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CERN Document Server 22 records found  1 - 10nextend  jump to record: Search took 0.58 seconds. 
1.
Combination of aN$^3$LO PDFs and implications for Higgs production cross-sections at the LHC / MSHT Collaboration
We discuss how the two existing approximate N$^3$LO (aN$^3$LO) sets of parton distributions (PDFs) from the MSHT20 and NNPDF4.0 series can be combined for LHC phenomenology, both in the pure QCD case and for the QCD$\otimes$QED sets that include the photon PDF. [...]
arXiv:2411.05373 ; DESY-24-134 ; TIF-UNIMI-2024-17 ; Edinburgh 2024/9 ; CERN-TH-2024-167. - 22.
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2.
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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3.
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SIMUnet / Ubiali, Maria (speaker) (University of Cambridge (GB))
2024 - 1890. Open meetings; 7th General Meeting of the LHC EFT Working Group External links: Talk details; Event details In : 7th General Meeting of the LHC EFT Working Group
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4.
Determination of the theory uncertainties from missing higher orders on NNLO parton distributions with percent accuracy / NNPDF Collaboration
We include uncertainties due to missing higher order corrections to QCD computations (MHOU) used in the determination of parton distributions (PDFs) in the recent NNPDF4.0 set of PDFs. We use our previously published methodology, based on the treatment of MHOUs and their full correlations through a theory covariance matrix determined by scale variation, now fully incorporated in the new NNPDF theory pipeline. [...]
arXiv:2401.10319; TIF-UNIMI-2023-22; Edinburgh 2023/34; CERN-TH-2024-009.- 2024-05-21 - 23 p. - Published in : Eur. Phys. J. C 84 (2024) 517 Fulltext: document - PDF; 2401.10319 - PDF;
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5.
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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6.
Focus topics for the ECFA study on Higgs / Top / EW factories / de Blas, Jorge (Granada U.) ; Koppenburg, Patrick (Nikhef, Amsterdam) ; List, Jenny (DESY) ; Maltoni, Fabio (Louvain U.) ; Maestre, Juan Alcaraz (Madrid, CIEMAT) ; Alimena, Juliette (DESY) ; Alison, John (Carnegie Mellon U.) ; Azzi, Patrizia (INFN, Padua) ; Azzurri, Paolo (INFN, Pisa) ; Bagnaschi, Emanuele (CERN ; INFN, Italy) et al.
In order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define a set of focus topics. [...]
arXiv:2401.07564. - 65.
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7.
Hide and seek: how PDFs can conceal New Physics / Hammou, Elie (Cambridge U., DAMTP) ; Kassabov, Zahari (Cambridge U., DAMTP) ; Madigan, Maeve (Heidelberg U.) ; Mangano, Michelangelo L. (CERN) ; Mantani, Luca (Cambridge U., DAMTP) ; Moore, James (Cambridge U., DAMTP) ; Alvarado, Manuel Morales (Cambridge U., DAMTP) ; Ubiali, Maria (Cambridge U., DAMTP)
The interpretation of LHC data, and the assessment of possible hints of new physics, require the precise knowledge of the proton structure in terms of parton distribution functions (PDFs). We present a systematic methodology designed to determine whether and how global PDF fits might inadvertently 'fit away' signs of new physics in the high-energy tails of the distributions. [...]
arXiv:2307.10370; CERN-TH-2023-137.- 2023-11-16 - 50 p. - Published in : JHEP 2311 (2023) 090 Fulltext: 2307.10370 - PDF; document - PDF;
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8.
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. - 18 p.
Response to - Fulltext
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EFTs and machine learning / Ubiali, Maria (speaker)
2022 - 1137. Conferences; 10th Edition of the Large Hadron Collider Physics Conference External links: Talk details; Event details In : 10th Edition of the Large Hadron Collider Physics Conference
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10.
The dark side of the proton / McCullough, Matthew (CERN) ; Moore, James (Cambridge U.) ; Ubiali, Maria (Cambridge U.)
We study the sensitivity of the High-Luminosity LHC to a light baryonic dark photon $B$, primarily coupled to quarks, as a constituent of the proton. This is achieved by allowing for a dark photon parton distribution function (PDF) in the PDF evolution equations. [...]
arXiv:2203.12628; CERN-TH-2022-043.- 2022-08-01 - 30 p. - Published in : JHEP 2208 (2022) 019 Fulltext: document - PDF; 2203.12628 - PDF;
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