The strangest proton?

We study the production of a W boson in association with a c-jet at the LHC. We calculate, for the first time, the complete set of NNLO QCD corrections to the dominant CKM-diagonal contribution to this process. Both signatures, pp → μ+νμjc and pp →$$ {\mu}^{-}{\overline{\nu}}_{\mu }{\mathrm{j}}_c $$ μ − ν ¯ μ j c are considered. We present predictions for fiducial cross sections and differential distributions for each one of the two signatures as well as for their ratio. The theoretical predictions are compared with ATLAS measurements at 7 TeV. The results of this work are essential for the precision description of associated heavy flavor production at hadron colliders and for the determination of the strange-quark content of the proton from LHC data in NNLO QCD.

Section: Introductionmentioning

confidence: 99%

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

Czakon

Mitov

Pellen

et al. 2021

“…Table 1 summarises the low-mass and on-shell datasets, where in each case we indicate the experiment, the centre-of-mass energy √ s, the publication reference, the physical observable, and the number of data points. The only difference as compared to [95] is the removal of the W → eν asymmetry measurements from D0 [97], which were found to be inconsistent with the rest of the Drell-Yan data.…”

Section: Experimental Datamentioning

confidence: 89%

“…The present analysis is based on the DIS and DY measurements which were part of the strangeness study of [95], which in turn was a variant of the NNPDF3.1 global PDF determination [74], extended with additional high-mass DY cross sections. The DIS structure functions include the same legacy HERA inclusive combination [96] used in the DIS-only joint fit of PDF and EFT effects of [72].…”

Section: Experimental Datamentioning

confidence: 99%

“…No other datasets beyond DIS and DY are considered. In particular, the inclusive jet and top quark production measurements used in [95] are excluded from the present analysis. The rationale behind this choice is the following.…”

Section: Experimental Datamentioning

confidence: 99%

“…In table 2 we also indicate the final state, whether the distribution is 1D or 2D (thus differential only in the lepton invariant mass or differential in the lepton invariant mass and rapidity), the integrated luminosity L, and the values of the dilepton invariant mass m for the most energetic bin. We note that while the ATLAS and CMS measurements at √ s = 7 TeV [120, 121] were already part of the strangeness study of [95], the corresponding 8 TeV and 13 TeV measurements from [86,87,122] were not and are being considered for the first time in this analysis. For data are available in terms of both Born and dressed leptons, the ATLAS 7 TeV analysis being an example thereof, we use the Born data so that it is not necessary to supplement our fixed-order predictions with final-state QED radiation corrections.…”

Section: Experimental Datamentioning

confidence: 99%

See 2 more Smart Citations

Parton distributions in the SMEFT from high-energy Drell-Yan tails

Greljo

Iranipour

Kassabov

et al. 2021

Self Cite

The high-energy tails of charged- and neutral-current Drell-Yan processes provide important constraints on the light quark and anti-quark parton distribution functions (PDFs) in the large-x region. At the same time, short-distance new physics effects such as those encoded by the Standard Model Effective Field Theory (SMEFT) would induce smooth distortions to the same high-energy Drell-Yan tails. In this work, we assess for the first time the interplay between PDFs and EFT effects for high-mass Drell-Yan processes at the LHC and quantify the impact that the consistent joint determination of PDFs and Wilson coefficients has on the bounds derived for the latter. We consider two well-motivated new physics scenarios: 1) electroweak oblique corrections ($$ \hat{W},\hat{Y} $$ W ̂ , Y ̂ ) and 2) four-fermion interactions potentially related to the LHCb anomalies in R(K(*)). We account for available Drell-Yan data, both from unfolded cross sections and from searches, and carry out dedicated projections for the High-Luminosity LHC. Our main finding is that, while the interplay between PDFs and EFT effects remains moderate for the current dataset, it will become a significant challenge for EFT analyses at the HL-LHC.

A detailed investigation of W+c-jet at the LHC

Czakon

Mitov

Pellen

et al. 2023

State-of-the-art analyses of W+c-jet production at the LHC require precise predictions. In the present work, we study in detail the impact of off-diagonal CKM elements up to next-to-next-to leading order in QCD, the influence of flavored jet algorithms, and the size of electroweak corrections. In addition, we also investigate phenomenological aspects related to the exact definition of the process. We find that all these effects can be of the order of several per cent for both the fiducial cross section and differential distributions. They are, therefore, very relevant for the interpretation of current and upcoming measurements.