NNLO QCD predictions for W+c-jet production at the LHC

Czakon, Michał; Mitov, Alexander; Pellen, Mathieu; Poncelet, Rene

doi:10.1007/jhep06(2021)100

Cited by 39 publications

(67 citation statements)

References 89 publications

(122 reference statements)

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“…We include CMS data on the production of W + charm jets. In principle one might think that this is not appropriate as there is no NNLO calculation of this process included at present, with the full NNLO corrections to the dominant CKM-diagonal contribution only recently calculated [123]. However, we choose to include it essentially as a cross check on the impact of other data, given the degree of tension observed between the dimuon and ATLAS W , Z data.…”

Section: Atlas W + Jetsmentioning

confidence: 99%

Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs

Bailey,

Cridge,

Harland-Lang

et al. 2020

Preprint

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We present the new MSHT20 set of parton distribution functions (PDFs) of the proton, determined from global analyses of the available hard scattering data. The PDFs are made available at NNLO, NLO, and LO, and supersede the MMHT14 sets. They are obtained using the same basic framework, but the parameterisation is now adapted and extended, and there are 32 pairs of eigenvector PDFs. We also include a large number of new data sets: from the final HERA combined data on total and heavy flavour structure functions, to final Tevatron data, and in particular a significant number of new LHC 7 and 8 TeV data sets on vector boson production, inclusive jets and top quark distributions. We include up to NNLO QCD corrections for all data sets that play a major role in the fit, and NLO EW corrections where relevant. We find that these updates have an important impact on the PDFs, and for the first time the NNLO fit is strongly favoured over the NLO, reflecting the wider range and in particular increased precision of data included in the fit. There are some changes to central values and a significant reduction in the uncertainties of the PDFs in many, though not all, cases. Nonetheless, the PDFs and the resulting predictions are generally within one standard deviation of the MMHT14 results. The major changes are the u − d valence quark difference at small x, due to the improved parameterisation and new precise data, the d, ū difference at small x, due to a much improved parameterisation, and the strange quark PDF due to the effect of LHC W, Z data and inclusion of new NNLO corrections for dimuon production in neutrino DIS. We discuss the phenomenological impact of our results, and in general find reduced uncertainties in predictions for processes such as Higgs, top quark pair and W, Z production at post LHC Run-II energies.We dedicate this paper to the memory of James Stirling and Dick Roberts, both of whom sadly died in the past two years. They were founding members of the collaboration of our PDF global analyses, which started with the presentation of the first ever NLO PDF sets in 1987.

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Section: Atlas W + Jetsmentioning

confidence: 99%

Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs

Bailey,

Cridge,

Harland-Lang

et al. 2020

Preprint

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“…• W and Z boson + heavy quark data, particularly W + c, which can constrain the strange quark, providing that theoretical calculations can be extended to N2LO. There is some progress in that direction [90] but at present experimental and theoretical jet algorithms are not fully consistent.…”

Section: Methodsmentioning

confidence: 99%

Snowmass 2021 whitepaper: Proton structure at the precision frontier

Amoroso,

Apyan,

Armesto

et al. 2022

Preprint

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An overwhelming number of theoretical predictions for hadron colliders require parton distribution functions (PDFs), which are an important ingredient of theory infrastructure for the next generation of high-energy experiments. This whitepaper summarizes the status and future prospects for determination of high-precision PDFs applicable in a wide range of energies and experiments, in particular in precision tests of the Standard Model and in new physics searches at the high-luminosity Large Hadron Collider and Electron-Ion Collider. We discuss the envisioned advancements in experimental measurements, QCD theory, global analysis methodology, and computing that are necessary to bring unpolarized PDFs in the nucleon to the N2LO and N3LO accuracy in the QCD coupling strength. Special attention is given to the new tasks that emerge in the era of the precision PDF analysis, such as those focusing on the robust control of systematic factors both in experimental measurements and theoretical computations. Various synergies between experimental and theoretical studies of the hadron structure are explored, including opportunities for studying PDFs for nuclear and meson targets, PDFs with electroweak contributions or dependence on the transverse momentum, for incisive comparisons between phenomenological models for the PDFs and computations on discrete lattice, and for cross-fertilization with machine learning/AI approaches.

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“…The calculation is performed in the STRIPPER approach [24][25][26]. The approach has already been applied in the calculation of NNLO QCD corrections to top-pair [27][28][29][30][31], inclusive jet [32], three-photon [15], W +c jet [33], identified B-hadron [34] and polarized W -pair [35] production at the LHC. A detailed description of the technical aspects of our implementation has been given in ref.…”

Section: Setup Of the Calculationmentioning

confidence: 99%

NNLO QCD corrections to diphoton production with an additional jet at the LHC

Chawdhry

Czakon

Mitov

et al. 2021

J. High Energ. Phys.

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We calculate the NNLO QCD corrections to diphoton production with an additional jet at the LHC. Our calculation represents the first NNLO-accurate prediction for the transverse momentum distribution of the diphoton system. The improvement in the accuracy of the theoretical prediction is significant, by a factor of up to four relative to NLO QCD as estimated through scale variations. Our calculation is exact except for the finite remainder of the two-loop amplitude which is included at leading color. The numerical impact of this approximated contribution is small. The results of this work are expected to further our understanding of the Higgs boson sector and of the behavior of higher-order corrections to LHC processes.

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NNLO QCD predictions for W+c-jet production at the LHC

Cited by 39 publications

References 89 publications

Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs

Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs

Snowmass 2021 whitepaper: Proton structure at the precision frontier

NNLO QCD corrections to diphoton production with an additional jet at the LHC

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