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An NLO QCD analysis of inclusive cross-section and jet-production data from the ZEUS experiment
High Energy Physics - Phenomenology · Submitted 29 Mar 2005
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The input of jet data constrains the gluon and allows an accurate extraction of \alpha_s(M_Z) at NLO; \alpha_s(M_Z) = 0.1183 \pm 0.0028(exp.) \pm 0.0008(model) An additional uncertainty from the choice of scales is estimated as \pm 0.005.
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The abstract, sentence by sentence
The ZEUS inclusive differential cross-section data from HERA, for charged and neutral current processes taken with e+ and e- beams, together with differential cross-section data on inclusive jet production in e+ p scattering and dijet production in \gamma p scattering, have been used in a new NLO QCD analysis to extract the parton distribution functions of the proton. The input of jet data constrains the gluon and allows an accurate extraction of \alpha_s(M_Z) at NLO; \alpha_s(M_Z) = 0.1183 \pm 0.0028(exp.) \pm 0.0008(model) An additional uncertainty from the choice of scales is estimated as \pm 0.005. This is the first extraction of \alpha_s(M_Z) from HERA data alone.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The ZEUS inclusive differential cross-section data from HERA, for charged and neutral current processes taken with e+ and e- beams, together with differential cross-section data on inclusive jet production in e+ p scattering and dijet production in \gamma p scattering, have been used in a new NLO QCD analysis to extract the parton distribution functions of the proton. | method 0.80 | 0.72 | 0.11 | asserted 1.00 |
| s1 | The input of jet data constrains the gluon and allows an accurate extraction of \alpha_s(M_Z) at NLO; \alpha_s(M_Z) = 0.1183 \pm 0.0028(exp.) \pm 0.0008(model) An additional uncertainty from the choice of scales is estimated as \pm 0.005. | result 0.97 | 0.92 | 0.55 | asserted 1.00 |
| s2 | This is the first extraction of \alpha_s(M_Z) from HERA data alone. | contribution 0.78 | 0.89 | 0.19 | asserted 1.00 |
What was examined, and what was not
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The paper
Original abstract
The ZEUS inclusive differential cross-section data from HERA, for charged and neutral current processes taken with e+ and e- beams, together with differential cross-section data on inclusive jet production in e+ p scattering and dijet production in \gamma p scattering, have been used in a new NLO QCD analysis to extract the parton distribution functions of the proton. The input of jet data constrains the gluon and allows an accurate extraction of \alpha_s(M_Z) at NLO; \alpha_s(M_Z) = 0.1183 \pm 0.0028(exp.) \pm 0.0008(model) An additional uncertainty from the choice of scales is estimated as \pm 0.005. This is the first extraction of \alpha_s(M_Z) from HERA data alone.
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References
How the literature uses it
17 arXiv papers cite this in 33 sentences
Papers citing it · 16 sentences without a confident label
Uses its method or tool 3 papers
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The prescription used by the ZEUS collaboration for the ZEUS JETS fit [ref] has been adopted.
DISPred - a program to calculate deep inelastic scattering cross sections · Reduced and Double Differential Cross Sections · 0.98
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We use a flavor decomposition similar to [ref] as follows: $xd_val$, $xu_val$, $xΔ=xu̅-xd̅$, $xS=2(xu̅+xd̅+xs̅+xc̅+xb̅)$ where $c$ and $b$ quark densities are zero at the scales below their corresponding thresholds.
Parton Distribution Uncertainties using Smoothness Prior · QCD Analysis Settings · 0.90
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This method was used in some previous ZEUS fits [ref] , and is used for the three “procedural” systematic uncertainties in the HERAPDF1.0 fit [ref] .
Structure Functions · Parton Fitting and Uncertainties · 0.94
Compares with it 2 papers
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H1prelim-08-045.fig6a.eps0.435 H1prelim-08-045.fig6b.eps0.5qcdfits Published H1 and ZEUS QCD fits (left) [ref] compared to the new analysis using the combined HERA data (right) [ref] .
Proton Structure Measurements and the HERAPDF fit · Combination of HERA cross section data and QCD Fit · 1.00
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We also compare in Fig. [ref] to the high-$x$ gluon distribution of the ZEUS 2005 Jets analysis [ref] , which is even smaller than our fit without the Tevatron jet data.
Parton distributions for the LHC · Impact on the gluon distribution · 1.00
Cites it as background 8 papers
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Such simultaneous determinations of and PDFs were performed using jet cross sections in DIS [ref] or jet cross sections at either the LHC or Tevatron [ref] .
Determination of the strong coupling constant $\alpha_s(M_Z)$ in next-to-next-to-leading order QCD using H1 jet cross section measurements · Introduction · 0.90
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Currently, the established method to obtain the PDFs, used by the major PDF collaborations (CTEQ [ref] and references within, MRST [ref] , Alekhin [ref] , Zeus [ref] and H1 [ref] ), is the global analysis supplemented with an error estimation using some kind of variant of the Hessian method (see e.g. [ref] for details).
New approach to the Parton Distribution Functions: Self-Organizing Maps · Introduction · 0.99
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Jet data have been included previously by the ZEUS Collaboration in their own PDF analysis [ref] .
Parton distributions for the LHC · Jet production at HERA · 0.89
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