Topic
Parton
About: Parton is a research topic. Over the lifetime, 13484 publications have been published within this topic receiving 368877 citations.
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TL;DR: In this article, a combination of the inclusive deep inelastic cross sections measured by the H1 and ZEUS Collaborations in neutral and charged current unpolarised e(+/-)p scattering at HERA during the period 1994-2000 is presented.
Abstract: A combination is presented of the inclusive deep inelastic cross sections measured by the H1 and ZEUS Collaborations in neutral and charged current unpolarised e(+/-)p scattering at HERA during the period 1994-2000. The data span six orders of magnitude in negative four-momentum-transfer squared, Q(2), and in Bjorken x. The combination method used takes the correlations of systematic uncertainties into account, resulting in an improved accuracy. The combined data are the sole input in a NLO QCD analysis which determines a new set of parton distributions, HERAPDF1.0, with small experimental uncertainties. This set includes an estimate of the model and parametrisation uncertainties of the fit result.
624 citations
TL;DR: In this paper, the authors compare different procedures for combining fixed-order tree-level matrix-element generators with parton showers and find that although similar results are obtained in all cases, there are important differences.
Abstract: We compare different procedures for combining fixed-order tree-level matrix-element generators with parton showers. We use the case of W-production at the Tevatron and the LHC to compare different implementations of the so-called CKKW and MLM schemes using different matrix-element generators and different parton cascades. We find that although similar results are obtained in all cases, there are important differences.
619 citations
TL;DR: In this article, the authors presented the resummation of collinear and soft-gluon corrections to single top quark production in the $t$ channel at next-to-next to-leading logarithm accuracy using two-loop soft anomalous dimensions.
Abstract: I present the resummation of collinear and soft-gluon corrections to single top quark production in the $t$ channel at next-to-next-to-leading logarithm accuracy using two-loop soft anomalous dimensions. The expansion of the resummed cross section yields approximate next-to-next-to-leading-order cross sections. Numerical results for $t$-channel single top quark (or single antitop) production at the Tevatron and the LHC are presented, including the dependence of the cross sections on the top quark mass and the uncertainties from scale variation and parton distributions. Combined results for all single top quark production channels are also given.
617 citations
TL;DR: In this article, the general form of the angular distribution of lepton pairs produced in hadron collisions is given, where each dilepton is assumed to come from the decay of a virtual photon, and the Drell-Yan model extended to include parton transverse momentum with on-shell quarks is then used to calculate the three coefficients in the distribution.
Abstract: We give the general form of the angular distribution of lepton pairs produced in hadron collisions, where each dilepton is assumed to come from the decay of a virtual photon. The Drell-Yan model extended to include parton transverse momentum (with on-shell quarks) is then used to calculate the three coefficients in the distribution.
610 citations
TL;DR: In this article, the authors review the physics basis, main features and use of general-purpose Monte Carlo event generators for the simulation of proton-proton collisions at the Large Hadron Collider.
608 citations