Implications of CTEQ global analysis for collider observables

Nadolsky, Pavel; Lai, Henry; Cao, Qing; Huston, J.; Pumplin, Jon; Stump, Daniel R.; Tung, W. K.; Yuan, C. P.

doi:10.1103/physrevd.78.013004

Cited by 1,223 publications

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“…The uncertainty of 0.94 GeV on m t [40] is propagated to the final result using two alpgen+pythia samples generated with different m t values. We determine PDF uncertainties by varying the 20 parameters describing the CTEQ6M1 PDF [35] within their uncertainties.…”

Section: A Uncertainties On Signalmentioning

confidence: 99%

“…We use a sample generated with alpgen [37] interfaced to pythia 6.4 [38] for showering and hadronization and a sample generated with alpgen interfaced to herwig 6.510. For both samples we use cteq6l1 PDFs [35].…”

Section: A Signalmentioning

confidence: 99%

“…To simulate the tt signal, we employ MC events generated with the CTEQ6M1 parton distribution functions (PDFs) [35] and mc@nlo 3.4 [21,22] interfaced to herwig 6.510 [36] for showering and hadronization. Alternate signal MC samples are generated to study systematic uncertainties and the shape of the ∆y tt distribution.…”

Section: A Signalmentioning

confidence: 99%

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Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states fromtt¯production at the Tevatron

Abazov¹,

Abbott²,

Acharya³

et al. 2015

Phys. Rev. D

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We present a simultaneous measurement of the forward-backward asymmetry and the top-quark polarization in tt production in dilepton final states using 9.7 fb −1 of proton-antiproton collisions at √ s = 1.96 TeV with the D0 detector. To reconstruct the distributions of kinematic observables we employ a matrix element technique that calculates the likelihood of the possible tt kinematic configurations. After accounting for the presence of background events and for calibration effects, we obtain a forward-backward asymmetry of A tt = (15.0 ± 6.4 (stat) ± 4.9 (syst))% and a top-quark polarization times spin analyzing power in the beam basis of κP = (7.2 ± 10.5 (stat) ± 4.2 (syst))%, with a correlation of −56% between the measurements. If we constrain the forward-backward asymmetry to its expected standard model value, we obtain a measurement of the top polarization of κP = (11.3±9.1 (stat)±1.9 (syst))%. If we constrain the top polarization to its expected standard model value, we measure a forward-backward asymmetry of A tt = (17.5 ± 5.6 (stat) ± 3.1 (syst))%. A combination with the D0 A tt measurement in the lepton+jets final state yields an asymmetry of A tt = (11.8 ± 2.5 (stat) ± 1.3 (syst))%. Within their respective uncertainties, all these results are consistent with the standard model expectations.

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Section: A Uncertainties On Signalmentioning

confidence: 99%

Section: A Signalmentioning

confidence: 99%

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Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states fromtt¯production at the Tevatron

Abazov¹,

Abbott²,

Acharya³

et al. 2015

Phys. Rev. D

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“…[20], the combined 90% CL PDF+∆ exp α s + ∆ th α s uncertainty on σ NNLO gg→H at the 7 TeV LHC was found to be of order 10%. However, this method does not account for the theoretical assumptions that enter into the parametrization of the PDFs; a way to access this theoretical uncertainty is to compare the results for the central values of the cross section with the best-fit PDFs when using different parameterizations [53] as shown in the right panel of Fig. 4.…”

Section: (Left)mentioning

confidence: 99%

Higgs physics: Theory

Djouadi

2012

Pramana - J Phys

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Abstract. I review the theoretical aspects of the physics of Higgs bosons, focusing on the elements that are relevant for the production and detection at present hadron colliders. After briefly summarizing the basics of electroweak symmetry breaking in the Standard Model, I discuss Higgs production at the LHC and at the Tevatron, with some focus on the main production mechanism, the gluon-gluon fusion process, and summarize the main Higgs decay modes and the experimental detection channels. I then briefly survey the case of the minimal supersymmetric extension of the Standard Model. In a last section, I review the prospects for determining the fundamental properties of the Higgs particles once they have been experimentally observed.

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“…Since at LHC energies heavy quarks are mainly produced through gluon-gluon fusion processes (gg → QQ), charm production in pp collisions, in particular, could probe the gluon enhancement, expected in the low-x regime, arising from non-linear evolution of the parton densities [37]. Both calculations use CTEQ6.6 parton distribution functions, which do not include non-linear effects in the evolution towards small x [43]. Reaching p T = 1 GeV/c, this measurement probes the gluon distribution in the x range of a few 10 −4 and squared momentum transfer Q 2 ∼ (4 GeV) 2 , but with the current uncertainties of the experimental measurement and of the theoretical predictions, it is not possible to draw conclusions about small-x gluon saturation effects.…”

Section: Heavy-flavour Production In Pp Collisionsmentioning

confidence: 99%

Measurement of the D0 Meson Production in Pb–Pb and p–Pb Collisions

Festanti

2016

Springer Theses

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This thesis presents the measurement of the charmed D 0 meson production relative to the reaction plane in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon collision of √ s NN = 2.76 TeV, and the measurement of the D 0 production in p-Pb collisions at √ s NN = 5.02 TeV with the ALICE detector at the CERN Large Hadron Collider.The D 0 azimuthal anisotropy with respect to the reaction plane is sensitive to the interaction of the charm quarks with the high-density strongly-interacting medium formed in ultra-relativistic heavy-ion collisions and, thus, to the properties of this state of matter. In particular, this observable allows to establish whether low-momentum charm quarks participate in the collective expansion of the system and whether they can reach thermal equilibrium with the medium constituents. The azimuthal anisotropy is quan- −0.036 in the interval 2 < p T < 6 GeV/c, which decreases towards more central collisions. Consequently, the nuclear modification factor shows a stronger suppression in the direction orthogonal to the reaction plane. The v 2 and the R AA measured in two azimuthal regions with respect to the reaction plane are compared to theoretical calculations of charm quark transport and energy loss in high-density strongly-interacting matter. The models that include substantial elastic interactions with an expanding medium provide a good description of the observed anisotropy.The D 0 nuclear modification factor R pPb in p-Pb collisions is compatible with unity within uncertainties. The measured R pPb is compared to theoretical models including initial state effects, as well as to the nuclear modification factor measured in central RiassuntoLa tesi presenta la misura della produzione di mesoni D 0 rispetto al piano di reazione in collisioni Pb-Pb all'energia nel centro di massa di √ s NN = 2.76 TeV per coppia di nucleoni e la misura della produzione di D 0 in collisioni p-Pb all'energia di √ s NN = 5.02 TeV con l'esperimento ALICE situato al Large Hadron Collider del CERN.L'anisotropia azimutale dei mesoni D 0 rispetto al piano di reazioneè sensibile alle interazioni del quark charm con il mezzo ad alta densità e fortemente interagente prodotto in collisioni tra ioni pesanti ad energia ultra-relativistica e, di conseguenza, alle proprietà di questo stato della materia. In particolare, permette di stabilire se i quark charm partecipano all'espansione collettiva del sistema e se raggiungono l'equilibrio termico con i costituenti del mezzo. L'anisotropia azimutaleè quantificata tramite il secondo coefficiente v 2 dello sviluppo in serie di Fourier della distribuzione azimutale dei mesoni D 0 e tramite la misura del fattore di modifica nucleare R AA nel piano di reazione e nella direzione ortogonale ad esso. La misura della produzione di D 0 in collisioni p-Pb permette di studiare gli effetti indotti dalla materia nucleare fredda, in modo da poterli distinguere da quelli indotti dal mezzo denso fortemente interagente prodotto in collisioni Pb-Pb.La produzione di mesoni D 0...

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Implications of CTEQ global analysis for collider observables

Cited by 1,223 publications

References 102 publications

Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states fromtt¯production at the Tevatron

Simultaneous measurement of forward-backward asymmetry and top polarization in dilepton final states fromtt¯production at the Tevatron

Higgs physics: Theory

Measurement of the D0 Meson Production in Pb–Pb and p–Pb Collisions

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