ABM11 PDFs and the cross section benchmarks in NNLO

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

doi:10.48550/arxiv.1302.1516

Cited by 5 publications

(6 citation statements)

References 14 publications

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“…We are demonstrating overall very good consistency of the ABM11 PDFs with the available LHC data. Particular aspects of these findings have been reported previously [7][8][9][10][11].…”

Section: Introductionsupporting

confidence: 74%

“…In particular, we find m t (m t )/GeV α s (M Z ) = 0.1139 (10) and a marginal change in the gluon PDF for a variant of ABM12 fit with m t (m t ) = 162 GeV fixed and with the CMS [19,21,22] and the Tevatron [23] data included, i.e., leaving out the ATLAS data due to the larger experimental uncertainties. This is to be compared with α s (M Z ) = 0.1133 (8) for the ABM11 PDF fit and, again, demonstrates nicely the stability of the analysis, provided all correlations are accounted for. We briefly comment here on related studies, that have appeared in the literature.…”

Section: The Data For T T Production In the Abm12 Fitmentioning

confidence: 57%

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The ABM parton distributions tuned to LHC data

2014

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We present a global fit of parton distributions at next-to-next-to-leading order (NNLO) in QCD. The fit is based on the world data for deep-inelastic scattering, fixed-target data for the Drell-Yan process and includes, for the first time, data from the Large Hadron Collider (LHC) for the Drell-Yan process and the hadro-production of top-quark pairs. The analysis applies the fixed-flavor number scheme for n_f=3,4,5, uses the MS-bar scheme for the strong coupling \alpha_s and the heavy-quark masses and keeps full account of the correlations among all non-perturbative parameters. At NNLO this returns the values of \alpha_s(M_Z) = 0.1132 +- 0.0011 and m_t(pole) = 171.2 +- 2.4 GeV for the top-quark pole mass.The fit results are used to compute benchmark cross sections for Higgs production at the LHC to NNLO accuracy. We compare our results to those obtained by other groups and show that differences can be linked to different theoretical descriptions of the underlying physical processes.Comment: 31 pages, 15 figure

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“…We are demonstrating overall very good consistency of the ABM11 PDFs with the available LHC data. Particular aspects of these findings have been reported previously [7][8][9][10][11].…”

Section: Introductionsupporting

confidence: 74%

Section: The Data For T T Production In the Abm12 Fitmentioning

confidence: 57%

The ABM parton distributions tuned to LHC data

2014

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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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“…[1,42]. The uncertainty due to the choice of PDF is investigated by comparing the central values of various PDFs, namely MSTW2008NNLO, CT10NNLO [43], NNPDF2.3 [44], ABM11 [45], and HERAPDF1.5 [46]. All except for ABM11 are found to be within the MSTW2008NNLO 90% C.L.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

Search for contact interactions and large extra dimensions in the dilepton channel using proton–proton collisions at $$\sqrt{s}~=$$ s = 8 TeV with the ATLAS detector

et al. 2014

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A search is conducted for non-resonant new phenomena in dielectron and dimuon final states, originating from either contact interactions or large extra spatial dimensions. The LHC 2012 proton–proton collision dataset recorded by the ATLAS detector is used, corresponding to 20 fb at = 8 TeV. The dilepton invariant mass spectrum is a discriminating variable in both searches, with the contact interaction search additionally utilizing the dilepton forward-backward asymmetry. No significant deviations from the Standard Model expectation are observed. Lower limits are set on the contact interaction scale between 15.4 TeV and 26.3 TeV, at the 95 % credibility level. For large extra spatial dimensions, lower limits are set on the string scale between 3.2 TeV to 5.0 TeV.

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ABM11 PDFs and the cross section benchmarks in NNLO

Cited by 5 publications

References 14 publications

The ABM parton distributions tuned to LHC data

The ABM parton distributions tuned to LHC data

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

Search for contact interactions and large extra dimensions in the dilepton channel using proton–proton collisions at $$\sqrt{s}~=$$ s = 8 TeV with the ATLAS detector

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