A multidimensional unfolding method based on Bayes' theorem

D’Agostini, G.

doi:10.1016/0168-9002(95)00274-x

Cited by 1,001 publications

(599 citation statements)

References 2 publications

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“…The results obtained from the bin-by-bin correction are crosschecked using an iterative Bayesian approach [34] and found to be consistent. In addition, a consistency test is performed by correcting the MC@NLO signal sample using the PYTHIA-derived C DY factor.…”

Section: Bin-by-bin Correctionmentioning

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: Bin-by-bin Correctionmentioning

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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“…To measure the cross section, the background is subtracted bin-by-bin. The migration due to the p t resolution is corrected by a one-step Bayesian unfolding [20]. The data are corrected for the selection efficiency which includes acceptance, and is calculated bin-by-bin as the ratio of the number of fully simulated jets selected in PYTHIA over the number of generated jets, as formed by the KTCLUS algorithm applied to particles at generator level.…”

Section: Differential Cross Sectionmentioning

confidence: 99%

Inclusive jet production in two-photon collisions at LEP

Achard

Adriani

Alcaraz³

et al. 2004

Physics Letters B

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Inclusive jet production, e + e − → e + e − jet X, is studied using 560 pb −1 of data collected at LEP with the L3 detector at centre-of-mass energies between 189 and 209 GeV. The inclusive differential cross section is measured using a k t jet algorithm as a function of the jet transverse momentum, p t , in the range 3 < p t < 50 GeV for a pseudorapidity, η, in the range −1 < η < 1. This cross section is well represented by a power law. For high p t , the measured cross section is significantly higher than the NLO QCD predictions, as already observed for inclusive π ± and π 0 production.

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“…At p T 70 GeV, the correction becomes more important again and it reaches up to 6% at the highest p T . Track momentum resolution is corrected with an iterative Bayesian unfolding procedure [19]. Results are obtained with two iterations.…”

Section: Discussionmentioning

confidence: 99%

Measurement of the charged-hadron spectra and nuclear modification factor in lead–lead collisions with the ATLAS detector

Balek

2016

Nuclear and Particle Physics Proceedings

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The ATLAS experiment at the Large Hadron Collider (LHC) measures charged hadron spectra obtained in 2010 and 2011 lead-lead LHC data taking periods with total integrated statistics of 0.15 nb −1 . The results are compared to the pp spectra of charged hadrons at the same centre-of-mass energy based on the data sample with integrated luminosity of 4.2 pb −1 obtained by the ATLAS experiment in 2011 and 2013. This allows a detailed comparison of the two collision systems in a wide transverse momentum (0.5 < pT < 150 GeV) and pseudorapidity (|η| < 2) ranges in different centrality intervals of Pb+Pb collision. The nuclear modification factor RAA is presented in detail as a function of centrality, pT and η. It shows a distinct pT-dependence with a pronounced minimum at about 7 GeV. Above 60 GeV, it is consistent with a flat, centrality-dependent, value within the uncertainties. The value is 0.55 ± 0.01(stat.) ± 0.04(syst.) in the most central collisions. The RAA is observed to be consistent with flat |η| dependence over the whole transverse momentum range in all centrality classes.

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A multidimensional unfolding method based on Bayes' theorem

Cited by 1,001 publications

References 2 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

Inclusive jet production in two-photon collisions at LEP

Measurement of the charged-hadron spectra and nuclear modification factor in lead–lead collisions with the ATLAS detector

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