QCD@LHC 2026

Session

PDFs and DIS

28 Sept 2026, 14:00

University of Oxford

123. alphaS measurements from ATLAS

Gitanjali Poddar (University of London (GB))

PDFs and DIS

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This talk will cover recent ATLAS determinations of the strong coupling constant, $\alpha_s$, highlighting the increasingly important role of parton distribution functions in precision measurements.

120. Analaysis of the impact on data uncertanties with the MSHT framework

Dr Lucian Alexander Harland-Lang (University College London), Dr Matthew Reader (University College London), Robert Samuel Thorne (University College London (UK)), Thomas Cridge (University of Manchester)

PDFs and DIS

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We investigate the impact of modifications to the standard approach to data uncertainties in PDF fits in the context of the MSHT framework. We consider the potential for ``errors on errors'' and the consequence of this in data distributions and in fitting procedures. We also consider the degree of correlation in the treatment of correlated systematic uncertainties, and introduce a novel...

132. Constraining proton structure and deuteron effects at large x: the CJ26 global analysis

Matteo Cerutti (CEA Paris-Saclay)

PDFs and DIS

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We present CJ26, the latest CTEQ-JLab global QCD analysis, which simultaneously determines the proton parton distribution functions and nuclear corrections in deuteron targets. The analysis includes, for the first time in a global fit, the full JLab 6 GeV inclusive DIS dataset together with the first published measurements from the 12 GeV era. Focusing on the large-xx region, we examine the...

129. Designing Precision-Oriented PDF Sets for Electroweak Measurements at Hadron Colliders

Baris Tuncay (University of Oxford (GB))

PDFs and DIS

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Uncertainties associated with parton distribution functions (PDFs) remain among the dominant systematic uncertainties in precision measurements of the W boson mass. A robust assessment of PDF-related uncertainties is therefore essential for future combinations of $m_W$ measurements. Drell-Yan (DY) observables, including the Z boson rapidity $y_Z$ distribution, the W boson charge asymmetry...

113. Drell-Yan measurements with CMS for PDF determinations

Bhawna Gomber (University of Hyderabad, India)

PDFs and DIS

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Differential measurements of the Drell-Yan cross section play a central role in constraining the proton parton distribution functions (PDFs) while simultaneously enabling precision tests of perturbative QCD. Measurements spanning inclusive Drell-Yan production and final states in association with jets explore complementary regions of the parton momentum fractions and momentum-transfer...

121. Electroweak measurements at LHCb and their interplay with proton PDFs

Carlos Vazquez Sierra (Universidade da Coruña (ES))

PDFs and DIS

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The forward acceptance of the LHCb detector provides unique sensitivity to parton distribution functions in kinematic regions complementary to those probed by other LHC experiments. This talk reviews electroweak measurements at LHCb and their role in constraining proton structure. Particular attention is given to the interplay between PDF uncertainties and precision electroweak observables:...

92. Interpreting Parton Distributions with Shapley Values

Eva Groenendijk (University of Milan)

PDFs and DIS

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We present a new method to interpret PDFs using the game theoretical method of Shapley values. We use it to assess the impact of data on PDFs when determining them, and the impact of individual PDFs on collider observables. In general we recover the expected pattern of PDF sensitivity to data for modern global PDF sets. We also uncover pronounced localised losses of sensitivity that are not...

72. MORPH: Multimodal Observables and Representations for the Physics of Hadrons

Brandon Kriesten (Argonne National Laboratory)

PDFs and DIS

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Determining high-fidelity, flexible parameterizations of hadronic parton distribution functions from experimental data remains a long-standing goal in precision phenomenology. Traditionally, this problem is addressed through dedicated, large-scale global analyses spanning hundreds of experimental datasets and conditioned on underlying theory choices such as perturbative order, potential beyond...

25. MSHT: Updates

Dr Lucian Alexander Harland-Lang (University College London)

PDFs and DIS

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We provide an update of the MSHT parton distribution functions. We concentrate 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 coupling...

79. New Directions in Precision PDF Analysis

Timothy Hobbs (Argonne National Laboratory)

PDFs and DIS

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We present recent developments in the global analysis of the proton, including those within the CT25 family of precision parton distribution functions (PDFs) and related theoretical and methodological advances. Beyond the phenomenological implications of CT25 for collider predictions at the LHC and elsewhere, we also discuss novel approaches to nonperturbative parametrization and the growing...

90. On recent extractions of TMD distributions

Dr Valerio Bertone (C.E.A. Paris-Saclay)

PDFs and DIS

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In this talk, I will discuss the current status of TMD extractions.I will highlight recent progress, including neural-network parameterisations, applications to precision measurements of the strong coupling and the W boson mass, and the extraction of gluon TMDs from LHC data.

100. On the N3LO evolution of the PDFs from moments

Giulio Falcioni

PDFs and DIS

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The N3LO evolution of the PDFs is one of the required ingredients for percent-level precision phenomenology at the HL-LHC.
This talks reviews the progress in parameterising the evolution kernels by computing analytically a set of the moments of these quantities and imposing physical constraints.

99. Prospects for proton structure functions, PDFs, and strong coupling determinations at the EIC

Stephen Maple

PDFs and DIS

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Of the many measurements that will be possible at the Electron-Ion Collider (EIC), inclusive Deep Inelastic Scattering (DIS) measurements offer excellent opportunities to advance our understanding of the collinear structure of the proton, and QCD. We explore the potential for extracting proton structure functions, proton parton density functions (PDFs), and the strong...

91. Proton structure at the LHC with neural simulation-based inference

Robert Schoefbeck (Austrian Academy of Sciences (AT))

PDFs and DIS

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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...

112. Simultaneous PDF fits and parameter extractions (including weak mixing angle and alpha_s) at CMS

Bhawna Gomber (University of Hyderabad, India)

PDFs and DIS

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Simultaneous PDF fits and parameter extractions (including weak mixing angle and alpha_s) at CMS

98. Status of Nuclear PDF Determinations

Prof. Michael Klasen (University of Münster)

PDFs and DIS

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Nuclear parton distribution functions (nPDFs) are a key ingredient for precision studies of high-energy nuclear collisions. This talk will review the current status of global nPDF analyses, focusing on recent determinations including EPPS21, nNNPDF3.0, and nCTEQ26. We will discuss the impact of new experimental constraints, similarities and differences between the various fitting frameworks,...

24. Studies of N3LO corrections and resummation scale uncertainties in fits to DIS data using xFitter

Dr Francesco Giuli (INFN e Universita Roma Tor Vergata (IT))

PDFs and DIS

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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...

81. The 3-loop variable flavor number scheme

Prof. Johannes Bluemlein

PDFs and DIS

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We describe the variable flavor number scheme to three-loop order, which modifies
the massless parton densities by single- and two-mass effects and introduces heavy-quark
parton distribution functions for charm and bottom. A renormalization group analysis
shows the validity of this picture at large scales $Q^2$, where it resembles the
non-power-suppressed heavy-flavor corrections...

22. Towards the NNPDF4.1 global PDF analysis

Juan Rojo Chacon (Nikhef National institute for subatomic physics (NL))

PDFs and DIS

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We present NNPDF4.1, a new release of the NNPDF family that consolidates and extends theoretical, methodological, and experimental progress achieved since NNPDF4.0. On the theory side, predictions for hadron collider observables are now based on state-of-the-art NNLO calculations interfaced to fast interpolation grids, and the analysis systematically incorporates missing higher order...