Pinning down the large-x gluon with NNLO top-quark pair differential distributions Article Swipe
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· 2017
· Open Access
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· DOI: https://doi.org/10.1007/jhep04(2017)044
· OA: W2559391104
Top-quark pair production at the LHC is directly sensitive to the gluon PDF\nat large x. While total cross-section data is already included in several PDF\ndeterminations, differential distributions are not, because the corresponding\nNNLO calculations have become available only recently. In this work we study\nthe impact on the large-x gluon of top-quark pair differential distributions\nmeasured by ATLAS and CMS at $\\sqrt{s}=8$ TeV. Our analysis, performed in the\nNNPDF3.0 framework at NNLO accuracy, allows us to identify the optimal\ncombination of LHC top-quark pair measurements that maximize the constraints on\nthe gluon, as well as to assess the compatibility between ATLAS and CMS data.\nWe find that differential distributions from top-quark pair production provide\nsignificant constraints on the large-x gluon, comparable to those obtained from\ninclusive jet production data, and thus should become an important ingredient\nfor the next generation of global PDF fits.\n
