660 research outputs found

    QCD

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    In these lecture notes I describe the theory of QCD and its application, through perturbation theory, at particle colliders.Comment: 58 pages, contribution to the Proceedings of the 2014 European School of High-Energy Physics. Garderen, the Netherlands, 18 June - 1 July 201

    Radiative corrections to eγe \gamma scattering

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    We investigate the effects of photon radiation on deep-inelastic \re\gamma scattering. Depending on the set of variables chosen, we find appreciable effects in the kinematic region accessible at LEP2. Convenient analytic results for O(α)O(\alpha) corrected differential cross sections are presented.Comment: 9 pages, latex + 1 postscript figure, all uuencode

    Charm Production in Deep-Inelastic eγe\gamma Scattering To Next-To-Leading Order in QCD

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    We discuss the calculation of F2γ(charm)F_2^{\gamma}({\rm charm}) to next-to-leading order (NLO) in QCD, including contributions from both hadronlike and pointlike photons. We show that the former dominates strongly below x0.01x\simeq 0.01, and the latter above this value. This fact makes F2γ(charm)F_2^{\gamma}({\rm charm}) for x0.01x \geq 0.01 calculable, whereas for x0.01x \leq 0.01 it serves to constrain the small-xx gluon density in the photon. Both ranges in xx are accessible at LEP2. Theoretical uncertainties are well under control. We present rates for single-tag events for the process for e+ee+ecXe^+e^- \rightarrow e^+e^- c X for LEP2. Although these event rates are small, we believe a measurement of F2γ(charm)F_2^{\gamma}({\rm charm}) is feasible.Comment: 7 pages Latex, with 2 eps figs., uuencode

    Model-independent QED corrections to photon structure-function measurements

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    We present the first calculation of QED radiative corrections to deep-inelastic electron-photon scattering in terms of those variables that are reconstructed in measurements of the photon structure function in electron-positron collisions. In order to cover the low-Q2Q^2 region, we do not invoke the QCD-improved parton model but rather express our results in terms of the photon structure functions. Both analytical and numerical results are given.Comment: Latex, 8 pages, 3 figures, uses epsfig.sty, 12pt.st

    W Plus Heavy Quark Production at the Tevatron

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    We summarize the motivations for and the status of the calculation of the W+W + heavy quark production process in ppˉp \bar p colliders to Next-to-Leading Order in QCD. This process can be used to constrain the strange quark distribution function at high Q2Q^2 at the Tevatron, and also to study the bottom content of W+1W+1~jet events. In addition, when crossed, the calculation essentially describes the single top quark production process to Next-to-Leading Order in QCD.Comment: Presented by S. Keller at DPF94 Meeting, Albuquerque, New Mexico, August 1-6,1994. 4 pages, no macros, no figures. Fermilab-Conf-94/260-T, FSU--HEP--940817. A postscript file is available via anonymous ftp at hepsg1.physics.fsu.edu, file is /pub/keller/fsu-hep-940817.p

    Developments in QCD

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    Top quark theory

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    Top Quark Production Cross Section

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    The production rate for top quarks at the Fermilab Tevatron is presented using the exact order αs3\alpha_s^3 corrected cross section and the resummation of the leading soft gluon corrections in all orders of perturbation theory.Comment: preprint FERMILAB-Pub-93/270-T, ITP-SB-93-55, THU-93/23, Latex 9 pages, 8 postscript figures, uuencoded and appended at end of fil

    Top physics at the ILC and hadron colliders

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    I discuss a selection of recent developments in top quark physics relevant for either ILC or Tevatron/LHC, or both

    Heavy Quark Production in Deep-Inelastic Scattering at HERA

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    We discuss two topics in the production of heavy quarks in deep-inelastic scattering: the next-to-leading order Monte-Carlo HVQDIS and the next-to-leading logarithmic resummation of soft gluon effects, including estimates of next-to-next-to-leading order corrections therefrom.Comment: 10 pages, 10 figures, To appear in Proceedings of Monte Carlo Generators for HERA Physics, Hamburg 1998/99 Figures update
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