Parton distributions with LHC data

Ball, Richard D.; Bertone, Valerio; Carrazza, Stefano; Deans, Christopher S.; Debbio, Luigi Del; Forte, Stefano; Guffanti, A.; Hartland, Nathan P.; Latorre, José I.; Rojo, Juan; Ubiali, Maria

doi:10.1016/j.nuclphysb.2012.10.003

Cited by 1,551 publications

(1,305 citation statements)

References 76 publications

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“…It can be seen in Fig. 3 that the deviations between the MSTW2008 [2] and the CT10 [22], HERAPDF1.5 [38] and NNPDF2.3 [44] predictions are covered by the total uncertainty band assigned to the MSTW2008 prediction, which is dominated by the combined 68% confidence level (CL) PDF and α s variation.…”

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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“…The bottom-left image of Fig. 3 shows the comparison between NNPDF2.3 NLO [4], CT10 NLO [13] and MSTW2008 NLO [14] sets at Q = 1 GeV.…”

Section: Resultsmentioning

confidence: 99%

APFEL Web: a web-based application for the graphical visualization of parton distribution functions

Carrazza

Ferrara

Palazzo

et al. 2015

J. Phys. G: Nucl. Part. Phys.

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Abstract. We present APFEL Web, a Web-based application designed to provide a flexible user-friendly tool for the graphical visualization of parton distribution functions (PDFs). In this note we describe the technical design of the APFEL Web application, motivating the choices and the framework used for the development of this project. We document the basic usage of APFEL Web and show how it can be used to provide useful input for a variety of collider phenomenological studies. Finally we provide some examples showing the output generated by the application.

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“…Signal events from Z 0 B , Z 0 -2HDM, and the heavy-scalar models are generated using MADGRAPH_AMC@NLO 2.2.3 [20] at LO in quantum chromodynamics (QCD) using the NNPDF3.0LO [21] parton distribution function (PDF) set. Parton showering and hadronization are handled by the PYTHIA 8.186 [22] event generator with the A14 [23] set of tuned parameters (tune), using the NNPDF2.3LO PDF set [24]. MC samples for the Z 0 B model are generated assuming a DM mass m χ between 1 and 1000 GeV and a range of mediator masses m Z 0 B between 1 and 2000 GeV.…”

Section: Data and Simulation Samplesmentioning

confidence: 99%

Search for dark matter in association with a Higgs boson decaying to two photons at s=13 TeV with the ATLAS detector

Aaboud¹,

Aad²,

Abbott³

et al. 2017

Phys. Rev. D

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A search for dark matter in association with a Higgs boson decaying to two photons is presented. This study is based on data collected with the ATLAS detector, corresponding to an integrated luminosity of 36.1 fb −1 of proton-proton collisions at the LHC at a center-of-mass energy of 13 TeV in 2015 and 2016. No significant excess over the expected background is observed. Upper limits at 95% confidence level are set on the visible cross section for beyond the Standard Model physics processes, and the production cross section times branching fraction of the Standard Model Higgs boson decaying into two photons in association with missing transverse momentum in three different benchmark models. Limits at 95% confidence level are also set on the observed signal in two-dimensional mass planes. Additionally, the results are interpreted in terms of 90% confidence-level limits on the dark-matternucleon scattering cross section, as a function of the dark-matter particle mass, for a spin-independent scenario.

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Parton distributions with LHC data

Cited by 1,551 publications

References 76 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

APFEL Web: a web-based application for the graphical visualization of parton distribution functions

Search for dark matter in association with a Higgs boson decaying to two photons at s=13 TeV with the ATLAS detector

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