Nikolaos Kidonakis

Kennesaw State University, Georgia, United States

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Publications (100)105.58 Total impact

  • Nikolaos Kidonakis, Richard J. Gonsalves
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    ABSTRACT: We present results for the $Z$-boson and $W$-boson transverse momentum ($p_T$) distributions for large $p_T$ at LHC and Tevatron energies. We calculate complete next-to-leading-order (NLO) QCD corrections as well as soft-gluon corrections at next-to-next-to-leading-order (NNLO) to the differential cross section. The NNLO soft-gluon contributions are derived from next-to-next-to-leading-logarithm (NNLL) resummation at two loops. We find enhancements of the $p_T$ distributions and reductions of the scale dependence when the NNLO corrections are included.
    Physical Review D 04/2014; 89(9). · 4.69 Impact Factor
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    11/2013;
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    Nikolaos Kidonakis
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    ABSTRACT: I discuss top quark production in hadronic collisions. I present the soft-gluon resummation formalism and its derivation from factorization and renormalization-group evolution, and two-loop calculations of soft anomalous dimensions in the eikonal approximation. I discuss the contributions of next-to-next-to-leading order (NNLO) soft-gluon corrections to the total cross sections and top-quark transverse momentum and rapidity distributions for top-antitop pair production, and for single-top production in the $t$ and $s$ channels and in association with a $W$ boson or a charged Higgs boson.
    11/2013;
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    Nikolaos Kidonakis
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    ABSTRACT: I present NNLO approximate calculations, based on NNLL resummation, for top quark differential transverse momentum and rapidity distributions. In particular recent results are presented for top-pair production and single-top production processes and compared to the latest experimental data from the LHC.
    10/2013;
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    Nikolaos Kidonakis
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    ABSTRACT: I discuss the effectiveness of soft-gluon resummations in describing higher-order corrections. I present a comparison of recent resummation approaches and their relative successes in approximating complete NNLO corrections. I also discuss fixed-order expansions through NNNLO and present some recent applications to QCD hard-scattering processes, including top-antitop pair production, single-top production, and W production at large transverse momentum.
    09/2013;
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    Nikolaos Kidonakis
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    ABSTRACT: I present approximate next-to-next-to-leading-order (NNLO) top-quark transverse momentum, pT, distributions in t-channel single-top production. These distributions are derived from next-to-next-to-leading-logarithm (NNLL) soft-gluon resummation. Theoretical results for the single top as well as the single antitop pT distributions are shown for LHC and Tevatron energies.
    Physical review D: Particles and fields 06/2013; 88(3).
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    Nikolaos Kidonakis
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    ABSTRACT: I discuss and compare several approaches to higher-order calculations of top quark production. I study the relative effectiveness of the approaches in approximating the exact NNLO results for the top-pair total cross section and highlight the theoretical and numerical differences between them. I show that the results from my soft-gluon resummation method are nearly identical to the exact NNLO cross section at all LHC and Tevatron energies. This agreement has important consequences for the validity of existing approximate NNLO differential distributions, for further refinements of the predictions, and for applications to other processes such as single-top production. I also compare approximate NNLO top quark transverse momentum and rapidity distributions with recent LHC measurements.
    04/2013;
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    B. Auerbach, S. V. Chekanov, N. Kidonakis
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    ABSTRACT: Studies of highly-boosted top quarks produced inclusively in pp collisions at 14 TeV are discussed. The hadronic decays of boosted top quarks was studied in a data-driven approach by analysing shapes of jet-mass distributions. Using Monte Carlo models after a fast detector simulation, it is shown that inclusive production of boosted top quarks can be observed if it has a cross section at least twice larger than the prediction from the approximate next-to-next-to-leading-order (aNNLO) calculation for the ttbar process. The ttbar process with the nominal aNNLO strength can be measured using the masses of jets after a b-tagging.
    01/2013;
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    Nikolaos Kidonakis
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    ABSTRACT: I present results for single-top and top-pair production at the LHC and the Tevatron. Higher-order two-loop corrections are used to achieve NNLL resummation, which is then used to derive NNLO soft-gluon corrections. Results are presented for total cross sections, top transverse momentum distributions, and top rapidity distributions. All results are in excellent agreement with data from the LHC and the Tevatron. I also clarify the differences between various methods in top-pair production and their relation to exact NNLO results.
    12/2012;
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    Nikolaos Kidonakis, Richard J. Gonsalves
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    ABSTRACT: We present new results for W-boson production at large transverse momentum at the LHC and the Tevatron. The contribution of soft-gluon corrections is derived from NNLL resummation and added to the exact NLO result. Numerical results and their uncertainties for the approximate NNLO W-boson transverse momentum distributions are derived and compared to recent data from the LHC.
    12/2012;
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    Nikolaos Kidonakis
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    ABSTRACT: I discuss threshold resummation at NNLL accuracy in the standard moment-space approach in perturbative QCD for top-pair and single-top production. For top quark pair production I present new approximate NNLO results for the total cross section and for the top quark transverse momentum and rapidity distributions at 8 TeV LHC energy. I discuss the accuracy of the soft-gluon approximation and show that the NLO and NNLO approximate results from resummation are practically indistinguishable from exact NLO and partial NNLO results. For single top production I present new approximate NNLO results for the total cross sections in all three channels at the LHC and also for the top quark transverse momentum distributions in t-channel production and in top-quark associated production with a W boson. For both ttbar and single-top production the agreement of theoretical results with LHC and Tevatron data is excellent.
    Physics of Particles and Nuclei 10/2012; · 0.67 Impact Factor
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    Nikolaos Kidonakis
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    ABSTRACT: I present theoretical results at approximate NNLO from NNLL resummation for top quark production at the LHC and the Tevatron, including new results at 8 TeV LHC energy. Total cross sections are shown for t tbar production, for single top production in the t and s channels and via associated tW production, and for associated tH- production. Top quark transverse momentum and rapidity distributions in t tbar production are also presented, as well as new results for t-channel single top and single antitop pT distributions.
    05/2012;
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    Nikolaos Kidonakis, Richard J. Gonsalves
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    ABSTRACT: We present results for W-boson production at large transverse momentum at LHC and Tevatron energies. We calculate complete next-to-leading-order (NLO) QCD corrections and higher-order soft-gluon corrections to the differential cross section. The soft-gluon contributions are resummed at next-to-next-to-leading-logarithm (NNLL) accuracy via the two-loop soft anomalous dimensions. Both NLO and approximate next-to-next-to-leading-order (NNLO) p_T distributions are presented. Our numerical results are in good agreement with recent data from the LHC.
    Physical review D: Particles and fields 01/2012; 87(1).
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    Nikolaos Kidonakis
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    ABSTRACT: I present theoretical results for the top quark pair total cross section, and for the top quark transverse momentum and rapidity distributions at Tevatron and LHC energies. I also present results for single top quark production in the t- and s-channels and also via associated production with a W boson. The calculations include approximate NNLO corrections that are derived from NNLL soft-gluon resummation.
    09/2011;
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    Nikolaos Kidonakis, Richard J. Gonsalves
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    ABSTRACT: We present new results for the complete two-loop corrections in the soft approximation for W and Z boson production at large transverse momentum. Analytical expressions for the NNLO approximate corrections are used to calculate transverse momentum distributions. Results for the W boson pT distribution at Tevatron and LHC energies are presented.
    09/2011;
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    Nikolaos Kidonakis
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    ABSTRACT: I present generalized formulas for approximate corrections to QCD hard-scattering cross sections through second order in the perturbative expansion. The approximate results are based on recent two-loop calculations for soft and collinear emission near threshold and are illustrated by several applications to strong-interaction processes in hadron colliders.
    09/2011;
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    Nikolaos Kidonakis, Ben D. Pecjak
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    ABSTRACT: We review theoretical calculations for top-quark production that include complete next-to-leading-order QCD corrections as well as higher-order soft-gluon corrections from threshold resummation. We discuss in detail the differences between various approaches that have appeared in the literature and review results for top-quark total cross sections and differential distributions at the Tevatron and the LHC.
    European Physical Journal C 08/2011; 72(7). · 5.25 Impact Factor
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    Nikolaos Kidonakis
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    ABSTRACT: I present results for the top quark rapidity distribution at LHC and Tevatron energies, including higher-order corrections from threshold resummation. The next-to-next-to-leading-order (NNLO) soft-gluon corrections at next-to-next-to-leading-logarithm (NNLL) level are added to the NLO result. Theoretical predictions are shown for the rapidity distribution, including the scale dependence of the distributions. The forward-backward asymmetry at the Tevatron is also calculated.
    Physical review D: Particles and fields 05/2011; 84.
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    Nikolaos Kidonakis
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    ABSTRACT: I discuss collinear and infrared divergences in QCD cross sections with massless and massive final-state particles. I present the two-loop renormalization group evolution and resummation in terms of anomalous dimensions, and I show specific results for a variety of QCD hard-scattering processes.
    05/2011;
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    Nikolaos Kidonakis
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    ABSTRACT: I present results for the top quark pair total cross section and the top quark transverse momentum distribution at Tevatron and LHC energies. I also present results for single top quark production. All calculations include NNLO corrections from NNLL threshold resummation.
    05/2011;

Publication Stats

2k Citations
105.58 Total Impact Points

Institutions

  • 2005–2013
    • Kennesaw State University
      Georgia, United States
  • 2004
    • University of California, Davis
      Davis, California, United States
  • 2002–2004
    • University of Cambridge
      • Department of Physics: Cavendish Laboratory
      Cambridge, ENG, United Kingdom
  • 2003
    • Southern Methodist University
      Dallas, Texas, United States
    • University of Rochester
      • Department of Physics and Astronomy
      Rochester, New York, United States
    • Cambridge Eco
      Cambridge, England, United Kingdom
  • 1999–2002
    • Florida State University
      • Department of Physics
      Tallahassee, FL, United States
  • 2000
    • CERN
      Genève, Geneva, Switzerland
  • 1996–1998
    • The University of Edinburgh
      • School of Physics and Astronomy
      Edinburgh, SCT, United Kingdom
  • 1995
    • Stony Brook University
      Stony Brook, New York, United States