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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.


Related in: MedlinePlus

Non-perturbative correction factors for the cross-section ratios, ρ(y,xT) and ρ(y,pT), for anti-kt jets with R=0.4 or R=0.6 shown for a jet rapidity of /y/<0.3 for Monte Carlo simulations with various tunes as a function of the jet xT and of the jet pT, respectively. The correction factors derived from Pythia 6 with the AUET2B CTEQ6L1 tune (full-square) are used for the NLO pQCD prediction in this measurement, with the uncertainty indicated by the shaded area. For better visibility, some tunes used in the uncertainty determination are not shown
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Fig4: Non-perturbative correction factors for the cross-section ratios, ρ(y,xT) and ρ(y,pT), for anti-kt jets with R=0.4 or R=0.6 shown for a jet rapidity of /y/<0.3 for Monte Carlo simulations with various tunes as a function of the jet xT and of the jet pT, respectively. The correction factors derived from Pythia 6 with the AUET2B CTEQ6L1 tune (full-square) are used for the NLO pQCD prediction in this measurement, with the uncertainty indicated by the shaded area. For better visibility, some tunes used in the uncertainty determination are not shown

Mentions: Non-perturbative corrections to ρ(y,xT) have a different xT dependence for jets with R=0.4 and R=0.6, as shown in Figs. 4(a) and 4(b). The behaviour of ρ(y,xT) is driven by the corrections for the cross-section at since in the same xT bins (see Appendix A) and since the non-perturbative correction is almost flat in the high-pT region. For jets with R=0.4, the correction is −10 % in the lowest xT bin. For R=0.6, the correction in this region is in the opposite direction, increasing the prediction by +10 %. The uncertainty in the lowest xT bin for both radius parameters is ∼ ±10 %. The non-perturbative corrections to ρ(y,pT) are shown in Figs. 4(c) and 4(d), where a similar pT dependence for R=0.4 and R=0.6 is found. They amount to −10 % for jets with R=0.4 and −25 % for jets with R=0.6 in the lowest pT bins. This is due to the correction factors for the NLO pQCD prediction at  [25] being larger than those at . Corrections obtained from Pythia with various tunes generally agree within 5 % for central jets, while the non-perturbative corrections from Herwig++ deviate from the ones of the Pythia tunes by more than 10 % in the lowest pT bin. Fig. 4


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)

Non-perturbative correction factors for the cross-section ratios, ρ(y,xT) and ρ(y,pT), for anti-kt jets with R=0.4 or R=0.6 shown for a jet rapidity of /y/<0.3 for Monte Carlo simulations with various tunes as a function of the jet xT and of the jet pT, respectively. The correction factors derived from Pythia 6 with the AUET2B CTEQ6L1 tune (full-square) are used for the NLO pQCD prediction in this measurement, with the uncertainty indicated by the shaded area. For better visibility, some tunes used in the uncertainty determination are not shown
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4400855&req=5

Fig4: Non-perturbative correction factors for the cross-section ratios, ρ(y,xT) and ρ(y,pT), for anti-kt jets with R=0.4 or R=0.6 shown for a jet rapidity of /y/<0.3 for Monte Carlo simulations with various tunes as a function of the jet xT and of the jet pT, respectively. The correction factors derived from Pythia 6 with the AUET2B CTEQ6L1 tune (full-square) are used for the NLO pQCD prediction in this measurement, with the uncertainty indicated by the shaded area. For better visibility, some tunes used in the uncertainty determination are not shown
Mentions: Non-perturbative corrections to ρ(y,xT) have a different xT dependence for jets with R=0.4 and R=0.6, as shown in Figs. 4(a) and 4(b). The behaviour of ρ(y,xT) is driven by the corrections for the cross-section at since in the same xT bins (see Appendix A) and since the non-perturbative correction is almost flat in the high-pT region. For jets with R=0.4, the correction is −10 % in the lowest xT bin. For R=0.6, the correction in this region is in the opposite direction, increasing the prediction by +10 %. The uncertainty in the lowest xT bin for both radius parameters is ∼ ±10 %. The non-perturbative corrections to ρ(y,pT) are shown in Figs. 4(c) and 4(d), where a similar pT dependence for R=0.4 and R=0.6 is found. They amount to −10 % for jets with R=0.4 and −25 % for jets with R=0.6 in the lowest pT bins. This is due to the correction factors for the NLO pQCD prediction at  [25] being larger than those at . Corrections obtained from Pythia with various tunes generally agree within 5 % for central jets, while the non-perturbative corrections from Herwig++ deviate from the ones of the Pythia tunes by more than 10 % in the lowest pT bin. Fig. 4

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