ABM11 PDFs and the cross section benchmarks in the NNLO

Alekhin, S.; Bluemlein, Johannes; Moch, S.

doi:10.22323/1.151.0016

Cited by 8 publications

(10 citation statements)

References 38 publications

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“…A set of χ 2 values were also evaluated for the ABM11 PDF set [87], for R = 0.4 and R = 0.6, for the p jet,max T and p jet T scale choices, in the full p T range, for individual |y| bins, as well as all the |y| bins together. In this case, tension between data and the theory prediction is observed even in individual |y| bins, with P obs values below 10 −3 for both |y| < 0.5 and 0.5 ≤ |y| < 1.0.…”

Section: Quantitative Comparison Of Data To Nlo Qcd Calculationsmentioning

confidence: 99%

Measurement of the inclusive jet cross-sections in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Aaboud¹,

Aad²,

Abbott³

et al. 2017

J. High Energ. Phys.

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Inclusive jet production cross-sections are measured in proton-proton collisions at a centre-of-mass energy of √ s = 8 TeV recorded by the ATLAS experiment at the Large Hadron Collider at CERN. The total integrated luminosity of the analysed data set amounts to 20.2 fb −1 . Double-differential cross-sections are measured for jets defined by the anti-k t jet clustering algorithm with radius parameters of R = 0.4 and R = 0.6 and are presented as a function of the jet transverse momentum, in the range between 70 GeV and 2.5 TeV and in six bins of the absolute jet rapidity, between 0 and 3.0. The measured cross-sections are compared to predictions of quantum chromodynamics, calculated at next-to-leading order in perturbation theory, and corrected for non-perturbative and electroweak effects. The level of agreement with predictions, using a selection of different parton distribution functions for the proton, is quantified. Tensions between the data and the theory predictions are observed. 5 Event and jet selection 5 6 Jet energy calibration and resolution 6 6.1 Jet reconstruction 6 6.2 Jet energy calibration 6 6.3 Jet energy scale uncertainties 7 6.4 Jet energy resolution and uncertainties 8 6.5 Jet angular resolution and uncertainties 97 Unfolding of detector effects 98 Propagation of the statistical and systematic uncertainties 10 9 Theoretical predictions 11 9.1 Next-to-leading-order QCD calculation 11 9.2 Electroweak corrections 13 9.3 Non-perturbative corrections Conclusion 27A Quantitative comparison of data to NLO QCD calculations with alternate correlation scenarios 29The ATLAS collaboration 37-1 - JHEP09(2017)020 1 IntroductionThe Large Hadron Collider (LHC) [1] at CERN, colliding protons on protons, provides a unique opportunity to explore the production of hadronic jets in the TeV energy range. In Quantum Chromodynamics (QCD), jet production can be interpreted as the fragmentation of quarks and gluons produced in a short-distance scattering process. The inclusive jet production cross-section (p + p → jet + X) gives valuable information about the strong coupling constant (α s ) and the structure of the proton. It is also among the processes directly testing the experimentally accessible space-time distances. Next-to-leading-order (NLO) perturbative QCD calculations [2,3] give quantitative predictions of the jet production cross-sections. Progress in next-to-next-to-leading-order (NNLO) QCD calculations has been made over the past several years [4][5][6][7][8][9]. After the completion of the first calculations of some sub-processes [10,11], the complete NNLO QCD inclusive jet cross-section calculation was published recently [12].As fixed-order QCD calculations only make predictions for the quarks and gluons associated with the short-distance scattering process, corrections for the fragmentation of these partons to particles need to be applied. The measurements can also be compared to Monte Carlo event generator predictions that directly simulate the particles entering the detector. These event gen...

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Section: Quantitative Comparison Of Data To Nlo Qcd Calculationsmentioning

confidence: 99%

Measurement of the inclusive jet cross-sections in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Aaboud¹,

Aad²,

Abbott³

et al. 2017

J. High Energ. Phys.

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show abstract

“…Note that for bins where no events are observed, the limit is quoted at 68% probability, neglecting the systematic uncertainty. Also shown are the predictions from a number of other PDF sets (ABM11 [45], CT10 [46], MSTW2008 [47], NNPDF2.3 [48]), normalised to the predictions from HERAPDF1.5. Within the quoted uncertainties, the agreement between measurements and expectations is good.…”

Section: Resultsmentioning

confidence: 99%

Measurement of neutral current e±p cross sections at high Bjorken x with the ZEUS detector

Levy¹

2014

Proceedings of XXII. International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2014)

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The neutral current e ± p cross section has been measured up to values of Bjorken x ∼ = 1 with the ZEUS detector at HERA using an integrated luminosity of 187 pb −1 of e − p and 142 pb −1 of e + p collisions at √ s = 318 GeV. Differential cross sections in x and Q 2 , the exchanged boson virtuality, are presented for Q 2 ≥ 725 GeV 2 . An improved reconstruction method and greatly increased amount of data allows a finer binning in the high-x region of the neutral current cross section and leads to a measurement with much improved precision compared to a similar earlier analysis. The measurements are compared to Standard Model expectations based on a variety of recent parton distribution functions.

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“…The PDF sets vary for a variety of reasons: the value of the strong coupling constant, the fitting procedure, and the input data used. For example, CT10 [13], NNPDF2.3 [14], and HERA PDF 1.5 [15] use α S =0.118, 0.118, and 0.1176 respectively while MSTW 2008 [16] and ABM 11 [17] determine α S simultaneously as part of the fit and get values of 0.1202 and 0.1134. Comparisons to these different PDF sets are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Differential top-quark pair production measurements

Bernard

2014

EPJ Web of Conferences

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Abstract. The large number of top quarks produced at the CERN Large Hadron Collider makes it possible to measure the top-quark pair production cross-section differentially with respect to different observables. Differential measurements are important for precision tests and comparisons with Monte Carlo simulations and theoretical calculations. Top-quark pair production in particular is also an important process to study because it is a large background for many analyses. In this paper, several top-quark pair production differential measurements, performed with the ATLAS detector, are described including measurements of the kinematics of the top-quark pair system, of the jet multiplicity, and of the jet activity accompanying the top-quark pair system.

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ABM11 PDFs and the cross section benchmarks in the NNLO

Cited by 8 publications

References 38 publications

Measurement of the inclusive jet cross-sections in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Measurement of the inclusive jet cross-sections in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Measurement of neutral current e±p cross sections at high Bjorken x with the ZEUS detector

Differential top-quark pair production measurements

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