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Measurement of the inclusive jet cross-section in pp collisions at [Formula: see text] and comparison to the inclusive jet cross-section at [Formula: see text] using the ATLAS detector.

- Eur Phys J C Part Fields (2013)

Bottom Line: The inclusive jet double-differential cross-section is presented as a function of the jet transverse momentum p T and jet rapidity y, covering a range of 20≤p T<430 GeV and /y/<4.4.The systematic uncertainties on the ratios are significantly reduced due to the cancellation of correlated uncertainties in the two measurements.Results are compared to the prediction from next-to-leading order perturbative QCD calculations corrected for non-perturbative effects, and next-to-leading order Monte Carlo simulation.

View Article: PubMed Central - PubMed

Affiliation: Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, Germany.

ABSTRACT

The inclusive jet cross-section has been measured in proton-proton collisions at [Formula: see text] in a dataset corresponding to an integrated luminosity of [Formula: see text] collected with the ATLAS detector at the Large Hadron Collider in 2011. Jets are identified using the anti-k t algorithm with two radius parameters of 0.4 and 0.6. The inclusive jet double-differential cross-section is presented as a function of the jet transverse momentum p T and jet rapidity y, covering a range of 20≤p T<430 GeV and /y/<4.4. The ratio of the cross-section to the inclusive jet cross-section measurement at [Formula: see text], published by the ATLAS Collaboration, is calculated as a function of both transverse momentum and the dimensionless quantity [Formula: see text], in bins of jet rapidity. The systematic uncertainties on the ratios are significantly reduced due to the cancellation of correlated uncertainties in the two measurements. Results are compared to the prediction from next-to-leading order perturbative QCD calculations corrected for non-perturbative effects, and next-to-leading order Monte Carlo simulation. Furthermore, the ATLAS jet cross-section measurements at [Formula: see text] and [Formula: see text] are analysed within a framework of next-to-leading order perturbative QCD calculations to determine parton distribution functions of the proton, taking into account the correlations between the measurements.

No MeSH data available.


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The uncertainty in the NLO pQCD prediction of the cross-section ratio ρ(y,xT) ((a)–(c)) and ρ(y,pT) ((d)–(f)), calculated using NLOJET++ with the CT10 PDF set, for anti-kt jets with R=0.6 shown in three representative rapidity bins as a function of the jet xT and of the jet pT, respectively. In addition to the total uncertainty, the uncertainties from the scale choice, the PDF set and the strong coupling constant, αS, are shown separately
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Fig3: The uncertainty in the NLO pQCD prediction of the cross-section ratio ρ(y,xT) ((a)–(c)) and ρ(y,pT) ((d)–(f)), calculated using NLOJET++ with the CT10 PDF set, for anti-kt jets with R=0.6 shown in three representative rapidity bins as a function of the jet xT and of the jet pT, respectively. In addition to the total uncertainty, the uncertainties from the scale choice, the PDF set and the strong coupling constant, αS, are shown separately

Mentions: Figures 3(a)–(c) show the uncertainty on the NLO pQCD calculation of ρ(y,xT) in representative rapidity bins for R=0.6. They are significantly reduced to a level of a few percent in the central rapidity region compared to the uncertainties on the cross-sections shown in Fig. 1. The dominant uncertainty at low pT is the uncertainty on the renormalisation and factorisation scale choice, while at high pT the uncertainty due to the PDF contributes again significantly. The NLO pQCD calculation of ρ(y,pT) has an uncertainty of less than ±5 % for pT up to 200  GeV in the central rapidity region, as shown in Fig. 3(d). The uncertainty increases for higher pT of the jet due mostly to the uncertainties on the PDFs, which are below 10 % for central jets. In the forward region, it reaches up to 80 % in the highest pT bins, as shown in Figs. 3(e) and 3(f). The corresponding uncertainties for jets with R=0.4 are similar, except for a larger contribution due to the scale choice in the uncertainty on ρ(y,pT). Fig. 3


Measurement of the inclusive jet cross-section in pp collisions at [Formula: see text] and comparison to the inclusive jet cross-section at [Formula: see text] using the ATLAS detector.

- Eur Phys J C Part Fields (2013)

The uncertainty in the NLO pQCD prediction of the cross-section ratio ρ(y,xT) ((a)–(c)) and ρ(y,pT) ((d)–(f)), calculated using NLOJET++ with the CT10 PDF set, for anti-kt jets with R=0.6 shown in three representative rapidity bins as a function of the jet xT and of the jet pT, respectively. In addition to the total uncertainty, the uncertainties from the scale choice, the PDF set and the strong coupling constant, αS, are shown separately
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4400855&req=5

Fig3: The uncertainty in the NLO pQCD prediction of the cross-section ratio ρ(y,xT) ((a)–(c)) and ρ(y,pT) ((d)–(f)), calculated using NLOJET++ with the CT10 PDF set, for anti-kt jets with R=0.6 shown in three representative rapidity bins as a function of the jet xT and of the jet pT, respectively. In addition to the total uncertainty, the uncertainties from the scale choice, the PDF set and the strong coupling constant, αS, are shown separately
Mentions: Figures 3(a)–(c) show the uncertainty on the NLO pQCD calculation of ρ(y,xT) in representative rapidity bins for R=0.6. They are significantly reduced to a level of a few percent in the central rapidity region compared to the uncertainties on the cross-sections shown in Fig. 1. The dominant uncertainty at low pT is the uncertainty on the renormalisation and factorisation scale choice, while at high pT the uncertainty due to the PDF contributes again significantly. The NLO pQCD calculation of ρ(y,pT) has an uncertainty of less than ±5 % for pT up to 200  GeV in the central rapidity region, as shown in Fig. 3(d). The uncertainty increases for higher pT of the jet due mostly to the uncertainties on the PDFs, which are below 10 % for central jets. In the forward region, it reaches up to 80 % in the highest pT bins, as shown in Figs. 3(e) and 3(f). The corresponding uncertainties for jets with R=0.4 are similar, except for a larger contribution due to the scale choice in the uncertainty on ρ(y,pT). Fig. 3

Bottom Line: The inclusive jet double-differential cross-section is presented as a function of the jet transverse momentum p T and jet rapidity y, covering a range of 20≤p T<430 GeV and /y/<4.4.The systematic uncertainties on the ratios are significantly reduced due to the cancellation of correlated uncertainties in the two measurements.Results are compared to the prediction from next-to-leading order perturbative QCD calculations corrected for non-perturbative effects, and next-to-leading order Monte Carlo simulation.

View Article: PubMed Central - PubMed

Affiliation: Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, Germany.

ABSTRACT

The inclusive jet cross-section has been measured in proton-proton collisions at [Formula: see text] in a dataset corresponding to an integrated luminosity of [Formula: see text] collected with the ATLAS detector at the Large Hadron Collider in 2011. Jets are identified using the anti-k t algorithm with two radius parameters of 0.4 and 0.6. The inclusive jet double-differential cross-section is presented as a function of the jet transverse momentum p T and jet rapidity y, covering a range of 20≤p T<430 GeV and /y/<4.4. The ratio of the cross-section to the inclusive jet cross-section measurement at [Formula: see text], published by the ATLAS Collaboration, is calculated as a function of both transverse momentum and the dimensionless quantity [Formula: see text], in bins of jet rapidity. The systematic uncertainties on the ratios are significantly reduced due to the cancellation of correlated uncertainties in the two measurements. Results are compared to the prediction from next-to-leading order perturbative QCD calculations corrected for non-perturbative effects, and next-to-leading order Monte Carlo simulation. Furthermore, the ATLAS jet cross-section measurements at [Formula: see text] and [Formula: see text] are analysed within a framework of next-to-leading order perturbative QCD calculations to determine parton distribution functions of the proton, taking into account the correlations between the measurements.

No MeSH data available.


Related in: MedlinePlus