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11/05/2026, 10:15
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Alexei Prokudin (PSU Berks and Jefferson Lab)11/05/2026, 10:30
We present the first simultaneous global QCD analysis of unpolarized transverse momentum dependent (TMD) and collinear parton distribution functions (PDFs) in the proton. Our study incorporates data from deep-inelastic scattering, Drell-Yan, inclusive weak boson, W+ charm, and jet production involving PDFs, as well as TMD Drell-Yan and Z-boson production data from fixed target and collider...
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Haitao Li (Shandong University)11/05/2026, 11:00
Driven by the high-precision demands of the upcoming Electron-Ion Collider (EIC), this talk presents the computation of the next-to-next-to-next-to-leading order QCD corrections to the semi-inclusive deep-inelastic scattering (SIDIS) cross section. To systematically handle the intricate infrared singularities at this order, we introduce a novel two-dimensional transverse-momentum subtraction...
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22. An overview of parton and transverse distribution functions and the quark fragmentation functionBruno El-Bennich (Universidade Federal de São Paulo)11/05/2026, 11:30
I will present an overview of parton and transverse distribution functions and their relation to an elementary quark fragmentation function within a functional approach to QCD. Recent results on light and charm quark jet fragmentation functions will be presented.
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Prof. Vladimir Braun (University of Regensburg)11/05/2026, 12:30
We use conformal symmetry to calculate the NNLO anomalous dimension matrix (three loops) for flavor-singlet axial-vector QCD operators for spin N ≤ 8 from a set of gauge-invariant two-point correlation functions. Combining this result with the recent calculation of the two-loop coefficient functions, we carry out the calculation of the $\gamma^* \to \eta\gamma$ and $\gamma^*\to \eta'\gamma$...
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Asmita Mukherjee11/05/2026, 13:00
In this talk, I'll discuss the effect of TMD evolution on the Sivers asymmetry in almost back-to-back production J/psi and jet and J/psi and photon at the upcoming EIC.
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Narbe Kalantarians (Virginia Union University)11/05/2026, 13:30
Using charged lepton and neutrino scattering data in the deep-inelastic region, we have used the F2A structure function for a number of studies relevant to QCD. These data reside considerably in the regime of particular relevance to studies of the
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EMC Effect. Recently, we have been looking at (anti)shadowing region for the envisioned 20-22 GeV kinematic region. This talk will cover our work... -
Ángel Felipe Ballesteros (University of the Basque Country, Spain (UPV-EHU))11/05/2026, 15:30
Neutrinos constitute a powerful probe for determining Parton Distribution Functions (PDFs), owing to their flavor-dependent interactions with quarks. Historically, neutrino measurements have been limited, in part, by low statistics. However, recent experimental developments are opening a new era of high-statistics neutrino–nucleus interaction measurements with enhanced final-state...
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Sara Pontina (University of Turin)11/05/2026, 15:50
The mass of the W boson is a fundamental parameter of the Standard Model, providing a stringent test of its internal consistency. Its precise determination increasingly relies on measurements at hadron colliders, where effects related to nucleon structure and QCD corrections play a crucial role. Transverse Momentum Dependent (TMD) distributions offer a powerful framework to describe the...
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Alessia Bongallino (University of the Basque Country)11/05/2026, 16:10
We present MAPFF1.0_Lambda, the first global analysis at next-to-next-to-leading order in perturbative QCD of the collinear unpolarised fragmentation functions for $\Lambda$ production. The fit is based on data from single-inclusive electron-positron annihilation and semi-inclusive deep-inelastic scattering, and both neutral and charged-current processes are included for the latter. We have...
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Omar Elgedawy (CPHT, Ecole Polytechnique)11/05/2026, 16:30
Energy-energy correlators (EECs) have recently emerged as powerful, rigorously proven infrared- and collinear-safe (IRC-safe) observables for probing QCD dynamics in the vacuum. However, their IRC safety and factorization properties in the presence of a nuclear medium have never been established. In this talk, I will present the first proof of QCD factorization at next-to-leading order (NLO),...
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Bianka Mecaj (Los Alamos National Lab)11/05/2026, 16:50
In this work we present a first-principles analysis of the scale evolution of the two-point energy-energy correlator (EEC) for quark and gluon jets propagating through QCD matter. The EEC is a jet substructure observable that encodes the angular distribution of energy flow within jets and has proven valuable for precision tests of QCD in elementary collisions. Extending this framework to...
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Gustavo Barbosa Bopsin (Universidade Estadual Paulista / Ecole Polytechnique)11/05/2026, 17:10
In this work, we compute the pion parton distribution function (PDF) and its elementary and full fragmentation functions (FFs) using the Curci-Ferrari (CF) model. This model enables the exploration of nonperturbative Quantum Chromodynamics (QCD) effects by introducing a gluon-mass scale within the Landau gauge QCD Lagrangian. The resulting pion PDF and FFs computed with the CF quark propagator...
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Max Jaarsma (JGU Mainz)12/05/2026, 10:00
We present a factorization formula for the e + h → e + jet + X cross section at small transverse momenta up to next-to-leading power (NLP), derived using the background field method (BFM) with explicit inclusion of soft modes. We discuss the relation between soft modes and overlap subtractions at NLP, showing that the inclusion of soft modes enables a definition of twist-3 operators with...
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Umberto D'Alesio (University and INFN Cagliari)12/05/2026, 10:30
We present a phenomenological analysis of the Collins azimuthal asymmetries for pion-in-jet production in polarized $pp$ and $ep$ collisions within a TMD approach, adopting a collinear configuration for the initial state. To this aim, we employ the transversity and the Collins fragmentation functions as extracted from semi-inclusive DIS and $e^+ e^-$ annihilation processes.
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After comparing... -
Valerio Bertone (CEA Saclay)12/05/2026, 11:00
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Ian Balitsky (JLab/ODU)12/05/2026, 12:00
Within the framework of rapidity-only small-$x$ TMD factorization, the evolution with respect to the rapidity cutoff is governed initially by Sudakov double-logarithmic evolution, followed by single-logarithmic BFKL/BK evolution. The evolution equation proposed in this paper correctly reproduces both the Sudakov and BFKL limits and provides a consistent interpolation between these two regimes.
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Leonard Gamberg (Penn State University Berks)12/05/2026, 12:30
A unified description of the transverse-momentum spectrum in semi-inclusive deep-inelastic scattering (SIDIS) requires consistent matching between the low-$P_{hT}$ TMD regime and the high-$P_{hT}$ collinear regime. While this is well established at leading power for unpolarized structure functions, discrepancies arise at subleading power, where contributions may be phenomenologically...
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Andrea Signori (University of Turin and INFN)12/05/2026, 13:00
We present predictions for antiproton production cross sections in proton–proton collisions, which describe the interaction of cosmic rays with the interstellar medium. The aim of the project is to test a claimed excess in the production of secondary vs primary antiprotons in pp collisions against the QCD factorization framework. We quantify the uncertainties of the involved cross sections in...
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Ivan` Vitev (LANL)12/05/2026, 13:30
We use effective field theory to factorize production matrix elements that appear in the NRQCD framework for quarkonium cross sections. By applying a Hubbard–Stratonovich transformation and appropriate field redefinitions, we show that the soft and ultrasoft sectors of NRQCD can be decoupled from the heavy quark and antiquark fields in a hybrid vNRQCD/pNRQCD Lagrangian at leading order in the...
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Richard Whitehill (Old Dominion University)12/05/2026, 15:30
We discuss the semi-inclusive deep inelastic scattering (SIDIS) process from a phenomenological perspective, focusing especially on the unpolarized Breit frame transverse momentum spectrum and its associated azimuthal modulations. We find that experimental measurements of the large-$P_{h\perp}$ cross section and azimuthal asymmetries may constrain the theoretical uncertainties associated with...
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Francesca Lonigro (UAH Madrid)12/05/2026, 15:50
We investigate the inclusive hadroproduction of the pseudoscalar heavy-quarkonium mesons at high transverse momentum, focusing on the 13 TeV LHC energy scale. Our theoretical approach relies on the single-parton collinear factorization framework, where the formation of the heavy-quark bound state is described through Non-Relativistic QCD (NRQCD) at the initial scale at NLO. Central to this...
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Alessio Carmelo Alvaro (University of Pavia and INFN Pavia)12/05/2026, 16:10
A fundamental ingredient for phenomenological studies of the three-dimensional (3D) momentum structure of the nucleon is provided by matching relations. These relations constrain the functional form of 3D parton distributions by connecting them to their collinear counterparts. For quark transverse-momentum–dependent distributions (TMDs), matching relations are known at one-loop accuracy,...
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Patricia Andrea Gutiérrez García (Universidad Complutense de Madrid)12/05/2026, 16:30
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David PEREZ (IJCLab, Orsay)12/05/2026, 16:50
In this talk, we consider the exclusive photoproduction of a di-meson pair with large invariant mass, $\gamma N \rightarrow N' M_1M_2$, in the framework of collinear factorisation. The mesons considered $M_1$ and $M_2$ are either pions or rho mesons, charged or neutral. We consider the kinematic regime characterised by a large invariant mass of the two-meson system, and a small deflection of...
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Rong-Jun Fu (Fudan University)12/05/2026, 17:10
We present a theoretical study of the azimuthal decorrelation $\delta\phi$ and transverse momentum imbalance $q_T$ in dijet production at the LHC, offering intriguing insights into the dynamics of quantum chromodynamics. We define the jet axes using the recoil-free winner-take-all (WTA) recombination scheme. For the azimuthal decorrelation $\delta\phi$, this axis choice eliminates non-global...
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Magnus Bertilsson (University of Jyväskylä)12/05/2026, 18:00
Predictions for the inclusive DIS total cross section at small $x$ are commonly obtained using the forward elastic scattering amplitude in the dipole picture. However, the usual dipole picture assumes an asymptotically large photon-proton center-of-mass energy $W$, such that the phase space of the produced partonic system at the unitarity cut remains unconstrained. In this work, we move away...
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Thomas Clark (University of Manchester)12/05/2026, 18:20
Jet vetoes are important tools that can be used to separate hard processes. A commonly used variable in which jets are identified and vetoed is the transverse-momentum of a jet. Experimentally, reconstructing small transverse momentum jets at forward rapidities is challenging, which motivates introducing a cut on a jets rapidity to reduce sensitivity to this region. Existing SCET leading-jet...
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Shen Fang (Fudan University)12/05/2026, 18:40
We present the first complete calculation of hadron production in deep-inelastic scattering (DIS) at finite transverse momentum to next-to-next-to-leading order (NNLO) in perturbative QCD.
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To overcome the long-standing challenge of infrared divergences in semi-inclusive processes with identified final state hadrons at finite transverse momentum, we implement the recently developed... -
Juan José Gálvez Viruet (Univ. Complutense de Madrid)13/05/2026, 15:30
The real-time phenomenology of interacting quarks and gluons remains largely beyond the reach of computational techniques based on stochastic methods due to the fermionic sign problem. As a consequence, simulations of parton dynamics—particularly their transformation into final-state hadrons through fragmentation and hadronisation—are currently not feasible with these approaches.
In this...
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William Good (Michigan State University)13/05/2026, 15:50
We perform the first global QCD analysis of parton distribution functions (PDFs) in the pion, with lattice-QCD data on gluonic pseudo--Ioffe-time distributions fitted simultaneously with experimental Drell-Yan and leading neutron electroproduction data. Inclusion of the lattice results with parametrized systematic corrections significantly reduces the uncertainties on the gluon PDF at parton...
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Andrea Schiavi13/05/2026, 16:10
Within light-front quantization, hadrons can be represented on a Fock-space basis of configurations of elementary partons. The coefficients of the expansion are called light-front wave functions (LFWFs), and encode all the dynamical degrees of freedom. We show how to extract the LFWFs of baryons, such as the proton, from equal-time correlators suitable for Lattice QCD simulations. Using an...
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Bao-Dong Sun (Ruhr University Bochum)13/05/2026, 16:30
Score-based diffusion models are applied to two-dimensional SU(2) lattice pure gauge theory with the Wilson action, using a quaternion parameterization of the group manifold. Trained at a single coupling on an 8×8 lattice, the model generates configurations at different couplings via physics-conditioned sampling and generalizes to larger lattice sizes through a fully convolutional U-Net with...
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Asli Tandogan (University of Connecticut)13/05/2026, 16:50
Quasi-parton distribution functions (qPDFs) are defined through QCD fields at spacelike separations evaluated in matrix elements of hadrons moving with finite velocity $v$. In the limit $v \to 1$, qPDFs converge to standard parton distribution functions (PDFs). It is therefore instructive to study their properties and convergence in effective models. We present a general analysis of...
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Arturo Arroyo Castro (Universidad Complutense de Madrid)13/05/2026, 17:10
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LUCA POLANO (University of Pavia, Istituto Nazionale di Fisica Nucleare)13/05/2026, 18:00
Di-hadron Fragmentation Functions (DiFFs) provide a unique tool to probe the chiral-odd transversity parton distribution in a collinear framework. Current determinations of transversity using this approach are performed at leading-order (LO) accuracy, so achieving higher precision requires extending the extraction of DiFFs beyond LO. In this presentation, I will report a new extraction of the...
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Óscar del Río García (Universidad Complutense Madrid)13/05/2026, 18:20
This talk addresses the large-x behavior of Transverse Momentum Dependent distributions (TMDs) through the resummation of leading logarithmic corrections to their collinear matching coefficients. Rather than working at the process level, resummation is carried out directly within the TMD framework, thereby maintaining process-independence. A notable feature of this approach is its extension to...
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José Garrido (Federico Santa María Technical University)13/05/2026, 18:40
We discuss the new derivation of the linear but with complicated kernel and non-homogeneous evolution equations for the cross sections of productions of $n$-cut Balitsky-Fadin-Kuraev-Lipatov (BFKL) Pomerons in the final states of high energy DIS on a nucleus, resumming all multiple rescatterings and all leading logarithms of energy. These equations coincide with the equations that have been...
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José Rodríguez Quintero (Universidad de Huelva)14/05/2026, 10:00
Parton distribution functions (PDFs) are defining expressions of hadron structure. Exploiting the role of effective charges in quantum chromodynamics, an algebraic scheme is described which, given any hadron's valence parton PDFs at the hadron scale, delivers predictions for all its PDFs (unpolarized and polarized) at any higher scale. The scheme delivers results that are largely independent...
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Jacob Schönleber (Technical University Munich)14/05/2026, 10:30
Individual multi-loop diagrams for the massive Sudakov form factor contain an infinite tower of ultra-collinear momentum regions. We show that, for the on-shell form factor in QCD, these contributions cancel to all orders as a consequence of gauge invariance, so the leading-power SCETII factorization formula is unchanged. Using the η rapidity regulator, we compute the soft function and the...
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Daniel Boer (University of Groningen)14/05/2026, 11:00
Azimuthal modulations in electron-positron pair production in ultraperipheral collisions (UPCs) of gold ions have been observed by the STAR collaboration at RHIC. The modulations arise from the collisions of unpolarized and polarized photons emanating from the highly charged ions. In this talk the theoretical description in terms of Generalized Transverse Momentum Dependent parton...
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Cristian Pisano14/05/2026, 12:00
Transverse momentum dependent parton distribution functions (TMDs) encode essential information on the transverse motion of partons inside nucleons, as well as their spin-orbit correlations. In this talk I will show how, by looking at the azimuthal asymmetries in the inclusive production of pairs of vector quarkonia, one can probe different TMDs. In particular, quark and antiquark TMDs could...
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Filippo Delcarro (INFN Torino)14/05/2026, 12:30
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John Terry (LANL)14/05/2026, 13:00
We present a systematic study of nuclear-enhanced power corrections in deeply virtual Compton scattering (DVCS) on nuclear targets, extending techniques developed for inclusive deep inelastic scattering to exclusive processes. Using a light-cone operator product expansion and the method of regions, we identify coherent final-state interactions of the struck quark as the dominant source of...
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Dr Andrea Banfi (University of Sussex)14/05/2026, 13:30
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Giovanni Antonio Chirilli (National Centre for Nuclear Research (NCBJ), Warsaw)14/05/2026, 15:30
I show that the first sub-eikonal correction reproduces the standard quark and helicity light-ray operator structure of DIS and, in the inclusive limit, recovers the corresponding distributions at nonzero Bjorken $x_B$. I then derive dipole-form expressions for the corrections to $F_L$, $F_T$, and $g_1$, and identify the relevant operator combinations in the singlet and non-singlet...
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Oskar Grocholski (IRFU/CEA, France)14/05/2026, 16:00
We present our ongoing calculation of the next-to-leading order evolution equations for Generalized Parton Distributions (GPDs) in the flavour-non-singlet sector. We discuss the advantages and challenges associated with the use of the lightcone gauge. We show how the calculation can be automated using a set of analytically computable master integrals. The (spurious) rapidity divergences appear...
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Victor Martinez Fernandez (IRFU/CEA (France) and CFNS (USA))14/05/2026, 16:20
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 and, for the purposes of this talk, we are interested in the so-called generalized parton distributions (GPDs). These ones...
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Ignacio Castelli (Temple University)14/05/2026, 16:40
We present a one-loop perturbative study of unpolarized twist-two generalized parton distributions (GPDs) of quarks for external on-shell gluon states. A finite quark mass m is kept throughout the calculation and serves as an infrared regulator, allowing us to study the collinear limit of the GPDs. We also analyze this limit using dimensional regularization to regulate infrared divergences,...
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Marija Čuić (Irfu, CEA, Université Paris-Saclay/Aidas)14/05/2026, 17:00
Generalized Parton Distributions (GPDs) and the exclusive processes that probe them present an important insight into hadronic structure. However, extracting GPDs from experimental data constitutes a challenging inverse problem. In this work we revisit the Finite Elements Method (FEM) to study GPDs via their double distribution (DD) representation, focusing on the Radon transform that connects...
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Patrick Gotzler14/05/2026, 17:50
I introduce a new technique to calculate the conformal (Gegenbauer) moments of two-loop coefficient functions in DVCS and present selected results. These are necessary for GPD extractions within a Mellin-Barnes approach.
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Wanchen Li (Fudan University)14/05/2026, 18:10
We perform an analysis of the BK evolution equation formulated in momentum space, supplemented by higher-order resummation corrections motivated by renormalization group improvements and the kinematical constraints. The equation is solved over a wide range of transverse momenta and longitudinal momentum fractions using GPU-optimized numerical computation. The solutions are fitted to HERA data,...
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Patricia Gimeno-Estivill (University of Jyväskylä)14/05/2026, 18:30
We study the diffractive production of a massive quark pair in coherent photon-nucleus collisions within the Color Glass Condensate framework. We work in the correlation limit, where we explicitly distinguish between hard and semi-hard scales. In a first study, we consider the emission of an unmeasured semi-hard gluon with transverse momentum of the order of the saturation scale by the massive...
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Guillermo Portela Maller (Universidad Complutense de Madrid)14/05/2026, 18:50
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14/05/2026, 21:00
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Marco Zaccheddu (Jefferson Lab)15/05/2026, 10:00
The extraction of Transverse Momentum Dependent distributions (TMDs) from experimental data is a fundamental inverse problem in hadronic physics. Traditionally, this challenge is addressed by assuming specific analytical functional forms. However, these choices can introduce a parameterization bias and limit our ability to explore the full uncertainty of the results. In this talk, we present a...
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Adam Freese (Center for Nuclear Femtography)15/05/2026, 10:30
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Andrea Simonelli (Jefferson Lab and ODU)15/05/2026, 11:00
Extracting information on the three-dimensional structure of hadrons from transverse-momentum data is a challenging task, as it requires disentangling well-controlled perturbative contributions from genuinely non-perturbative effects, which are unavoidably influenced by phenomenological assumptions. This subtle interplay often obscures the interpretation of phenomenological analyses, even when...
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Owen Page (Pennsylvania State University)15/05/2026, 12:00
I investigate proton structure through the subleading observable called the Cahn effect. Equation of motion relations constrain the TMDs in the observable and relate them to leading power TMDs. I calculate the relevant functions and verify the equation of motion relation at LO and NLO in the strong coupling. In the calculation I show the cancelation of rapidity divergences using a novel...
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Dario Vaccaro (LIP Lisboa)15/05/2026, 12:20
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Guillaume Beuf (National Centre for Nuclear Research (NCBJ), Warsaw)15/05/2026, 12:40
In recent years, numerous studies have aimed at improving the precision of the theoretical description of the nonlinear QCD regime of gluon saturation in high-energy collisions, in order to match the precision of the data coming from the LHC and the future EIC. In particular, NLO QCD corrections have been calculated for many high-energy processes sensitive to gluon saturation.
In most of...
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Josep Rubi Bort (IFT)15/05/2026, 13:00
QCD–QG Duality and Discrete BFKL Evolution in Multi-Regge Kinematics We present a novel approach to computing duality relations between Quantum Chromodynamics (QCD) and Quantum Gravity (QG) in the Multi-Regge Kinematics (MRK) limit. This framework leverages Mathematica-based tools—FeynArts, FeynCalc, and FeynGrav—with a new implementation that integrates FeynGrav into FeynArts, enabling...
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