New parton distribution functions from a global analysis of quantum chromodynamics

By S. Dulat, T. Hou, Jun Gao, Marco Guzzi, J. Huston, Pavel M. Nadolsky, J. Pumplin, C. Schmidt, D. Stump, C. Yuan. 2015

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Here, we present new parton distribution functions (PDFs) up to next-to-next-to-leading order (NNLO) from the CTEQ-TEA global analysis of quantum chromodynamics. These differ from previous CT PDFs in several respects, including the use of data from LHC experiments and the new D0 charged lepton rapidity asymmetry data, as well as the use of more flexible parametrization of PDFs that, in particular, allows a better fit to different combinations of quark flavors. Predictions for important LHC processes, especially Higgs boson production at 13 TeV, are presented. These CT14 PDFs include a central set and error sets in the Hessian representation. For completeness, we also present the CT14 PDFs determined at the leading order (LO) and the next-to-leading order (NLO) in QCD. Besides these general-purpose PDF sets, we provide a series of (N)NLO sets with various αs values and additional sets in general-mass variable flavor number (GM-VFN) schemes, to deal with heavy partons, with up to 3, 4, and 6 active flavors.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/4bc9acf3b1349239ef037be6c52d908524cd2abb

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Citations in the corpus

The photon content of the proton (2017, methodology): “For example CT14nnlo and MMHT2014nnlo68cl have their b-quark threshold at 4.75 GeV, while NNPDF30 nnlo as 0118 has its threshold at 4.18 GeV, as can be seen in Fig.”
Search for electroweak production of supersymmetric states in scenarios with compressed mass spectra at √s = 13 TeV with the ATLAS detector (2017, neutral): “The effects of PDF uncertainties are evaluated by reweighting the simulated samples to the CT14 [118] and MMHT2014 [119] PDF sets and taking the envelope of the predicted yields.”
Search for doubly charged Higgs boson production in multi-lepton final states with the ATLAS detector using proton–proton collisions at \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepac (2017, neutral): “Higher-order corrections were applied to the Drell–Yan simulated events to scale the mass-dependent cross-section computed at next-to-leading order (NLO) in the strong coupling constant with the CT10 PDF set to next-to-next-toleading order (NNLO) in the strong coupling constant with the CT14NNLO PDF”
Measurement of forward W → eν production in pp collisions at s=8$$ \sqrt{s}=8 $$ TeV (2016, methodology): “Measurements are compared to theoretical predictions calculated with the Fewz [15, 16] generator at NNLO for the six PDF sets: ABM12 [35], CT14 [36], HERA1.”
Higgs Physics at the HL-LHC and HE-LHC (2019, methodology): “Keeping the current theoretical (80)For details of the NLO calculation , see the supplemental material with Refs [506, 507, 508, 509, 510, 481, 511, 512, 96, 513, 514, 515, 516].”
Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, methodology): “These differences in NLO numerical DGLAP evolution, while formally allowed, also affect the most recent generation of NLO PDFs, i.e., CT14+MMHT2014 vs. NNPDF3.”
Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb−1 of pp collisions at s=13$$ \sqrt{s}=13 $$ TeV with the ATLAS detector (2018, methodology): “The CT10 [53] set of parton distribution functions (PDFs) was used in the generation of gluon-gluon fusion events while CT10nlo nf4 [54] was used to produce the b-associated signal samples.”
Measurement of differential cross sections for top quark pair production using the lepton+jets final state in proton-proton collisions at 13 TeV (2016, methodology): “The W boson and DY backgrounds are normalized to their NNLO cross sections [23].”
Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector (2017, methodology): “The CT10 [53] set of parton distribution functions (PDFs) was used in the generation of gluon–gluon fusion events while CT10nlo_nf4 [54] was used to produce the b-associated signal samples.”