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  1. ; ; ; ; ; ; ; ; ; ; et al (, The European Physical Journal Plus)
    Abstract This report summarizes the latest developments in the CTEQ-TEA global analysis of parton distribution functions (PDFs) in the nucleon. The focus is on recent NNLO fits to high-precision LHC data at 8 and 13 TeV, including Drell–Yan, jet, and top-quark pair production, pursued on the way toward the release of the new generation of CTEQ-TEA general-purpose PDFs. The report also discusses advancements in statistical and numerical methods for PDF determination and uncertainty quantification, highlighting the importance of robust and replicable uncertainties for high-stakes observables. Additionally, it covers phenomenological studies related to PDF determination, such as the interplay of experimental constraints, exploration of correlations between high-xnucleon sea and low-energy parity-violating measurements, fitted charm in the nucleon, the photon PDF in the neutron, and simultaneous SMEFT-PDF analyses. 
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  2. ; ; ; ; ; ; ; ; (, Sissa Medialab)
    We discuss the impact of eligible top-quark pair production differential cross-section measurements at the LHC with a collision energy of 13 TeV on the parton distribution functions (PDFs) of the proton as well as the impact of approximate next-to-next-to-next-to-leading order (aN3LO) QCD corrections combined with next-to-leading order (NLO) electroweak (EW) corrections on tt¯ observables. We illustrate the effects on the gluon PDF at large x from an optimal baseline selection of data in NNLO global fits, and show comparisons between the theory prediction for tt¯ total and differential cross sections at aN3LO QCD combined with NLO EW and recent measurements from the ATLAS and CMS collaborations at the LHC. 
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    Free, publicly-accessible full text available January 3, 2026
  3. ; (, Physics Letters B)
    Free, publicly-accessible full text available January 1, 2026
  4. ; ; ; ; ; ; ; ; ; ; et al (, Sissa Medialab)
    We review recent studies by the CTEQ-TEA group toward the development of a new generation of precision parton distribution functions in the nucleon for advanced studies at the high-luminosity LHC and in other experiments. Among several ongoing e!orts, we examine sensitivity to the PDFs and mutual compatibility of new measurements in production of Drell-Yan pairs, top-quark pairs, and single-inclusive jets by the ATLAS, CMS, and LHCb collaborations in the LHC Runs 1 and 2. 
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    Free, publicly-accessible full text available December 27, 2025
  5. ; (, Sissa Medialab)
    Free, publicly-accessible full text available December 17, 2025
  6. (, Sissa Medialab)
    Free, publicly-accessible full text available December 17, 2025
  7. ; ; ; ; (, Physical Review D)
    We present a methodology to streamline implementation of massive-quark radiative contributions in calculations with a variable number of active partons in proton-proton collisions. The methodology introduces and heavy-quark parton distribution functions (PDFs) to implement calculations in the Aivazis–Collins–Olness–Tung (ACOT) factorization scheme and its simplified realization in various processes up to the next-to-the-next-to-leading order in the QCD coupling strength. Interpolation tables for bottom-quark subtraction and residual distributions for CT18 NLO and NNLO PDF ensembles are provided in the common LHAPDF6 format. A numerical calculation of Z -boson production with at least one b jet at the Large Hadron Collider beyond the lowest order in QCD is considered for illustration purposes. Published by the American Physical Society2024 
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    Free, publicly-accessible full text available December 1, 2025
  8. ; ; ; ; (, EPJ Web of Conferences)
    Bruno, GE; Chiodini, G; Colangelo, P; Corianò, C; Creanza, DM; De_Fazio, F; Giannuzzi, F; My, S; Nappi, E; Nicotri, S (Ed.)
    We present the application of the ACOT and S-ACOT general mass variable flavor number schemes to proton-proton collisions with particular attention to the production of final states with at least one heavy quark.Subtractionandresidualheavy-quark parton distribution functions are introduced to facilitate the implementation of this scheme at higher orders in perturbative QCD. The calculation ofZ-boson hadronic production with at least onebjet beyond the lowest order in QCD is considered for illustration purposes. 
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