Conveners
WG1 Structure functions and parton densities
- Amanda Cooper-Sarkar
WG1 Structure functions and parton densities
- Robert Thorne (University College London)
WG1 Structure functions and parton densities
- Markus Diehl (Deusches Elektronen-Synchrotron DESY)
WG1 Structure functions and parton densities
- Thomas Cridge (University of Manchester)
WG1 Structure functions and parton densities
- Paul Newman
WG1 Structure functions and parton densities
- Thomas Gehrmann (Universitรคt Zรผrich)
WG1 Structure functions and parton densities
- Pavel Nadolsky (Michigan State University)
WG1 Structure functions and parton densities
- Aurore Courtoy (Instituto de Fรญsica, UNAM)
WG1 Structure functions and parton densities
- Marco Bonvini (Istituto Nazionale di Fisica Nucleare)
WG1 Structure functions and parton densities
- Francesco Giuli (Istituto Nazionale di Fisica Nucleare)
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Pavel Nadolsky (Michigan State University)05/05/2026, 09:00WG1 Structure Functions and Parton DensitiesTalk
I present the final release of the CT25 family of precision parton distributions in the nucleon and discuss phenomenological implications of the wide-ranging CT25 analysis for collider predictions and determination of the QCD coupling constant.
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Felix Hekhorn (University of Jyvรคskylรค)05/05/2026, 09:20WG1 Structure Functions and Parton DensitiesTalk
We review progress and plans towards a new global PDF analysis from the NNPDF Collaboration. This new release will be based on state-of-the-art theory calculations, and in particular will be based on exact NNLO interpolation grids, (approximate) N3LO QCD corrections to DGLAP evolution and DIS structure functions, and QED effects to DGLAP evolution. All relevant sources of experimental and...
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Robert Thorne (University College London)05/05/2026, 09:40WG1 Structure Functions and Parton DensitiesTalk
We provide an update of the MSHT parton distribution functions. We concentrate
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on the impact of both new data sets and an improved theoretical and
statistical analysis for PDFs at high x values, including an investigation
of higher twist contributions. We also consider the potential impact of
Electron Ion Collider DIS data on PDFs, and in particular on the extraction
of the strong... -
Alberto Accardi (Christopher Newport U. and Jefferson Lab)05/05/2026, 10:00WG1 Structure Functions and Parton DensitiesTalk
We present the new CTEQ-JLab global QCD analysis, called CJ26, that simultaneously fits parton distribution functions of the proton and nuclear effects in deuteron targets. This work includes, for the first time in a global fit, the full set of JLab 6 GeV inclusive DIS measurements and the first published JLab 12 GeV data. The analysis focuses on the large-$x$ region, and carefully treats the...
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Marco Bonvini (Istituto Nazionale di Fisica Nucleare)05/05/2026, 11:00WG1 Structure Functions and Parton DensitiesFlash talk
Properly estimating theory uncertainties from missing higher orders is notoriously a challenging task. Controlling correlations among them is even more challenging. However, these correlations are crucially important for analysing experimental data.
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Building upon recent progress in the topic, we propose a novel approach that takes advantage of different methods to provide a reliable and... -
Aurore Courtoy (Instituto de Fรญsica, UNAM)05/05/2026, 11:10WG1 Structure Functions and Parton DensitiesFlash talk
We present a study of parametrization dependence in the construction of the CT25M PDF uncertainty prescription. This prescription is informed by preliminary analyses within the CT collaboration, including investigations of general polynomial approximators for PDF modeling, statistical interpretations of model combination, and characterization of the solution space via clustering and...
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Petja Paakkinen (CERN)05/05/2026, 11:20WG1 Structure Functions and Parton DensitiesFlash talk
We present a new extension to the toolbox of parton-distribution reweighting methods, which enables a general user to study the impact of an updated theory prediction on the results of a pre-existing parton-distribution global analysis. This new method is a combination of the well-known reweighting method with a new deweighting variant where a dataset is removed from the original analysis in...
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Valentina Schutze (University of Cambridge)05/05/2026, 11:30WG1 Structure Functions and Parton DensitiesFlash talk
Despite its ability to quantify uncertainties probabilistically and naturally accommodate theoretical constraints, Bayesian inference has so far played a limited role in PDF fitting. In this talk I will present Colibri, an open-source code that provides a general and flexible tool for PDF fits. The code is built so that users can implement their own PDF model, and use built-in functionalities...
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Aleksander Kusina (Institute of Nuclear Physics Krakow)05/05/2026, 11:40WG1 Structure Functions and Parton DensitiesTalk
We present the application of Makov Chain Monte Carlo (MCMC) method to analysis of parton distribution functions (PDFs). The MCMC approach naturally implements Bayes' theorem, hence provides a means to directly sample the underlying probability distribution - in this case the probability distribution of the PDF parameters. This allows for a straightforward propagation of the resulting...
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Min-Huan Chu (Adam Mickiewicz University, Poznaล)05/05/2026, 12:00WG1 Structure Functions and Parton DensitiesTalk
We propose a framework for the reconstruction of parton distribution functions (PDFs) and generalized parton distributions (GPDs) from lattice QCD, utilizing artificial neural networks (ANNs). Our approach combines two complementary methodologies: the Large Momentum Effective Theory (LaMET) and the short-distance operator expansion (SDE). To determine ANN-based PDFs and GPDs, we achieve a...
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Huey-Wen Lin (Michigan State University)05/05/2026, 12:20WG1 Structure Functions and Parton DensitiesTalk
The flavor asymmetry of the partonic sea offers important insight into the nonperturbative structure of hadrons and the underlying dynamics of QCD. Recent methodological advances in lattice QCD (LQCD) have enabled direct access to the Bjorken-x dependence of hadronic structure, overcoming the long-standing limitation of lattice calculations to a small number of distribution moments. In this...
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Emilio Taggi (Forschungszentrum Jรผlich, Bonn University)05/05/2026, 12:40WG1 Structure Functions and Parton DensitiesTalk
Using the standard tools of Euclidean lattice QCD, we present a determination of the third Mellin moments $\left<x^2\right>$ of nucleon's unpolarized, polarized and transversity parton distribution functions.
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Two lattice QCD ensembles at the physical pion mass are used: these were generated using a tree-level Symanzik-improved gauge action and $2+1$ flavor tree-level improved Wilson Clover... -
Misak Sargsian (Florida International University)05/05/2026, 14:30WG1 Structure Functions and Parton DensitiesTalk
We discuss recent extraction of parton distribution function of pion in the valence region
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which observed an unexpectedly soft $(1-x)^\beta$, $\beta\sim 1$ behavior, contradicting several theoretical predictions including the ones based on the hard
gluon exchange, according to which $\beta =2$. In this work we calculated the pion PDF within the theoretical approach based on spectral... -
Zoรซ Earnshaw05/05/2026, 14:50WG1 Structure Functions and Parton DensitiesTalk
Understanding meson structure through parton distribution functions (PDFs) remains a fundamental challenge in QCD. Existing pion PDF measurements rely on sparse, decades-old data from heavy nuclear targets, while kaon structure is constrained by only a few hundred events. Valence quark distributions have minimal experimental guidance, and sea quark and gluon content remain essentially...
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Dr Wally Melnitchouk (Jefferson Lab)05/05/2026, 15:10WG1 Structure Functions and Parton DensitiesTalk
We review recent results from the JAM Collaboration on pion and kaon PDFs obtained from global QCD analysis of experimental Drell-Yan and leading neutron electroproduction data, together with lattice QCD calculations of PDF moments and Ioffe time distributions. The analysis indicates a softer valence up-quark distribution in the $K^+$ compared with the $\pi^+$, and provides the first empirical...
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Madhav Chithirasreemadam (University of Jyvรคskylรค)05/05/2026, 15:30WG1 Structure Functions and Parton DensitiesTalk
Precise determination of the partonic structure of real photons has attracted renewed interest in view of ongoing studies of high-energy photon-induced processes in ultraperipheral collisions (UPCs) at the Large Hadron Collider (LHC) and at the future Electron-Ion Collider (EIC). Despite being fundamental in their own right and essential for QCD phenomenology of hard processes initiated by...
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Anna Stasto (Penn State University)05/05/2026, 15:50WG1 Structure Functions and Parton DensitiesTalk
Open charm and beauty production in photonuclear collisions offer a theoretically controlled way to study the dynamics of quarks and gluons in nuclei. In this talk, we present the first next-to-leading order predictions for the inclusive production of charmed mesons in ultraperipheral leadโlead collisions at the LHC, obtained with the new G$\gamma$AโFONLL framework. The framework relies on...
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Tomas Jezo (University of Mรผnster)05/05/2026, 16:45WG1 Structure Functions and Parton DensitiesTalk
We present a new global analysis of nuclear PDFs in the nCTEQ approach. Building on a modern proton baseline without nuclear data and extending the kinematic range, we combine and update previous separate analyses that focused on JLab neutral-current DIS, neutrino DIS and dimuon production, and the currently available LHC data, in particular on W/Z-boson and heavy-quark production. For the...
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Mr Jan Wissmann (University of Mรผnster)05/05/2026, 17:05WG1 Structure Functions and Parton DensitiesTalk
We present a dedicated analysis of nuclear PDFs that focuses on open heavy-flavour production in pA collisions. Using a larger heavy quark data set than in the baseline fit, we quantify the resulting constraints on nuclear PDFs, with particular sensitivity to the gluon modification in the shadowing region. We rely on perturbative QCD in the SACOT general-mass-variable-flavour-number scheme to...
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Prof. Shunzo Kumano (IMP/KEK)05/05/2026, 17:25WG1 Structure Functions and Parton DensitiesTalk
It has been assumed that nuclear modification does not exist in the longitudinal-transverse structure function ratio $R_N=F_L^N/(2xF_1^N)$ in lepton deep inelastic scattering. This assumption is widely used in obtaining structure functions of the ``nucleon" from nuclear data such as the deuteron ones. However, nuclear modifications do exist theoretically at least at medium- and large-$x$...
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Roberto Petti05/05/2026, 17:45WG1 Structure Functions and Parton DensitiesTalk
A quantitative explanation of the effects observed in nuclear DIS requires the presence of an in-medium nuclear modification of parton distribution functions, extending beyond the traditional Fermi motion and binding correction. We will discuss nuclear DIS basing on a microscopic model [1] taking into account the energy-momentum spectrum of bound nucleons, off-shell modification of bound...
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Yeonju Go (Brookhaven National Laboratory)06/05/2026, 09:00WG1 Structure Functions and Parton DensitiesTalk
The sPHENIX experiment is a next-generation collider detector at RHIC designed for rare jet and heavy flavor measurement in a variety of hadronic collision systems. The experiment includes large-acceptance, electromagnetic (EMCal) and hadronic (HCal) calorimeter systems, along with a very high-rate data acquisition plus trigger system. In RHIC Run-24, sPHENIX sampled 107/pb of p+p collision...
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Mr Wenhao Ma (University of Science and Technology of China)06/05/2026, 09:20WG1 Structure Functions and Parton DensitiesTalk
In studies of proton structure and global parton distribution function (PDF) analyses, the ratio of down to up quarks remains poorly constrained by experimental data. This is because the contributions of these two light quarks are typically entangled in physical processes and are difficult to disentangle in final-state observables. In this talk, we present a recently proposed method that...
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Zdenek Hubacek (Czech Technical University in Prague)06/05/2026, 09:40WG1 Structure Functions and Parton DensitiesTalk
LHC offers diverse means to investigate the fundamental properties of QCD in hard and soft regimes. This talk presents a few latest QCD results in ATLAS, covering precision scrutiny with single vector bosons, measurement of vector boson and flavored jets, measurement of di-jet events, as well as probe of minibias production in pO collisions.
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Bernd Surrow (Temple University)06/05/2026, 10:00WG1 Structure Functions and Parton DensitiesTalk
While the unpolarized valence quark ($d$ and $u$) distributions are well determined from DIS and $pp/p\bar{p}$ experiments, their sea (anti-)quark counterparts, $\bar{d}$ and $\bar{u}$, are much less constrained, in particular, near the valence region (momentum fraction, $x \sim 0.2$).
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Measurements of $W^+$ and $W^-$ production in $pp$ collider experiments can be used to probe the $\bar{d}$... -
Wally Melnitchouk (Jefferson Lab)06/05/2026, 10:20WG1 Structure Functions and Parton DensitiesFlash talk
We perform a global QCD analysis of unpolarized PDFs in the proton, including new $W+$charm production data from $pp$ collisions at the LHC and semi-inclusive pion and kaon production data in lepton-nucleon DIS, both of which have been suggested for constraining the strange quark PDF. Compared with a baseline global fit that does not include these datasets, the new analysis reduces the...
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Ville Alanko (University of Jyvรคskylรค)06/05/2026, 10:30WG1 Structure Functions and Parton DensitiesFlash talk
The simultaneous production of a $W^\mp$ boson and a charmed hadron $D^{(*)\pm}$ in proton-proton collisions, recently measured by ATLAS at $\sqrt{s} = 13$ TeV, offers a potential probe for constraining the strange quark distribution and studying strangeness asymmetry. By considering the production ratio of oppositely charged mesons, scale and fragmentation uncertainties become negligible. We...
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Jun Gao06/05/2026, 11:30WG1 Structure Functions and Parton DensitiesTalk
In this talk I will report recent progress on the NPC analysis of fragmentation functions of light charged hadron, including a next-to-next-to-leading order (NNLO) analysis, its implication for strange-quark PDFs, as well as a comparison to non-perturbative models. Furthermore, I will briefly introduce our recent calculations on SIDIS at N3LO in QCD.
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Marcin Stolarski (NCBJ)06/05/2026, 11:50WG1 Structure Functions and Parton DensitiesTalk
COMPASS has recently published results on pion and kaon colinear multiplicities measured on a proton target in Physical Review D 112 (2025) 012002. One of the key improvements over previous COMPASS analyses is a more accurate treatment of radiative corrections using the DJANGOH Monte Carlo generator. Compared to the previously used method, relative differences up to 10% are observed at the...
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Prof. Hayk Hakobyan (Universidad Tecnica Federico Santa Maria)06/05/2026, 12:10WG1 Structure Functions and Parton DensitiesTalk
Studying hadronization - the process by which quarks and gluons transition into hadrons -is fundamental to understanding the strong interaction dynamics within quantum chromodynamics (QCD). Using the CLAS12 detector at Jefferson Lab, the Run Group E (RGE) experiment offers unprecedented insights into hadronization in the nuclear medium. This talk will present preliminary results from the...
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Tanishq Sharma (Michigan State University)06/05/2026, 12:30WG1 Structure Functions and Parton DensitiesTalk
I present the current status of the NNFF2.0 project, aimed at a next-generation determination of fragmentation functions within the NNPDF framework. The analysis incorporates recent NNLO calculations for inclusive hadron production in deep-inelastic scattering and hadronโhadron collisions, and exploits exact NNLO theory predictions rather than K-factor approximations. On the methodological...
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Thomas Gehrmann (Universitรคt Zรผrich)06/05/2026, 14:30WG1 Structure Functions and Parton DensitiesTalk
The production of identified hadrons in lepton-nucleon scattering (semi-inclusive deep inelastic scattering, SIDIS) allows for detailed analyses of parton distributions and fragmentation functions.
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For polarised nucleons, the spin structure of the nucleon target can be proved to a more detailed level than through fully inclusive processes.
We present our calculations of the full set of... -
Sami Yrjรคnheikki (University of Jyvรคskylรค)06/05/2026, 14:50WG1 Structure Functions and Parton DensitiesTalk
Dimuon production in neutrino-nucleus collisions remains an important constraint of strangeness in nucleons. In most global analyses of proton and nuclear parton distribution functions, dimuon production is computed by assuming factorization to inclusive charm DIS production, an assumption that is valid only at leading order in the fixed-flavor number scheme. Our approach based on...
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Barbara Badelek (University of Warsaw)06/05/2026, 15:10WG1 Structure Functions and Parton DensitiesTalk
The proton structure function $F_2$ in the low $Q^2$, low $x$ region
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is constructed and analysed using the generalised vector meson
dominance representation with the large $Q^2$ spectral function
calculated from the analytic continuation of the parton model
structure function. This is an update of the work published in
Z. Phys.{\bf C}43 (1989) 251 and Phys. Lett. {\bf B} 295 (1992) 263,... -
Marco Bonvini (Istituto Nazionale di Fisica Nucleare)06/05/2026, 15:30WG1 Structure Functions and Parton DensitiesTalk
In the context of an ongoing project that aims to include the resummation of small x logarithms in the determination of the parton distributions of a muon, relevant for the description of scattering processes at a future muon collider, we have made significant progress in the resummation of splitting functions. We will describe some technical details and present new results.
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Thomas Cridge (University of Manchester)06/05/2026, 16:30WG1 Structure Functions and Parton DensitiesTalk
I will analyse the theoretical uncertainties inherent in the determination of the strong coupling from the transverse momentum (pT) spectrum of the Z boson. Such analyses require fine control of percent-level theoretical effects in small pT region, not only in terms of their magnitude but also of their shape and that of the corresponding theoretical uncertainties. This is theoretically...
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Jaco ter Hoeve (University of Edinburgh)06/05/2026, 16:50WG1 Structure Functions and Parton DensitiesFlash talk
We present a simultaneous determination of the strong coupling constant $\alpha_s(m_Z)$ and the top-quark mass $m_t$ within a global PDF analysis based on the public NNPDF framework. We consider a wide range of $t\bar{t}$ measurements, including both single- and double-differential observables, computed at NNLO QCD accuracy, and analyse their individual as well as combined impact on the joint...
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Tanishq Sharma (Michigan State University)06/05/2026, 17:00WG1 Structure Functions and Parton DensitiesFlash talk
Achieving percent-level accuracy and precision in parton distribution functions (PDFs) requires a careful optimization of the theoretical and methodological ingredients entering their determination. In this talk, we present a multidimensional correlation study based on multiple CT25 PDF fits at NNLO in QCD, aimed at investigating and quantifying the correlations among the strong coupling...
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Richard Whitehill (Old Dominion University / Jefferson Lab)06/05/2026, 17:10WG1 Structure Functions and Parton DensitiesTalk
We discuss the impact of neutral current parity-violating deep-inelastic scattering of electrons from proton and deuterium targets, planned in future measurements at Jefferson Lab, on the determination of the weak mixing angle, $\sin^2\theta_W$, and PDFs at large parton momentum fractions $x$. Using the JAM global QCD analysis framework, we perform a new analysis incorporating data simulated...
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Andrej Arbuzov (Joint Institute for Nuclear Research)06/05/2026, 17:30WG1 Structure Functions and Parton DensitiesTalk
The dependence of corrections due to the initial state radiation in electron-positron annihilation processes on the choice of the factorization scale is investigated. Different prescriptions of the factorization scale choice are analyzed within the leading and next-to-leading logarithmic approximations. Comparisons with the known complete two-loop results are used to optimize the scale choice.
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Mikko Seppรคlรค (University of Helsinki)06/05/2026, 17:50WG1 Structure Functions and Parton DensitiesTalk
We perform a two-loop calculation in Light Cone Perturbation Theory (LCPT) to evaluate the next-to-leading order nonsinglet splitting function. Our calculation demonstrates the methodology and feasibility of performing higher order calculations in LCPT. Since in Hamiltonian perturbation theory the longitudinal $k^+$ momentum is always positive, poles in $1/k^+$ can be regularized by a simple...
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Thomas Cridge (University of Manchester)06/05/2026, 18:10WG1 Structure Functions and Parton DensitiesTalk
With the increasing precision of PDF determinations, previously small effects require closer analysis. QED effects in PDFs are one such example, typically representing a percent effect, subtleties in their application can result in differences between the global PDF fitting groups. We analyse these and present the current status, as well as impacts on Higgs production cross-sections.
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Dr Francesco Giuli (Istituto Nazionale di Fisica Nucleare)07/05/2026, 09:00WG1 Structure Functions and Parton DensitiesTalk
We investigate the impact of recently computed N3LO corrections to QCD splitting and deep-inelastic scattering (DIS) coefficient functions on fits of parton distribution functions (PDFs) using the xFitter framework. By comparing fits performed at different perturbative orders, we analyze the resulting modifications to the PDFs and their associated uncertainties, incorporating correlated...
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Marco Guzzi (Kennesaw State University)07/05/2026, 09:20WG1 Structure Functions and Parton DensitiesTalk
In this talk, we discuss two aspects of the ongoing efforts of the CTEQโTEA group toward global parton distribution function (PDF) analyses beyond NNLO in QCD.
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First, we present the realization of an intermediate ACOT-like general-mass variable flavor number (GMVFN) scheme for deep-inelastic scattering (DIS) at approximate next-to-next-to-next-to-leading order (aN$^3$LO) in QCD. Using the DIS... -
Thomas Cridge (University of Manchester)07/05/2026, 09:40WG1 Structure Functions and Parton DensitiesTalk
We present an update of the MSHT20 approximate N^3LO PDFs. This is based on
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the inclusion of updated estimates of the N^3LO splitting functions and their
uncertanties, the final calculation of transition matrix elements and other
correponding theoretical improvements to the hard cross sections, particularly
for DIS data. We consider the impacts of the update on phenomeology at the LHC. -
Vasily Sotnikov (University of Zurich)07/05/2026, 10:00WG1 Structure Functions and Parton DensitiesTalk
Complete N3LO predictions require knowledge of the splitting functions at four loops. In this talk, I discuss our calculation of the four-loop non-singlet splitting functions from off-shell operator matrix elements.ย We obtain complete results with exact x-dependence for all non-singlet splitting functions and extract the virtual and rapidity anomalous dimensions in analytical form.
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Robert Schoefbeck07/05/2026, 11:00WG1 Structure Functions and Parton DensitiesTalk
The precise determination of the parton distribution functions (PDFs) of the proton is an essential ingredient for LHC analyses, including the upcoming High-Luminosity upgrade. PDFs are determined from a global scattering of hard scattering data taking as input unfolded low-dimensional binned cross- sections. In this work we demonstrate the feasibility of deploying neural simulation-based...
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Francesco Ventola (University of Hamburg)07/05/2026, 11:20WG1 Structure Functions and Parton DensitiesTalk
We derive threshold resummation of semi-inclusive deep-inelastic scattering (SIDIS), by building upon previous results by some of us for the resummation of the Drell-Yan process at fixed rapidity, which is related to SIDIS by crossing. We consider both a double-soft limit, in which both the Bjorken and the fragmentation scaling variables tend to their threshold value, and single soft limits in...
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Javier Jimรฉnez-Lรณpez07/05/2026, 11:40WG1 Structure Functions and Parton DensitiesTalk
We investigate the feasibility of a model-independent extraction of the proton structure functions $F_2$, $F_L$ and $xF_3$ at the future Electron-Ion Collider (EIC). The method relies on measurements of the reduced cross section at multiple beam energy configurations, corresponding to different center-of-mass energies. We study the impact of datasets composed of various combinations of beam...
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Stephen Maple (University of Birmingham)07/05/2026, 12:00WG1 Structure Functions and Parton DensitiesTalk
We explore the potential for extracting proton structure functions, proton parton density functions (PDFs), and the strong coupling $\alpha_s(M_z^2)$, using early science data from the future Electron-Ion Collider (EIC), both standalone, and in combination with HERA data. Different scenarios are considered in which samples with modest luminosity are collected at either two or three EIC beam...
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Dr Hamzeh Khanpour (AGH University of Krakรณw)07/05/2026, 12:20WG1 Structure Functions and Parton DensitiesTalk
We present a new global determination of the helicity-dependent parton distribution functions (PDFs) of the proton,
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based on inclusive deep-inelastic scattering (DIS) and semi-inclusive DIS (SIDIS) data within a consistent
next-to-leading order (NLO) QCD framework.
In addition to existing measurements, we incorporate simulated pseudodata for the future Electron-Ion Collider... -
Dr Juan Manuel Cruz Martinez (Universidad de Sevilla)07/05/2026, 12:40WG1 Structure Functions and Parton DensitiesTalk
We present a new public code, FPPDF, to perform global fits of parton distribution functions (PDFs). The fitting methodology follows that implemented by the MSHT collaboration, namely applying a fixed polynomial parameterisation of the PDFs and Hessian approach to error propagation, while for data and theory settings the libraries used by the NNPDF collaboration are taken. This therefore...
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