QCD analysis of W- and Z-boson production at Tevatron

team, HERAFitter; Camarda, S.; Belov, Pavel A.; Cooper-Sarkar, A. M.; Diaconu, C.; Glazov, A.; Guffanti, A.; Jung, Andreas Werner; Колесников, В. И.; Lohwasser, K.; Myronenko, V.; Olness, Fred; Pirumov, H.; Plačakytė, R.; Radescu, V.; Sapronov, A.; Słomiński, W.; Starovoitov, P.; Sutton, M. R.

doi:10.1140/epjc/s10052-015-3655-7

Cited by 30 publications

(11 citation statements)

References 39 publications

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“…We have extended the method of Paukkunen and Zurita to update the Hessian PDFs, of which CTEQ-TEA PDFs are typical examples. Some specific advances, as compared to the previous work [13,15], are given as follows. As briefly reviewed in Secs.…”

Section: Discussionmentioning

confidence: 99%

“…[14]. A version of this method has also been included in the xFitter package [15], where it is called Hessian profiling. The advantage of this Hessian updating method over the Monte Carlo reweighting method is that it directly works with the (small set of) Hessian PDFs and it is a simpler and much faster way to estimate the effects of the new data.…”

Section: Introductionmentioning

confidence: 99%

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Updating and optimizing error parton distribution function sets in the Hessian approach

2018

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We discuss how to apply the Hessian method (i) to predict the impact of a new data set (or sets) on the parton distribution functions (PDFs) and their errors, by producing an updated best-fit PDF and error PDF sets, such as the CTEQ-TEA PDFs; (ii) to predict directly the effect of a new data set on the PDF errors of any other set of observables, without the need to recalculate using the new error PDFs; and (iii) to transform the original set into a reduced set of error PDFs which is optimized for a specific set of observables to reproduce the PDF-induced uncertainties to any specified precision. We present a software package, ePump (error PDF Updating Method Package), that can be used to update or optimize a set of PDFs, including the best-fit PDF set and Hessian eigenvector pairs of PDF sets (i.e., error PDFs), and to update any other set of observables. We demonstrate the potential of the program by presenting selected phenomenological applications relevant to the Large Hadron Collider. Special care is given to discuss the assumptions made and the limitations of this theoretical framework compared to a treatment by the full global-analysis program.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Updating and optimizing error parton distribution function sets in the Hessian approach

2018

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“…The impact of the ATLAS data on the PDF uncertainties can be quantified by using the PDF profiling method [78,79]. It is preferable to quantify the impact of the ATLAS data by using PDFs that do not include the cross-section data used in this analysis.…”

Section: Quantitative Comparison With Predictionsmentioning

confidence: 99%

Measurements of top-quark pair to Z-boson cross-section ratios at s = 13 $$ \sqrt{s}=13 $$ , 8, 7 TeV with the ATLAS detector

Aaboud

Aad

Abbott

et al. 2017

J. High Energ. Phys.

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Measurements of top-quark pair to Z-boson cross-section ratios at √ s = 13, 8, 7 TeV with the ATLAS detectorThe ATLAS Collaboration Ratios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of √ s = 13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given √ s for the two processes and at different √ s for each process, as well as double ratios of the two processes at different √ s, are evaluated. The ratios are constructed using previously published ATLAS measurements of the tt and Z-boson production cross sections, corrected to a common phase space where required, and a new analysis of Z → + − where = e, µ at √ s = 13 TeV performed with data collected in 2015 with an integrated luminosity of 3.2 fb −1 . Correlations of systematic uncertainties are taken into account when evaluating the uncertainties in the ratios. The correlation model is also used to evaluate the combined cross section of the Z → e + e − and the Z → µ + µ − channels for each √ s value. The results are compared to calculations performed at next-tonext-to-leading-order accuracy using recent sets of parton distribution functions. The data demonstrate significant power to constrain the gluon distribution function for the Bjorken-x values near 0.1 and the light-quark sea for x < 0.02. c 2017 CERN for the benefit of the ATLAS Collaboration. ContentsA Predictions involving Z-boson total cross sections 30 B Acceptance factors and results in the Z-boson total phase space 31 C Tables of results 31 Events containing a Z-boson candidate are chosen by requiring exactly two selected leptons of the same flavour but of opposite charge with an invariant mass of 66 < m < 116 GeV. A total of 1,367,026 candidates and 1,735,197 candidates pass all requirements in the electron and muon channels, respectively. 9

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“…These PDF sets, shown by the green bands, both have a larger high-x gluon than preferred by the HERA I+II data, with or without the addition of the tt data from this analysis. The impact of the tt data on the global PDF sets was investigated using a profiling procedure [113,118,119], extending the χ 2 definition of Eq. (7) to incorporate a vector b th of nuisance parameters b k,th expressing the dependence of the theoretical prediction ς th i on the uncertainties for a particular PDF set.…”

Section: Constraints On the Gluon Parton Distribution Functionmentioning

confidence: 99%

Measurement of lepton differential distributions and the top quark mass in $$t\bar{t}$$ t t ¯

Aaboud¹,

Aad²,

Abbott³

et al. 2017

Eur. Phys. J. C

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This paper presents single lepton and dilepton kinematic distributions measured in dileptonic tt events produced in 20.2 fb −1 of √ s = 8 TeV pp collisions recorded by the ATLAS experiment at the LHC. Both absolute and normalised differential cross-sections are measured, using events with an opposite-charge eμ pair and one or two btagged jets. The cross-sections are measured in a fiducial region corresponding to the detector acceptance for leptons, and are compared to the predictions from a variety of Monte Carlo event generators, as well as fixed-order QCD calculations, exploring the sensitivity of the cross-sections to the gluon parton distribution function. Some of the distributions are also sensitive to the top quark pole mass; a combined fit of NLO fixed-order predictions to all the measured distributions yields a top quark mass value of m pole t = 173.2 ± 0.9 ± 0.8 ± 1.2 GeV, where the three uncertainties arise from data statistics, experimental systematics, and theoretical

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QCD analysis of W- and Z-boson production at Tevatron

Cited by 30 publications

References 39 publications

Updating and optimizing error parton distribution function sets in the Hessian approach

Updating and optimizing error parton distribution function sets in the Hessian approach

Measurements of top-quark pair to Z-boson cross-section ratios at s = 13 $$ \sqrt{s}=13 $$ , 8, 7 TeV with the ATLAS detector

Measurement of lepton differential distributions and the top quark mass in $$t\bar{t}$$ t t ¯

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