Abstract
This article presents a new set of proton parton distribution functions, ATLASepWZVjet20, produced in an analysis at next-to-next-to-leading order in QCD. The new data sets considered are the measurements of W+ and W− boson and Z boson production in association with jets in pp collisions at sqrt{s} = 8 TeV performed by the ATLAS experiment at the LHC with integrated luminosities of 20.2 fb−1 and 19.9 fb−1, respectively. The analysis also considers the ATLAS measurements of differential W± and Z boson production at sqrt{s} = 7 TeV with an integrated luminosity of 4.6 fb−1 and deep-inelastic-scattering data from e±p collisions at the HERA accelerator. An improved determination of the sea-quark densities at high Bjorken x is shown, while confirming a strange-quark density similar in size to the up- and down-sea-quark densities in the range x ≲ 0.02 found by previous ATLAS analyses.
Highlights
Association with jets in pp collisions at s = 8 TeV performed by the ATLAS experiment at the LHC with integrated luminosities of 20.2 fb−1 and 19.9 fb−1, respectively
The analysis considers the ATLAS measurements of differential W ± and Z boson production at with an integrated luminosity of
The heavy-quark masses are set to their pole masses as determined by a combined analysis of HERA data on inclusive and heavy-flavour DIS processes [1, 42], mc = 1.43 GeV and mb = 4.5 GeV, and the strong coupling constant is fixed to αS(mZ) = 0.118
Summary
4.6 fb−1 and deep-inelastic-scattering data from e±p collisions at the HERA accelerator. Precision measurements from the ATLAS detector at the LHC, together with data from the HERA experiments, have been interpreted previously in a next-to-next-to-leading-order (NNLO) QCD analysis, resulting in the ATLASepWZ16 PDF set [12]. The finding of an unsuppressed strange PDF in this kinematic region is supported by the ATLAS measurement of W boson production in association with a charm quark (W + c) at. Data on the production of a vector boson in association with jets at the LHC provides a novel source of input to PDF determination that is sensitive to partons at higher x and Q2 than can be accessed by W and Z boson data alone, thereby yielding a data set complementary to the inclusive W, Z boson measurements [16].
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