Constraints on the gluon PDF from top quark pair production at hadron colliders
By Michal Czakon, M. Mangano, Alexander Mitov, Juan Rojo. 2013
138 citations recorded by the source corpus.
A bstractUsing the recently derived NNLO cross sections [1], we provide NNLO+NNLL theoretical predictions for top quark pair production based on all the available NNLO PDF sets, and compare them with the most precise LHC and Tevatron data. In this comparison we study in detail the PDF uncertainty and the scale, mt and αs dependence of the theoretical predictions for each PDF set. Next, we observe that top quark pair production provides a powerful direct constraint on the gluon PDF at large x, and include Tevatron and LHC top pair data consistently into a global NNLO PDF fit. We then explore the phenomenological consequences of the reduced gluon PDF uncertainties, by showing how they can improve predictions for Beyond the Standard Model processes at the LHC. Finally, we update to full NNLO+NNLL the theoretical predictions for the ratio of top quark cross sections between different LHC center of mass energies, as well as the cross sections for hypothetical heavy fourth-generation quark production at the LHC.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/3b3feceebb4718dbde62e7a97a402d9c9fe36f90
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In Nuclear and High Energy Physics
- Atlas Collaboration
- Cms Collaboration
- Juan Rojo
- Gudrun Heinrich
- M. Schönherr
- Stefan Dittmaier
- Fabio Maltoni
- P. Nason
Citations in the corpus
- A critical appraisal and evaluation of modern PDFs (2016, methodology): “[259] has explored constraints on the gluon PDF from t t̄ hadroproduction data using fixed values for αs(MZ ) and the pole mass m t .”
- A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector (2019, background): “The inclusive tt̄ process is dominated by the gluon-gluon initial state, with a small admixture of the quark-antiquark partonic luminosity [93].”
- Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report (2014, background): “These include isolated photon production [259], the total cross-sections and differential distributions in top quark pair production [262], the transverse momentum distribution of electroweak vector bosons [261], inclusive jet and dijet producton data [90] as well as ratios of the above cross-sectio”
- Parton distributions for the LHC run II (2014, background): “already gave a very good description of all available ATLAS and CMS 7 TeV and 8 TeV production data [76], even though they were not included in the fit.”
- The Structure of the Proton in the LHC Precision Era (2017, background): “3 fit with those of the same fit including the constraints from top quark production cross sections [383].”
- The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II (2015, background): “Remarkably, some of these processes open completely new avenues for PDF fits: data on W+c production provides a clean handle on the strange PDF [27–29, 38] complementary to that of the low energy neutrino data [39], top quark-pair production allows for improved constraints on the large-x gluon compl”