Conveners
WG5 Spin and 3D-structure
- Matteo Cerutti
WG5 Spin and 3D-structure
- Tyler Kutz (Johannes Gutenberg University Mainz)
WG5 Spin and 3D-structure
- Matteo Cerutti
WG5 Spin and 3D-structure
- Jan Matousek (Charles University, Prague)
WG5 Spin and 3D-structure
- Jan Matousek (Charles University, Prague)
WG5 Spin and 3D-structure
- Matteo Cerutti
WG5 Spin and 3D-structure
- Tyler Kutz (Johannes Gutenberg University Mainz)
WG5 Spin and 3D-structure
- Jan Matousek (Charles University, Prague)
WG5 Spin and 3D-structure
- Matteo Cerutti
WG5 Spin and 3D-structure
- Tyler Kutz (Johannes Gutenberg University Mainz)
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Alessandro Bacchetta (Istituto Nazionale di Fisica Nucleare)05/05/2026, 09:00WG5 Spin and 3D StructureTalk
Recent results on the determination of transverse-momentumโdependent parton distributions obtained within the MAP collaboration will be presented. The focus will be on the flavor dependence of unpolarized TMDs and on updated extractions of the helicity TMD, highlighting the constraints provided by current experimental data and their phenomenological implications. The role of machine-learning...
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Richard Whitehill (Old Dominion University / Jefferson Lab)05/05/2026, 09:20WG5 Spin and 3D StructureTalk
Obtaining a unified description of the transverse-momentum spectrum of hadrons produced in SIDIS through the $W+Y$ construction has been a primary focus within the nuclear physics community the last few decades. A critical element of this framework is the matching between low- and high-$q_T$ structure functions. While some unpolarized SIDIS structure functions match consistently at leading...
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Marco Zaccheddu (Jefferson Lab)05/05/2026, 09:40WG5 Spin and 3D StructureTalk
The extraction of Transverse Momentum Dependent distributions (TMDs) from experimental observables represents a classic inverse problem in hadronic physics. Traditionally, this challenge is addressed by assuming specific analytical functional forms, which can introduce inherent parameterization bias and limit the exploration of the full epistemic uncertainty.
In this talk, we present a...
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Anna Martin (Istituto Nazionale di Fisica Nucleare)05/05/2026, 10:00WG5 Spin and 3D StructureTalk
Over more than 20 years of data taking, the COMPASS fixed-target experiment at the CERN SPS has devoted a major part of its programme to the study of nucleon structure using high-energy muon and pion beams and proton and deuteron targets. In particular, SIDIS measurements with transversely polarised and unpolarised targets, performed in a unique kinematic domain, have provided key insights...
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Susanna Costanza (Istituto Nazionale di Fisica Nucleare)05/05/2026, 10:20WG5 Spin and 3D StructureTalk
Semi-Inclusive Deep Inelastic Scattering (SIDIS) is a key component of the physics program of the future Electron--Ion Collider (EIC), providing multidimensional access to the internal structure of nucleons and nuclei. Through measurements of hadron transverse momentum and azimuthal modulations, SIDIS enables detailed studies of parton dynamics, transverse-momentum--dependent (TMD) structure...
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ZHUOYI PANG (National Centre for Nuclear Research, Warsaw)05/05/2026, 11:15WG5 Spin and 3D StructureTalk
In this talk, we introduce our recent work on the exclusive electroproduction of dijets. This process, only tentatively studied in the past, provides a novel way to probe generalized parton distributions (GPDs), and it may be within the reach of future colliders. We obtain the complete set of amplitude expressions at leading order (LO), allowing us to construct observables that are sensitive...
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Igor Korover (Tel Aviv University)05/05/2026, 11:35WG5 Spin and 3D StructureTalk
Deeply virtual electroproduction of neutral pions has emerged as an important experimental channel for exploring the protonโs structure through deeply virtual exclusive reactions. In this talk, I will present new measurements of deeply virtual ฯ^0 electroproduction based on a comprehensive analysis of data covering a wide kinematic range in Q2 and Bjorken x that are accessible at the CLAS12...
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Po-Ju Lin (National Central University)05/05/2026, 11:55WG5 Spin and 3D StructureTalk
Hard Exclusive Meson Production is a very promising reaction to access Generalized Parton Distributions. Measurement of the cross section for hard exclusive neutral pion muoproduction on the proton was performed at COMPASS in 2016 at the M2 beamline of the CERN SPS using 160 GeV/c longitudinally polarised positive and negative muon beams scattering off a 2.5 m long liquid hydrogen target....
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Hao Huang (IJCLab, CNRS-IN2P3)05/05/2026, 12:15WG5 Spin and 3D StructureTalk
The internal structure of nucleons remains a central challenge in hadronic physics, particularly in understanding how quarks and gluons contribute to their mass and spin. Introduced in the 1990s, the generalized parton distributions (GPDs) play a crucial role in providing multiple pieces of information to reveal these mysteries. Experimentally, GPDs can be accessed through the Compton Form...
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Gursimran Kainth (University of Connecticut)05/05/2026, 12:35WG5 Spin and 3D StructureFlash talk
Preliminary COMPASS results on the Deeply Virtual Compton Scattering (DVCS) cross section will be presented. They have been obtained from exclusive single-photon production by scattering the 160 GeV muon beams of the SPS M2 beamline off a 2.5 m long liquid hydrogen target. The recoil proton was measured in a barrel-shaped time-of-flight detector surrounding the target. The scattered muons ...
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Kamil Augsten (Czech Technical University in Prague)05/05/2026, 12:45WG5 Spin and 3D StructureFlash talk
Preliminary results on Spin Density Matrix Elements in hard exclusive muoproduction of $\phi$ mesons on the proton are presented. The measurements were performed at COMPASS using 160 GeV/c polarised positive and negative muon beams incident impinging on a liquid hydrogen target. The covered kinematic range is $5 < W < 17~\mathrm{GeV}$, $1.0 < Q^2 < 10.0~\mathrm{GeV}^2$, and $0.01 < p_T^2 <...
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Huey-Wen Lin (Michigan State University)05/05/2026, 14:30WG5 Spin and 3D StructureTalk
Generalized parton distributions (GPDs) provide a unified description of the three-dimensional structure of hadrons, encoding both spatial and momentum information. Their determination, however, remains a challenging inverse problem due to limited experimental constraints and theoretical complexities in their extraction. Recent advances in lattice QCD (LQCD) have made it possible to access the...
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Simonetta Liuti (University of Virginia)05/05/2026, 14:50WG5 Spin and 3D StructureTalk
I will present a neural-networkโbased framework for modeling generalized parton distributions, referred to as NNGPD, in which GPDs are represented as flexible functions constrained through physically motivated integral relations. This approach reflects the inverse-problem character of GPD phenomenology - without assuming a specific functional ansatz - where experimental and theoretical...
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Yu Jiao Zhu (Max-Planck Institute for Physics)05/05/2026, 15:10WG5 Spin and 3D StructureTalk
We introduce the spin-dependent proton energy correlator in both the current and target fragmentation regions. We also present a new result for the NNLO helicity DGLAP splitting function, finding a small discrepancy with existing results in the literature.
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Ravi Singh (Indian Institute of Technology Bombay)05/05/2026, 15:30WG5 Spin and 3D StructureTalk
We present a detailed investigation of the relativistic spatial structure of transverse angular momentum, including both orbital and intrinsic spin, and examine how these quantities are modified by boost effects. Using the quantum phase-space (Wigner) formalism, we begin with three-dimensional spatial distributions of transverse orbital angular momentum, intrinsic spin, and boost in an...
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Shuo lin (Shandong University)05/05/2026, 16:30WG5 Spin and 3D StructureTalk
We propose a novel strategy to systematically isolate the nucleonโs intrinsic non-perturbative three-dimensional structure by employing 0-jettiness to suppress initial-state radiation in transverse momentum-dependent (TMD) observables. Applying this method to transverse single spin asymmetries (SSAs) in $W_ยฑ$ and $Z_0$ boson production at RHIC, we demonstrate a substantial enhancement of the...
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Carlo Flore (Universitร di Cagliari e INFN, Sezione di Cagliari)05/05/2026, 16:50WG5 Spin and 3D StructureTalk
The production of light hadrons within jets in polarized $pp$ and $ep$ collisions represents a promising tool to probe transverse momentum dependent (TMD) effects. As for the TMD factorizable processes (Drell-Yan, semi-inclusive DIS and $e^+ e^-$ annihilation into hadron pairs), such a reaction shares common features with them, the presence of two ordered energy scales: a large one, the...
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Vendula Beneลกovรก (Charles University)05/05/2026, 17:10WG5 Spin and 3D StructureTalk
The COMPASS experiment plays an important role in studies of nucleon structure. Measurements performed in 2016โ2017 with an unpolarised liquid hydrogen target and a longitudinally polarised 160 GeV/$c$ muon beam provide a high-statistics data sample for the analysis of semi-inclusive deep-inelastic scattering, giving access to transverse-momentum-dependent parton distribution and fragmentation...
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Bassam Aboona (Texas A&M University)05/05/2026, 17:30WG5 Spin and 3D StructureTalk
We report a preliminary measurement of the Collins azimuthal asymmetry for identified charged pions within jets in transversely polarized proton--gold collisions at $\sqrt{s_{NN}}=200$ GeV using the Relativistic Heavy Ion Collider (RHIC) and recorded by the Solenoidal Tracker At RHIC (STAR) detector. In the Transverse-Momentum-Dependent (TMD) framework, the Collins modulation...
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Patrik Novotnรฝ (Weizmann Institute of Science (IL))05/05/2026, 17:50WG5 Spin and 3D StructureTalk
Protonโnucleus collisions at the LHC provide a powerful laboratory to investigate initial-state phenomena in heavy-ion physics. Fluctuations in the proton configuration can significantly modify its effective interaction strength, biasing estimates of event activity and, consequently, the inferred number of wounded nucleons in the Pb nucleus.
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In this context, dijets offer a particularly... -
Luca Polano (Istituto Nazionale di Fisica Nucleare)06/05/2026, 09:00WG5 Spin and 3D StructureTalk
Di-hadron Fragmentation Functions (DiFFs) represent a unique analyzing
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power to access the chiral-odd transversity parton distribution in a
collinear framework. Since present extractions of transversity through
this method are performed at leading-order (LO) accuracy, improving the
precision requires extracting DiFFs beyond LO. In this talk, I will
present a new extraction of the... -
Nilanga Wickramaarachchi (Duke University)06/05/2026, 09:20WG5 Spin and 3D StructureTalk
Two hadron production in semi-inclusive deep inelastic scattering is an
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important tool to probe nucleon structure and study hadronization. In
this talk, an overview of the observables accessible with dihadron
production will be given. Preliminary results from the CLAS12 experiment
at Jefferson Lab will be shown for the target spin and double spin
asymmetries from $\pi^+\pi^-$... -
David Kapukchyan06/05/2026, 09:40WG5 Spin and 3D StructureTalk
Transverse single spin asymmetries (TSSA) have been studied for some time to help understand proton substructure. Their study has led to new developments in the theory of nuclear structure to include not only the collinear momentum of partons but also their transverse momentum. These new frameworks, the transverse momentum dependent parton distribution functions (TMD) and the Twist-3 collinear...
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Patricia Andrea Gutierrez Garcia (Universidad Complutense de Madrid)06/05/2026, 10:00WG5 Spin and 3D StructureFlash talk
We explore the quark and the gluon sivers function which appear in the factorization theorem of dijet production in semi-inclusive deep inelastic scattering. We revise the unpolarized TMD case and state the possibility of re-defining the resummation method, altering the treatment of the corresponding evolution kernels. Studying the two resummation schemes we find strong dependence on gluon TMD...
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Jing Zhao (Shandong University)06/05/2026, 10:10WG5 Spin and 3D StructureTalk
We investigate semi-inclusive deep inelastic scattering off a tensor-polarized spin-1 target, focusing on the production of an unpolarized hadron. The differential cross section is parametrized in terms of 23 structure functions, depending on the target spin states and the azimuthal modulations of the detected hadron. Within the transverse-momentum-dependent (TMD) factorization framework, we...
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Kenshi Kuroki (Institute of Modern Physics, CAS)06/05/2026, 11:00WG5 Spin and 3D StructureTalk
The spin-1 deuteron possesses tensor-polarized structure functions that have no analogue in spin-1/2 hadrons, and an experimental program at JLab is being planned to explore this unique aspect of hadronic structure. In a few GeV$^2$ region of $Q^2$, higher-twist effects may become significant. In this work [1], we showed the first quantitative evaluation of the tensor-polarized twist-3 parton...
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Jakub Wagner (National Centre for Nuclear Research)06/05/2026, 11:20WG5 Spin and 3D StructureTalk
Coherent hard exclusive reactions on light nuclei offer access to their quark and gluon structure and provide a framework for three-dimensional nuclear tomography. We analyze deeply virtual Compton scattering on a helium-4 target, including leading-twist contributions as well as kinematical twist-3 and twist-4 effects. We present numerical estimates of cross sections and asymmetries for...
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Ivan Vitev (LANL)06/05/2026, 11:40WG5 Spin and 3D StructureTalk
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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Story Frantzen (Massachusetts Institute of Technology)06/05/2026, 12:00WG5 Spin and 3D StructureTalk
Since 2018, the CLAS12 experiment located in Hall B at Jefferson National Laboratory, Newport News, VA, USA has collected electron scattering data over a broad kinematic range at beam energies up to 10.6 GeV.ย A collaboration of CLAS12 physicists from Jefferson Lab, MIT, and Tel Aviv University is developing several analyses of CLAS12 data aimed at extracting new information on the quark and...
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Elouan Ferrand06/05/2026, 12:20WG5 Spin and 3D StructureTalk
Deeply Virtual Compton Scattering (DVCS) is a powerful tool to investigate the internal structure of hadrons in terms of Generalized Parton Distributions (GPDs). The Sullivan process, involving the exchange of a virtual pion from the protonโs meson cloud, offers a unique opportunity to access the three-dimensional structure of the pion at high energies. Since the pion plays a central role in...
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Li XU (Brookhaven National Laboratory)06/05/2026, 12:40WG5 Spin and 3D StructureTalk
Understanding the internal structure of nucleons remains a fundamental challenge in hadronic physics. Generalized Parton Distributions (GPDs) provide a universal framework to describe this structure by correlating the partons' longitudinal momentum with their transverse spatial distribution. This 3D imaging gives access to partonic angular momentum and helps address the long-standing proton...
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Minho Kim (Argonne National Laboratory)06/05/2026, 14:30WG5 Spin and 3D StructureTalk
In inclusive polarized lepton-nucleon deep-inelastic scattering, the twist-3 matrix element $d_2$ is defined as the third moment of a linear combination of the spin-structure functions $g_1$ and $g_2$. It is sensitive to quark-gluon correlations in the nucleon and has been interpreted as an average color Lorentz force acting on the struck quark, due to the remnant diquark system. While the...
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Win Lin (Stony Brook University)06/05/2026, 14:50WG5 Spin and 3D StructureTalk
The spin structure function $g_1$ is important for understanding the quark spin contribution to the overall spin of nucleons, which has been a long standing puzzle in nuclear physics. Through the $Q^2$ dependence of $g_1$, the structure function is also sensitive to the gluon spin contribution. In addition, it is important for testing the Bjorken sum rule and can provide a unique way of...
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Wally Melnitchouk (Jefferson Lab)06/05/2026, 15:10WG5 Spin and 3D StructureTalk
We perform a comprehensive global QCD analysis of spin-dependent PDFs, combining all available data on inclusive and semi-inclusive DIS, as well as inclusive weak boson and jet production in polarized $pp$ collisions, simultaneously extracting spin-averaged PDFs and fragmentation functions. Including recent Jefferson Lab DIS data at high $x$, together with subleading power corrections to the...
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Wanchen Li (Fudan University)06/05/2026, 15:30WG5 Spin and 3D StructureTalk
We propose a novel probe of the nucleon's transversity distribution, $h_1^q$, using the one-point energy correlator (OPEC), an infrared-and-collinear safe jet substructure observable. We demonstrate that in transversely polarized $p^{\uparrow}p$ collisions, the OPEC exhibits a single-spin asymmetry (SSA) with a clean $\sin(\phi_s - \phi_n)$ angular dependence. This method probes SSA over a...
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Ignacio Borsa (University of Tรผbingen)06/05/2026, 15:50WG5 Spin and 3D StructureTalk
We present new Monte-Carlo tools for precision phenomenology in longitudinally polarized scattering processes, providing next-to-leading order QCD predictions matched to parton showers (NLO+PS) within the POWHEG BOX framework for di-jet production in polarized protonโproton collisions and polarized deep inelastic scattering. The generators are designed to deliver fully differential predictions...
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Alexander Bazilevsky (Brookhaven National Laboratory)06/05/2026, 16:45WG5 Spin and 3D StructureTalk
After decommissioning in 2016, PHENIX continues releasing new results making significant contribution to our understanding of the nucleonโs spin structure on partonic level and parton dynamics within the polarized nucleon. In this talk we summarize the highlights of the PHENIX spin program from longitudinally and transversely polarized proton-proton collisions as well as from transversely...
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Ralf Seidl (RIKEN)06/05/2026, 17:05WG5 Spin and 3D StructureTalk
Sizeable Transverse Single Spin Asymmetries have been observed at large $x_{\mathrm{Feynman}}$ (TSSAs) since the mid-1970s with fixed-target experiments, and were confirmed at the Relativistic Heavy Ion Collider experiments up to higher energy. The TSSAs are an important probe for non-perturbative spin-momentum correlations both in initial- and final-state strong nuclear interactions. They are...
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Alexey Vladimirov06/05/2026, 17:25WG5 Spin and 3D StructureTalk
The twist-three parton distribution functions are given by quark-gluon-quark matrix elements, and encode quantum interference between quark-gluon-quark states. I present the determination of the genuine twist-3 distribution directly from experimental data. The analysis combines observables described by collinear and transverse-momentum-dependent factorization theorems within a unified global...
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Florian Hechenberger (Stony Brook University)06/05/2026, 17:45WG5 Spin and 3D StructureTalk
The gluon Sivers function (GSF) is a central object in the study of the proton's 3D structure, encoding the intrinsic correlation between gluon transverse momentum and the transverse spin of the nucleon. Beyond its importance for proton tomography, the GSF fundamentally links parton orbital angular momentum and single spin asymmetries to the spin-dependent Odderon, rendering it particularly...
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Alessio Carmelo Alvaro (Istituto Nazionale di Fisica Nucleare)06/05/2026, 18:05WG5 Spin and 3D StructureFlash talk
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-momentumโdependent distributions (TMDs), matching relations are known at one-loop accuracy,...
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Artur Hoghmrtsyan (A. I. Alikhanyan National Laboratory)07/05/2026, 09:00WG5 Spin and 3D StructureTalk
The COMPASS experiment at CERN has carried out an extensive SIDIS programme using a high-energy muon beam and polarised targets to investigate the transverse spin structure of the nucleon. In 2022, COMPASS collected data with a 160 GeV/$c$ muon beam and a transversely polarised deuteron target, complementing earlier measurements performed with a transversely polarised proton target. In SIDIS,...
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Siranush Asatryan (A. I. Alikhanyan National Science Laboratory)07/05/2026, 09:20WG5 Spin and 3D StructureFlash talk
Transverse-spin-dependent azimuthal asymmetries in semi-inclusive deep-inelastic scattering (SIDIS) provide access to transverse-momentum-dependent parton distributions and fragmentation functions. In 2022, COMPASS collected SIDIS data with a 160 GeV/$c$ muon beam and a transversely polarised deuteron target, complementing the earlier COMPASS measurements on the proton. We present an update of...
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343. Exploring the Deep Infrared Behavior of QCD through Transverse Momentum Dependent DistributionsAndrea Simonelli (Istituto Nazionale di Fisica Nucleare)07/05/2026, 09:30WG5 Spin and 3D StructureTalk
Transverse Momentum Dependent (TMD) parton densities are well-defined QCD operators, however their determination remains challenging due to the dominance of non-perturbative effects at low energy scales. As a consequence, the impact of phenomenological modeling is difficult to control and may lead to a misinterpretation of the information carried by experimental data.
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In this talk, the most... -
Jan Ferdyan (Jagiellonian University)07/05/2026, 09:50WG5 Spin and 3D StructureTalk
We study the Drell-Yan structure functions in $Z^0$ boson production within the $k_T$ factorization framework, with particular emphasis on the Lam-Tung relation. The NNLO predictions in collinear perturbative QCD underestimate the ATLAS measurement of the Lam-Tung structure function. We investigate impact of parton transverse momenta on description of this observable and the other Drell-Yan...
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Lorenzo Rossi (Istituto Nazionale di Fisica Nucleare)07/05/2026, 10:10WG5 Spin and 3D StructureTalk
In this talk, we present a detailed study of low-invariant-mass DrellโYan data over the full transverse-momentum spectrum. Our predictions consistently combine small-$q_T$ resummation up to N$^4$LL accuracy with fixed-order calculations at NNLO. In the very low-$q_T$ region, non-perturbative effects become relevant and are modeled through a minimal non-perturbative form factor. The parameters...
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Louis Moureaux (Universitรคt Hamburg)07/05/2026, 10:30WG5 Spin and 3D StructureTalk
The parton branching (PB) method allows using TMD evolution with standard Monte Carlo event generators, replacing the current approximate treatment of initial state radiation with a rigorous prediction from first principles. A key parameter of PB is the intrinsic $k_\mathrm T$, which governs the low-scale behaviour of the TMD. In its first extraction from collider data, tensions appeared...
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Mrs Anuja khanal (Temple University)07/05/2026, 11:15WG5 Spin and 3D StructureTalk
Transversity, $h_1^{q}(x)$, a leading twist parton distribution function, describes the transverse spin distribution of quarks in a transversely polarized proton. It is a fundamental component of nucleon spin structure and is loosely constrained by global fits. As a chiral odd function, $h_1^{q}(x)$ can only be accessed when coupled with another chiral odd partner, such as an interference...
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Jieke Wang07/05/2026, 11:35WG5 Spin and 3D StructureTalk
The spin correlations of $\Lambda$ hyperons offer a direct window into QCD spin dynamic, including spin-orbit coupling, polarization transfer during hadronization, and possible local spin entanglement in the fragmentation process. With the high-statistics data collected by the CMS experiment, we present the first spin correlation results for $\Lambda\Lambda$, $\Lambda\bar{\Lambda}$ and...
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Albi Kerbizi (Trieste University and INFN)07/05/2026, 11:55WG5 Spin and 3D StructureTalk
The string+3P0 model of spin-dependent hadronization is extended to include the production and decay of polarized spin-1/2 baryons alongside pseudoscalar and vector mesons, and it is implemented in the Pythia event generator for the simulation of deep inelastic scattering (DIS).
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The model is used to investigate the spontaneous polarization of lambda, antilambda and other hyperons produced in... -
Wen-Hao Yao (Shandong University)07/05/2026, 12:15WG5 Spin and 3D StructureTalk
Spin-dependent fragmentation functions encode essential information on the spin transfer from partons to hadrons and are typically studied in experiments with polarized beams. In particular, the longitudinal spin transfer $G_{1L}$ remains poorly constrained. In $Z^0/W^\pm$-tagged jet production, the parity violation of weak interaction induces a longitudinal polarization of the jet. This...
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Michael Fucilla07/05/2026, 12:35WG5 Spin and 3D StructureTalk
In recent years, growing attention has been devoted to the interface between collider physics and quantum information. A particularly intriguing direction is the exploration of quantum phenomena, such as entanglement, in high-energy scattering processes, including DIS at the EIC and ultraperipheral collisions at the LHC. In this context, we present the first study of spin--spin correlations in...
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