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The path to $\hbox {N}^3\hbox {LO}$ parton distributions
/ NNPDF Collaboration
We extend the existing leading (LO), next-to-leading (NLO), and next-to-next-to-leading order (NNLO) NNPDF4.0 sets of parton distribution functions (PDFs) to approximate next-to-next-to-next-to-leading order (aN$^3$LO). We construct an approximation to the N$^3$LO splitting functions that includes all available partial information from both fixed-order computations and from small and large $x$ resummation, and estimate the uncertainty on this approximation by varying the set of basis functions used to construct the approximation. [...]
arXiv:2402.18635; Nikhef-2023-020; TIF-UNIMI-2023-23; Edinburgh 2023/29.-
2024-07-03 - 59 p.
- Published in : Eur. Phys. J. C 84 (2024) 659
Fulltext: 2402.18635 - PDF; Publication - PDF;
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LO, NLO, and NNLO Parton Distributions for LHC Event Generators
/ Cruz-Martinez, Juan (CERN) ; Forte, Stefano (INFN, Milan ; Milan U.) ; Laurenti, Niccolo (INFN, Milan ; Milan U.) ; Rabemananjara, Tanjona R. (Vrije U., Amsterdam ; NIKHEF, Amsterdam) ; Rojo, Juan (Vrije U., Amsterdam ; NIKHEF, Amsterdam)
We present NNPDF4.0MC, a variant of the NNPDF4.0 set of parton distributions (PDFs) at LO, NLO and NNLO, with and without inclusion of the photon PDF, suitable for use with Monte Carlo (MC) event generators, which require PDFs to satisfy additional constraints in comparison to standard PDF sets. These requirements include PDF positivity down to a low scale $Q\sim 1$ GeV, smooth extrapolation in the very small and large $x$ regions, and numerically stable results even in extreme regions of phase space for all PDFs. [...]
arXiv:2406.12961; CERN-TH-2024-080; TIF-UNIMI-2024-4.-
2024-09-17 - 14 p.
- Published in : JHEP 2409 (2024) 088
Fulltext: document - PDF; 2406.12961 - PDF;
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Les Houches 2023: Physics at TeV Colliders: Standard Model Working Group Report
/ Andersen, J. (Durham U., IPPP) ; Assi, B. (Fermilab) ; Asteriadis, K. (Regensburg U.) ; Azzurri, P. (INFN, Pisa) ; Barone, G. (Brown U.) ; Behring, A. (CERN) ; Benecke, A. (Louvain U., CP3) ; Bhattacharya, S. (Wayne State U.) ; Bothmann, E. (Gottingen U.) ; Caletti, S. (Zurich, ETH) et al.
This report presents a short summary of the activities of the "Standard Model" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 12-30 June, 2023)..
arXiv:2406.00708 ; DESY-24-076 ; FERMILAB-CONF-24-0620-T.
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Photons in the proton: implications for the LHC
/ NNPDF Collaboration
We construct a set of parton distribution functions (PDFs), based on the recent NNPDF4.0 PDF set, that also include a photon PDF. The photon PDF is constructed using the LuxQED formalism, while QED evolution accounting for O(alpha), O(alpha alphas) and O(alpha^2) corrections is implemented and benchmarked by means of the EKO code. [...]
arXiv:2401.08749; TIF-UNIMI-2023-17; Edinburgh 2023/19; CERN-TH-2023-159.-
2024-05-28 - 32 p.
- Published in : Eur. Phys. J. C 84 (2024) 540
Fulltext: document - PDF; 2401.08749 - PDF;
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The intrinsic charm quark valence distribution of the proton
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Candido, Alessandro (INFN, Milan ; Milan U. ; CERN) ; Cruz-Martinez, Juan (CERN) ; Forte, Stefano (INFN, Milan ; Milan U.) ; Giani, Tommaso (Vrije U., Amsterdam ; NIKHEF, Amsterdam) ; Hekhorn, Felix (INFN, Milan ; Milan U. ; Jyvaskyla U. ; Helsinki U.) ; Magni, Giacomo (Vrije U., Amsterdam ; NIKHEF, Amsterdam) ; Nocera, Emanuele R. (Turin U.) ; Rojo, Juan (Vrije U., Amsterdam ; NIKHEF, Amsterdam) ; Stegeman, Roy (U. Edinburgh, Higgs Ctr. Theor. Phys.)
/NNPDF Collaboration
We provide a first quantitative indication that the wave function of the proton contains unequal distributions of charm quarks and antiquarks, i.e. a nonvanishing intrinsic valence charm distribution. [...]
arXiv:2311.00743; Edinburgh 2023/22; TIF-UNIMI-2023-28; Nikhef 2023-012,
CERN-TH-2023-196.-
2024-05-01 - 11 p.
- Published in : Phys. Rev. D 109 (2024) L091501
Fulltext: PDF;
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Response to "Parton distributions need representative sampling"
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Cruz-Martinez, Juan (CERN) ; Del Debbio, Luigi (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Forte, Stefano (INFN, Milan ; Milan U.) ; Kassabov, Zahari (Cambridge U., DAMTP) ; Nocera, Emanuele R. (Turin U.) ; Rojo, Juan (Vrije U., Amsterdam ; Nikhef, Amsterdam) ; Stegeman, Roy (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Ubiali, Maria (Cambridge U., DAMTP)
We respond to the criticism raised by Courtoy et al., in which the faithfulness of the NNPDF4.0 sampling is questioned and an under-estimate of the NNPDF4.0 PDF uncertainties is implied. [...]
arXiv:2211.12961 ; Edinburgh 2022/19 ; TIF-UNIMI-2022-21.
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Response to - Fulltext
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The PDF4LHC21 combination of global PDF fits for the LHC Run III
/ PDF4LHC Working Group Collaboration
A precise knowledge of the quark and gluon structure of the proton, encoded by the parton distribution functions (PDFs), is of paramount importance for the interpretation of high-energy processes at present and future lepton-hadron and hadron-hadron colliders. Motivated by recent progress in the PDF determinations carried out by the CT, MSHT, and NNPDF groups, we present an updated combination of global PDF fits: PDF4LHC21. [...]
arXiv:2203.05506; Edinburgh 2021/31; FERMILAB-PUB-22-121-QIS-SCD-T; MSUHEP-22-010,
Nikhef 2021-033; SMU-HEP-22-01.-
2022-07-05 - 94 p.
- Published in : J. Phys. G 49 (2022) 080501
Fulltext: jt - PDF; 2203.05506 - PDF; Publication - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
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