Parton distribution functions and benchmark cross sections at next-to-next-to-leading order

Alekhin, S.; Blümlein, J.; Moch, S.

doi:10.1103/physrevd.86.054009

Cited by 329 publications

(449 citation statements)

References 192 publications

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“…At low m ee the ABM11 [45] prediction lies above this theoretical uncertainty band, in part due to the ABM11 PDF set using a value of α s outside of the 68% CL variation. The renormalisation and factorisation scale uncertainties contribute at most 1% to the theoretical uncertainty band in the highest m ee bin, having been evaluated by varying both scales up or down together by a factor of two, using VRAP [46].…”

Section: Results and Comparison To Theorymentioning

confidence: 99%

Measurement of the high-mass Drell–Yan differential cross-section in pp collisions at s=7 TeV with the ATLAS detector

Aad¹,

Abajyan²,

Abbott³

et al. 2013

Physics Letters B

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This Letter reports a measurement of the high-mass Drell-Yan differential cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. Based on an integrated luminosity of 4.9 fb −1 , the differential cross-section in the Z /γ * → e + e − channel is measured with the ATLAS detector as a function of the invariant mass, m ee , in the range 116 < m ee < 1500 GeV, for a fiducial region in which both the electron and the positron have transverse momentum p T > 25 GeV and pseudorapidity |η| < 2.5.A comparison is made to various event generators and to the predictions of perturbative QCD calculations at next-to-next-to-leading order.© 2013 CERN. Published by Elsevier B.V. All rights reserved. IntroductionAt hadron colliders, the Drell-Yan (DY) process [1], proceeding at tree level via the s-channel exchange of a virtual photon or Z boson, can produce charged lepton pairs over a wide range of invariant mass. The differential cross-section as a function of the invariant mass is described by perturbative QCD (pQCD) calculations at next-to-next-to-leading order (NNLO). Given the simple experimental signature and the low backgrounds, a small experimental uncertainty can be achieved on the measured invariant mass distribution allowing for a precision test of pQCD. The mass spectrum is also sensitive to the parton distribution functions (PDFs), in particular to the poorly known distribution of antiquarks at large x [2], where x can be interpreted, at leading order, as the fraction of the proton momentum carried by the interacting parton. Additionally, the production of DY dilepton pairs is a source of background for other Standard Model (SM) measurements, and the mass spectrum may be modified by new physics phenomena giving rise to, e.g., narrow resonances or an excess of high-mass pairs inconsistent with the known PDFs.The differential cross-section for DY dilepton pair production in the high-mass range has been reported previously by the CMS [3], CDF [4] and D0 [5] Collaborations. With the ATLAS detector, total and differential cross-sections in a mass window of 66-116 GeV have been measured using the 2010 dataset [6]. In addition, searches for new physics in the high-mass range have been performed [7][8][9] and no deviations from the SM expectation were observed. This Letter reports an extension of these previous ✩ © CERN for the benefit of the ATLAS Collaboration.E-mail address: atlas.publications@cern.ch.analyses by providing a measurement of the DY cross-section, fully corrected for detector effects, in the dielectron channel as a function of the e + e − invariant mass, m ee , up to 1500 GeV. To minimise model-dependent theoretical uncertainties, the cross-section is not extrapolated to the full phase space but is reported in a phase space only slightly extended with respect to the fiducial acceptance of the e + and e − . The results are compared to NNLO pQCD calculations with next-to-leading-order (NLO) electroweak corrections from the FEWZ 3.1 [10,11] framework and to the predictions from ...

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Section: Results and Comparison To Theorymentioning

confidence: 99%

Measurement of the high-mass Drell–Yan differential cross-section in pp collisions at s=7 TeV with the ATLAS detector

Aad¹,

Abajyan²,

Abbott³

et al. 2013

Physics Letters B

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“…refs. [6,8]. However, with account of the errors in the nuisance parameters due to fluctuations in the data and due to the PDF uncertainties the statistical significance of the spread in the nuisance parameters reduces.…”

Section: Analysis Of D0 Resultsmentioning

confidence: 99%

“…In the following section we analyze this trend for the different Tevatron jet data with respect to the ABKM09 [5] and ABM11 [8] fits considering two cases: before and after these data are included into the fit.…”

Section: Jhep02(2014)041mentioning

confidence: 99%

“…In the first, we study how the nominal ABKM09 [5] and ABM11 [8] fits, i.e., those corresponding to the publicly available tables in the LHAPDF library [11,12], accommodate the Tevatron jet data. In the second variant, analogous to preceding studies in [6,8], we analyze the changes after these data are included into the fit. …”

Section: Comparison Of the Abkm09 And Abm11 Fits With Tevatron Jet Datamentioning

confidence: 99%

“…The ABKM09 PDFs [5] and their refined version, ABM11 PDFs [8], were extracted to next-to-next-to-leading-order (NNLO) in perturbative QCD from a combination of the world inclusive DIS data supplemented by the fixed-target data for the Drell-Yan process and dimuon production in the neutrino-nucleon collision. The Tevatron jet data were also included into a variant of the ABKM09 fit [5,6] and good agreement with other data used in the fit has been achieved.…”

Section: Jhep02(2014)041mentioning

confidence: 99%

See 2 more Smart Citations

Statistical issues in the parton distribution analysis of the Tevatron jet data

Alekhin

Blümlein

Moch

2014

J. High Energ. Phys.

Self Cite

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We analyse a tension between the D0 and CDF inclusive jet data and the perturbative QCD calculations, which are based on the ABKM09 and ABM11 parton distribution functions (PDFs) within the nuisance parameter framework. Particular attention is paid on the uncertainties in the nuisance parameters due to the data fluctuations and the PDF errors. We show that with account of these uncertainties the nuisance parameters corresponding to the luminosity uncertainties in the D0 and the CDF data sets take the values r D0 norm = 4.1 ± 1.3 and r CDF norm = 5.4 ± 1.7, respectively, while dropping luminosity uncertainty leads to variation of the PDFs well within uncertainties. A statistical bias of the estimator based on the nuisance parameters is also discussed.

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Associated Production of W + Charm in 13 TeV Proton-Proton Collisions Measured with CMS and Determination of the Strange Quark Content of the Proton

Pflitsch¹

2020

Springer Theses

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In dieser Arbeit wird die Messung der assoziierten Produktion eines W ± Bosons und eines Charm-Quarks in Proton-Proton Kollisionen am LHC bei einer Schwerpunktsenergie von 13 TeV vorgestellt. Der Datensatz der in dieser Analyse verwendet wird, wurde durch das CMS Experiment am CERN LHC aufgezeichnet und entspricht einer integrierten Luminosität von 35.7 fb −1. Die W ± Bosonen werden durch das Vorhandensein eines Myons und eines Neutrinos im Endzustand identifiziert, wobei sich die Präsenz des Letztgenannten aus dem fehlenden Transversalimpuls innerhalb eines Events ableiten lässt. Charm-Quarks werden durch die vollständige Reconstruktion von D * (2010) ± Mesonen identifiziert, welche dem Zerfallskanal D * (2010) ± → D 0 + π ± → K ∓ +π ± +π ± folgen. Der Phasenraum dieser Messung ist durch den Transversalimpuls des Myons p µ T > 26 GeV, die Pseudorapidität des Myons |η µ | < 2.4 und den Transversalimpuls des Charm-Quarks p c T > 5 GeV bestimmt. Die Messung wird sowohl inclusiv, als auch differentiell, als eine Funktion der absoluten Pseudorapidität des Myons aus dem Zerfall des W ± Bosons, durchgeführt. Die Ergebnisse werden mit theoretischen Vorhersagen verglichen, bei denen verschiedene Sets an Parton-Verteilungsfunktionen, eng. parton distribution functions (PDF) verwendet werden. In einer anschließenden QCD-Analyse wird der Strange-Quark Anteil im Proton bestimmt und die Auswirkung der neuen Messung auf die Unsicherheiten der Partonverteilung untersucht. Die daraus resultierende Strange-Quark Verteilung des Protons wird mit jenen verglichen, die in globalen PDF Fits aus den Daten von Neutrino-Streuexperimenten bestimmt wurden.

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Parton distribution functions and benchmark cross sections at next-to-next-to-leading order

Cited by 329 publications

References 192 publications

Measurement of the high-mass Drell–Yan differential cross-section in pp collisions at s=7 TeV with the ATLAS detector

Measurement of the high-mass Drell–Yan differential cross-section in pp collisions at s=7 TeV with the ATLAS detector

Statistical issues in the parton distribution analysis of the Tevatron jet data

Associated Production of W + Charm in 13 TeV Proton-Proton Collisions Measured with CMS and Determination of the Strange Quark Content of the Proton

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