Parton distributions for the LHC
R. S. Thorne,W. J. Stirling,Alan D. Martin,G. Watt +3 more
- 01 Jan 2007
pp 305-308
TL;DR: In this paper, a preliminary set of updated NLO parton distributions and their uncertainties determined from CCFR and NuTeV dimuon cross sections are presented, along with additional jet data from HERA and the Tevatron.
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Abstract: We present a preliminary set of updated NLO parton distributions. For the first time we have a quantitative extraction of the strange quark and antiquark distributions and their uncertainties determined from CCFR and NuTeV dimuon cross sections. Additional jet data from HERA and the Tevatron improve our gluon extraction. Lepton asymmetry data and neutrino structure functions improve the flavour separation, particularly constraining the down quark valence distribution.
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Figures
Figure 24: The reduced cross section σ̃(x,Q2) for a selection of HERA data and the structure function F2(x,Q 2) for a selection of fixed-target data. The curves represent σ̃(x,Q2), evaluated at the HERA centre-of-mass energy, and so for the high x and low Q2 values corresponding to fixed-target data, y is negligible and the curves effectively represent the required F2(x,Q 2). The normalisations of data sets are those in the best fit at NNLO, found in Table 3. These are very similar to those at NLO, but at LO the HERA data would be 0.5–1% lower in general. 
Figure 68: W ≡ W+ + W− and Z total cross sections at the LHC (√s = 14 TeV). The error ellipses, calculated using the one-sigma error sets, are shown for the MSTW 2008 NLO and NNLO PDFs. ![Figure 44: A comparison of theory and data for W → µν charge asymmetry from DØ [49].](/figures/figure44-1-445qpxeeihpi.png)
Figure 44: A comparison of theory and data for W → µν charge asymmetry from DØ [49]. 
Figure 70: Ratio of parton luminosities at √ s = 10 TeV compared to √ s = 14 TeV at the LHC, using the MSTW 2008 NLO PDFs including the one-sigma uncertainty bands. 
Figure 7: Probability density function of the χ2-distribution with 163 degrees of freedom. 
Figure 59: Predictions for the longitudinal proton structure function, FL(x,Q 2), using NNLO PDFs and LO, NLO and NNLO coefficient functions.
![Figure 44: A comparison of theory and data for W → µν charge asymmetry from DØ [49].](/figures/figure44-1-445qpxeeihpi.webp)
Citations
Regularized Unfolding of Jet Cross Sections in Deep-Inelastic $ep$ Scattering at HERA and Determination of the Strong Coupling Constant
Daniel Andreas Britzger
- 14 Nov 2013
TL;DR: In this article, double-differential cross sections for jet production in neutral current deepinelastic e±p scattering (DIS) are presented at the center-of-mass energy of √ s = 319 GeV, and in the kinematic range of the squared four-momentum transfer 150 < Q < 15 000 GeV and the inelasticity 0.2 < y < 0.7.
11
Two-loop splitting in double parton distributions: the colour non-singlet case
TL;DR: In this paper, double parton distributions receive their dominant contribution from the splitting of a single parton at small interparton distances, and they compute this mechanism at next-to-leading order in perturbation theory for all colour configurations of the observed parton pair.
Flavor asymmetry of the nucleon sea and W-boson production
TL;DR: In this paper, the advantage and feasibility of using W -boson production to extract unique information on the flavor asymmetry of the u ¯ and d ¯ seaquark distributions in the proton are examined.
11
Search for low-scale gravity signatures in multi-jet final states with the ATLAS detector at √s = 8 TeV
Томский государственный университет Радиофизический факультет Научные подразделения Рфф
- 01 Jan 2015
TL;DR: In this article, a search for evidence of physics beyond the Standard Model in final states with multiple high-transverse-momentum jets is performed using 20.3 fb−1 of proton-proton collision data at √ s = 8 TeV recorded by the ATLAS detector at the LHC.
11
Next-to-Leading Order QCD Corrections to Heavy-Flavour Production in Neutral Current DIS
TL;DR: In this article, an overview of all steps that are required for the production of heavy quarks in deeply inelastic scattering (DIS) can be seen as an illustrative example in the framework of perturbative Quantum Chromo Dynamics (pQCD).
11
References
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TL;DR: This section discusses a particular type of low-pass filter, well-adapted for data smoothing, and termed variously Savitzky-Golay, least-squares, or DISPO (Digital Smoothing Polynomial) filters.
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A method for the solution of certain non – linear problems in least squares
TL;DR: In this article, the problem of least square problems with non-linear normal equations is solved by an extension of the standard method which insures improvement of the initial solution, which can also be considered an extension to Newton's method.
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
Johan Alwall,Rikkert Frederix,Stefano Frixione,Valentin Hirschi,Fabio Maltoni,Olivier Mattelaer,Hua-Sheng Shao,Tim Stelzer,Paolo Torrielli,Marco Zaro,Marco Zaro +10 more
TL;DR: MadGraph5 aMC@NLO as discussed by the authors is a computer program capable of handling all these computations, including parton-level fixed order, shower-matched, merged, in a unified framework whose defining features are flexibility, high level of parallelisation and human intervention limited to input physics quantities.