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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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18 p.
Response to - Fulltext
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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 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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Parton distributions with QED corrections
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Bertone, Valerio (Freiburg U.) ; Carrazza, Stefano (Milan U. ; INFN, Milan) ; Del Debbio, Luigi (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Forte, Stefano (Milan U. ; INFN, Milan) ; Guffanti, Alberto (Bohr Inst.) ; Hartland, Nathan P. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Rojo, Juan (CERN)
/NNPDF Collaboration
We present a set of parton distribution functions (PDFs), based on the NNPDF2.3 set, which includes a photon PDF, and QED contributions to parton evolution. We describe the implementation of the combined QCD+QED evolution in the NNPDF framework. [...]
arXiv:1308.0598; EDINBURGH-2013-20; FR-PHENO-2013-008; CERN-PH-TH-2013-075; Edinburgh 2013/20; IFUM-1014-FT; FR-PHENO-2013-008,
CERN-PH-TH/2013-075; EDINBURGH 2013-20; IFUM-1014-FT; FR-PHENO-2013-008; CERN-PH-TH-2013-075.-
2013-12-11 - 31 p.
- Published in : Nucl. Phys. B 877 (2013) 290-320
Fulltext: 1308.0598 - PDF; arXiv:1308.0598 - PDF; External link: Preprint
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Precision determination of the strong coupling constant within a global PDF analysis
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Carrazza, Stefano (CERN) ; Del Debbio, Luigi (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Forte, Stefano (INFN, Milan ; Milan U.) ; Kassabov, Zahari (Cambridge U.) ; Rojo, Juan (Vrije U., Amsterdam ; NIKHEF, Amsterdam) ; Slade, Emma (Oxford U., Theor. Phys.) ; Ubiali, Maria (Cambridge U., DAMTP)
/NNPDF Collaboration
We present a determination of the strong coupling constant $\alpha_s(m_Z)$ based on the NNPDF3.1 determination of parton distributions, which for the first time includes constraints from jet production, top-quark pair differential distributions, and the $Z$ $p_T$ distributions using exact NNLO theory. Our result is based on a novel extension of the NNPDF methodology - the correlated replica method - which allows for a simultaneous determination of $\alpha_s$ and the PDFs with all correlations between them fully taken into account. [...]
arXiv:1802.03398; CAVENDISH-HEP-18-02; CERN-TH-2018-024; Edinburgh 2017/19; Nikhef/2017-046; OUTP-17-14P; DAMTP-2018-3; TIF-UNIMI-2018-1; EDINBURGH-2017-19; NIKHEF-2017-046.-
2018-05-24 - 23 p.
- Published in : Eur. Phys. J. C 78 (2018) 408
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: 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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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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Intrinsic charm in a matched general-mass scheme
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Bertone, Valerio (Oxford U., Theor. Phys. ; CERN) ; Bonvini, Marco (Oxford U., Theor. Phys.) ; Forte, Stefano (Milan U. ; INFN, Milan) ; Groth Merrild, Patrick (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Rojo, Juan (Oxford U., Theor. Phys.) ; Rottoli, Luca (Oxford U., Theor. Phys.)
The FONLL general-mass variable-flavour number scheme provides a framework for the matching of a calculation in which a heavy quark is treated as a massless parton to one in which the mass dependence is retained throughout. We describe how the usual formulation of FONLL can be extended in such a way that the heavy quark parton distribution functions are freely parameterized at some initial scale, rather than being generated entirely perturbatively. [...]
arXiv:1510.00009; EDINBURGH-2015-06; TIF-UNIMI-2015-11; EDINBURGH-2015-14; CERN-PH-TH-2015-176; OUTP-15-20P; EDINBURGH 2015-06; CERN-PH-TH-2015-176; TIF-UNIMI-2015-11; OUTP-15-20P.-
Geneva : CERN, 2016-03-10 - 10 p.
- Published in : Phys. Lett. B 754 (2016) 49-58
Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
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