# Pinning down the large-x gluon with NNLO top-quark pair differential distributions

Michał Czakon, Nathan P. Hartland, Alexander Mitov, Emanuele R. Nocera, Juan Rojo

### Abstract

Top-quark pair production at the LHC is directly sensitive to the gluon PDF at large x. While total cross-section data is already included in several PDF determinations, differential distributions are not, because the corresponding NNLO calculations have become available only recently. In this work we study the impact on the large-x gluon of top-quark pair differential distributions measured by ATLAS and CMS at $\sqrt{s}=8$ TeV. Our analysis, performed in the NNPDF3.0 framework at NNLO accuracy, allows us to identify the optimal combination of LHC top-quark pair measurements that maximize the constraints on the gluon, as well as to assess the compatibility between ATLAS and CMS data. We find that differential distributions from top-quark pair production provide significant constraints on the large-x gluon, comparable to those obtained from inclusive jet production data, and thus should become an important ingredient for the next generation of global PDF fits.
Original language English Journal of High Energy Physics https://doi.org/10.1007/JHEP04(2017)044 Published - 25 Nov 2016

quarks
pair production
ingredients
compatibility
cross sections

### Bibliographical note

42 pages, 21 figures, 11 tables, this version match the version accepted for publication in JHEP

• hep-ph
• hep-ex

### Cite this

Czakon, Michał ; Hartland, Nathan P. ; Mitov, Alexander ; Nocera, Emanuele R. ; Rojo, Juan. / Pinning down the large-x gluon with NNLO top-quark pair differential distributions. In: Journal of High Energy Physics. 2016.
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title = "Pinning down the large-x gluon with NNLO top-quark pair differential distributions",
abstract = "Top-quark pair production at the LHC is directly sensitive to the gluon PDF at large x. While total cross-section data is already included in several PDF determinations, differential distributions are not, because the corresponding NNLO calculations have become available only recently. In this work we study the impact on the large-x gluon of top-quark pair differential distributions measured by ATLAS and CMS at $\sqrt{s}=8$ TeV. Our analysis, performed in the NNPDF3.0 framework at NNLO accuracy, allows us to identify the optimal combination of LHC top-quark pair measurements that maximize the constraints on the gluon, as well as to assess the compatibility between ATLAS and CMS data. We find that differential distributions from top-quark pair production provide significant constraints on the large-x gluon, comparable to those obtained from inclusive jet production data, and thus should become an important ingredient for the next generation of global PDF fits.",
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author = "Michał Czakon and Hartland, {Nathan P.} and Alexander Mitov and Nocera, {Emanuele R.} and Juan Rojo",
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Pinning down the large-x gluon with NNLO top-quark pair differential distributions. / Czakon, Michał; Hartland, Nathan P.; Mitov, Alexander; Nocera, Emanuele R.; Rojo, Juan.

In: Journal of High Energy Physics, 25.11.2016.

TY - JOUR

T1 - Pinning down the large-x gluon with NNLO top-quark pair differential distributions

AU - Czakon, Michał

AU - Hartland, Nathan P.

AU - Mitov, Alexander

AU - Nocera, Emanuele R.

AU - Rojo, Juan

N1 - 42 pages, 21 figures, 11 tables, this version match the version accepted for publication in JHEP

PY - 2016/11/25

Y1 - 2016/11/25

N2 - Top-quark pair production at the LHC is directly sensitive to the gluon PDF at large x. While total cross-section data is already included in several PDF determinations, differential distributions are not, because the corresponding NNLO calculations have become available only recently. In this work we study the impact on the large-x gluon of top-quark pair differential distributions measured by ATLAS and CMS at $\sqrt{s}=8$ TeV. Our analysis, performed in the NNPDF3.0 framework at NNLO accuracy, allows us to identify the optimal combination of LHC top-quark pair measurements that maximize the constraints on the gluon, as well as to assess the compatibility between ATLAS and CMS data. We find that differential distributions from top-quark pair production provide significant constraints on the large-x gluon, comparable to those obtained from inclusive jet production data, and thus should become an important ingredient for the next generation of global PDF fits.

AB - Top-quark pair production at the LHC is directly sensitive to the gluon PDF at large x. While total cross-section data is already included in several PDF determinations, differential distributions are not, because the corresponding NNLO calculations have become available only recently. In this work we study the impact on the large-x gluon of top-quark pair differential distributions measured by ATLAS and CMS at $\sqrt{s}=8$ TeV. Our analysis, performed in the NNPDF3.0 framework at NNLO accuracy, allows us to identify the optimal combination of LHC top-quark pair measurements that maximize the constraints on the gluon, as well as to assess the compatibility between ATLAS and CMS data. We find that differential distributions from top-quark pair production provide significant constraints on the large-x gluon, comparable to those obtained from inclusive jet production data, and thus should become an important ingredient for the next generation of global PDF fits.

KW - hep-ph

KW - hep-ex

U2 - 10.1007/JHEP04(2017)044

DO - 10.1007/JHEP04(2017)044

M3 - Article

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

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