations in hard exclusive diffraction processes. These are crucial in the phenomenological extraction and separation of various generalized parton distributions (GPDs). Traditionally, GPDs could be extracted from angular modulations of the deeply virtual Compton scattering (DVCS) in the Breit frame. However, the Bethe-Heitler...
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Swagato Mukherjee (Brookhaven National Laboratory)5/21/25, 11:30 AM
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Ignacio Castelli (Physics Department, Temple University, Philadelphia)5/21/25, 12:00 PM
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 current for a gluon target, clarifying their connection with the axial anomaly. In so doing, we also reconsider classic results obtained in the context of the...
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Joe Karpie5/22/25, 9:00 AM
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Adam Freese (Jefferson Lab)5/22/25, 9:30 AM
Generalized parton distributions (GPDs) are functions of four variables, one of which is a renormalization scale. The functional dependence on this renormalization scale is fully determined by a renormalization group equation---or "evolution equation"---that can be derived from perturbative QCD. A fast numerical implementation of the scale evolution is vital to any global phenomenology effort....
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Gabriel Santiago (Center for Nuclear Femtography)5/22/25, 10:00 AM
Within the pseudo-PDF framework, we investigate the perturbative contributions to correlators that are used to study transverse momentum dependent parton distributions (TMDs) on the lattice. Our results contain the full perturbative corrections which arise as artifacts from performing the calculation for a Euclidean separation between the parton fields, as well as the corrections which yield...
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Bernd Surrow (Temple University)5/22/25, 11:00 AM
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Christopher Cocuzza (College of William & Mary)5/22/25, 11:30 AM
A new global QCD analysis by the JAM collaboration performs the first extraction of transversity PDFs and tensor charges using both the Transverse Momentum Distribution (TMD) and Dihadron Fragmentation Function (DiFF) channels simultaneously, including all currently available experimental data. Known theoretical constraints on transversity, namely, its small-$x$ asymptotic behavior and the...
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Harut Avagyan (Jefferson Lab)5/22/25, 12:00 PM
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Michael Wagman (FNL)5/22/25, 2:00 PM
Pion and nucleon operators with spin structures inspired by light-cone physics and perturbative QCD have recently been discovered to have kinematically enhanced ground-state overlap and signal-to-noise in lattice QCD calculations with large momentum. I will discuss the physics of these operators and exploratory lattice QCD results for parton structure functions using these new operators.
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Charles Joseph Naїm (Stony Brook University (CFNS))5/22/25, 2:00 PM
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Christopher Chamness (The College of William & Mary)5/22/25, 2:30 PM
I will present on the extraction of disconnected contribution to the isoscalar matrix elements for light and strange quarks for the proton using Lattice QCD. While the connected contributions dominate the disconnected contributions are non-zero and must be considered to properly determine the matrix elements. In the case of the strange quark, there is no connected contribution, thus it is...
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Etienne Bianco5/22/25, 2:30 PM
We study dijet production in pA collisions at forward rapidities at next-to-eikonal accuracy. We restrict ourselves to the next-to-eikonal corrections that are induced by the quark background field of the target. Computing the scattering amplitudes, for all possible channels, in the back-to-back limit allows the study of leading twist quark TMDs in the high energy limit. We indeed express the...
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Oleh Fedkevych (Georgia State University)5/22/25, 3:00 PM
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Alexandru Sturzu5/22/25, 4:00 PM
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Daniel Adamiak (Ohio State University)5/22/25, 4:00 PM
We apply the valence quark model to constrain the non-perturbative initial condition for the small-x helicity evolution. The remaining free parameters are constrained by performing a global analysis to the available polarized small-x deep inelastic scattering data. A good description of the world data is obtained with only 8 free parameters. The model parameters are tightly constrained by the...
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Yushan Su (UMD)5/22/25, 4:30 PM
Parton distribution functions (PDFs) at large $x$ are challenging to extract from experimental data, yet they are essential for understanding hadron structure and searching for new physics beyond the Standard Model. Within the framework of the large momentum $P^z$ expansion of lattice quasi-PDFs, we investigate large $x$ PDFs, where the matching coefficient is factorized into the hard kernel,...
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Xiang Gao (BNL&Tsinghua University)5/22/25, 4:30 PM
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Patrizia Rossi (Jefferson Lab)5/23/25, 9:00 AM
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Sebastian Grieninger (Stony Brook University)5/23/25, 9:30 AM
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Vladimir Braun (University of Regensburg)5/23/25, 10:00 AM
We calculate $(\sqrt{-t}/Q)^k $ and $(m/Q)^k$ power corrections with $k\le 4$, where $m$ is the target mass and $t$ is the momentum transfer, to several key observables in Deeply Virtual Compton Scattering (DVCS). We find that the power expansion is well convergent up to $|t|/Q^2\lesssim 1/4$ for most of the observables, but is naturally organized in terms of $1/(Q^2+t)$ rather than the...
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Ian Balitsky (JLab/ODU)5/23/25, 11:00 AM
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Yoshitaka Hatta (Brookhaven National Laboratory)5/23/25, 11:30 AM
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Carl Carlson (William & Mary)5/23/25, 2:00 PM
When electrons strike a proton or nuclear target, there is a regime where electroproduction of the highest momentum pion or rho mesons proceeds by a perturbatively calculable process. The process is not the leading twist fragmentation process but rather a higher twist process that produces kinematically isolated mesons. Our calculations demonstrate, that in conditions that can be expected at...
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Alberto Accardi (Christopher Newport U. and Jefferson Lab)5/23/25, 2:00 PM
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Richard Whitehill (Old Dominion University / Jefferson Lab)5/23/25, 2:30 PM
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Andrei Afanasev (GWU)5/23/25, 2:30 PM
Calculations of the QED corrections to semi-inclusive deep-inelastic scattering (SIDIS) are crucial for studies of the 3D structure of the nucleon at JLab and future Electron Ion Collider (EIC). Previously, the important role of two-photon exchange (TPE) was discovered for the studies of nucleon structure in elastic electron-proton scattering. Here, we address the role of TPE corrections on...
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Saraswati Pandey (Banaras Hindu University)5/23/25, 3:00 PM
From polarized Deep Inelastic scattering (DIS) asymmetries, and cross-section data, it is possible to extract the polarized structure functions g1 and g2. In the Parton model picture of proton, the structure function g1p is expressed in terms of g1p = ∆Σ + ∆G, the net quark and gluon helicity contributions to the proton spin. This spin structure function can also be used to understand the...
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Shaswat Tiwari (North Carolina State University)5/23/25, 3:00 PM
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Raj Kishore (IIT Bombay)
A proper transverse momentum-dependent (TMD) factorization for quarkonium production at low transverse momentum necessitates the convolution of the TMD parton distribution function (TMDPDF) with an additional transverse momentum-dependent function, known as the TMD shape function (TMDShF). We present a phenomenological study of the impact of the TMDShF on quarkonium production in...
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Daniel Kovner (William & Mary)
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Ignazio Scimemi (Universdad Complutense Madrid)
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George Sterman (SBU)
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Shunzo Kumano (KEK/J-PARC)
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Singh Ravi
We compute the contribution of the quark and gluon component of the energy-momentum tensor (EMT) to the angular momentum density in various decompositions. We use the light-front Hamiltonian technique, and a two-component formalism in light-front gauge, where the constrained degrees of freedom are eliminated. Instead of a nucleon, we consider a simple composite spin-1/2 state, namely a quark...
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Filippo Delcarro (University of Pavia)
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Mia Liu
Artificial Intelligence advancement in the last decade can boost the discovery potential in modern science experiments. Bringing AI to the data creation of large complex science instruments opens up new possibilities for discoveries that are currently inaccessible. To harness unprecedented data at current and future nuclear physics experiments, paradigm shifting search strategies and...
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Sudeep Saha
My work focuses on trying to understand the mechanical properties of nucleons, such as mass, angular momentum, pressure, and shear force distribution, in terms of their quark and gluon constituents. In this work, we calculate the pressure and shear force distributions using the matrix elements of the energy-momentum tensor, which can be parametrized in terms of gravitational form factors. We...
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