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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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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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18 p.
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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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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Parton distributions from high-precision collider data
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Bertone, Valerio (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Carrazza, Stefano (CERN) ; Del Debbio, Luigi (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Forte, Stefano (INFN, Milan ; Milan U.) ; Groth-Merrild, Patrick (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Guffanti, Alberto (Turin U. ; INFN, Turin) ; Hartland, Nathan P. (NIKHEF, Amsterdam ; Vrije U., Amsterdam) ; Kassabov, Zahari (INFN, Turin ; Milan U. ; Turin U. ; INFN, Milan) ; Latorre, José I. (Barcelona U., ECM ; Singapore Natl. U.) et al.
/NNPDF
We present a new set of parton distributions, NNPDF3.1, which updates NNPDF3.0, the first global set of PDFs determined using a methodology validated by a closure test. The update is motivated by recent progress in methodology and available data, and involves both. [...]
arXiv:1706.00428; EDINBURGH-2017-08; NIKHEF-2017-006; OUTP-17-04P; TIF-UNIMI-2017-3; CAVENDISH-HEP-17-06; CERN-TH-2017-077; Edinburgh 2017/08,
Nikhef/2017-006; OUTP-17-04P,TIF-UNIMI-2017-3.-
2017-10-04 - 95 p.
- Published in : Eur. Phys. J. C 77 (2017) 663
Article from SCOAP3: PDF; Fulltext: 1706.00428 - PDF; arXiv:1706.00428 - PDF;
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A Determination of the Charm Content of the Proton
/ Ball, Richard D. (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Bertone, Valerio (Oxford U., Theor. Phys.) ; Bonvini, Marco (Oxford U., Theor. Phys.) ; Carrazza, Stefano (CERN) ; Forte, Stefano (Milan U. ; INFN, Milan) ; Guffanti, Alberto (Turin U. ; INFN, Turin) ; Hartland, Nathan P. (Oxford U., Theor. Phys.) ; Rojo, Juan (Oxford U., Theor. Phys.) ; Rottoli, Luca (Oxford U., Theor. Phys.)
/NNPDF Collaboration
We present an unbiased determination of the charm content of the proton, in which the charm parton distribution function (PDF) is parametrized on the same footing as the light quarks and the gluon in a global PDF analysis. This determination relies on the calculation of deep-inelastic structure functions in the FONLL scheme, generalized to account for massive charm-initiated contributions. [...]
arXiv:1605.06515; EDINBURGH-2016-06; CERN-TH-2016-087; OUTP-16-03P; TIF-UNIMI-2016-3; EDINBURGH 2016-06; CERN-TH-2016-087; OUTP-16-03P; TIF-UNIMI-2016-3.-
2016-11-24 - 35 p.
- Published in : Eur. Phys. J. C 76 (2016) 647
Article from SCOAP3: PDF; Fulltext: PDF;
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