Nikolaos Kidonakis

Kennesaw State University, Кеннесо, Georgia, United States

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Publications (112)219.14 Total impact

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    Nikolaos Kidonakis
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    ABSTRACT: I present calculations of approximate corrections from NNLL soft-gluon resummation for total and differential cross sections in top-antitop pair production and single-top production in hadronic collisions. I show that soft-gluon corrections from partonic threshold are the dominant contribution to top-quark production and closely approximate exact results. I present aN$^3$LO results for the total $t{\bar t}$ cross section, the top-quark $p_T$ and rapidity distributions, and the top-quark forward-backward asymmetry. I also provide updates for single-top production in the $t$, $s$, and $tW$ channels. Finally, I discuss top-quark production via anomalous gluon couplings.
    Preview · Article · Sep 2015
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    Nikolaos Kidonakis
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    ABSTRACT: I present results from recent high-order calculations for the production of electroweak bosons and top quarks. In particular, I discuss $W$ and $Z$ boson production at large transverse momentum, single-top production, and FCNC top production. Theoretical predictions which include higher-order soft-gluon corrections are presented for total cross sections and differential distributions at the LHC.
    Preview · Article · Jun 2015
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    Nikolaos Kidonakis
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    ABSTRACT: I present a calculation of approximate N$^3$LO corrections from NNLL soft-gluon resummation for differential distributions in top-antitop pair production in hadronic collisions. Soft-gluon corrections are the dominant contribution to top-quark production and closely approximate exact results through NNLO. I show aN$^3$LO results for the total $t{\bar t}$ cross section, the top-quark $p_T$ and rapidity distributions, and the top-quark forward-backward asymmetry. The higher-order corrections are significant and they reduce theoretical uncertainties.
    Preview · Article · Jun 2015
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    Nikolaos Kidonakis
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    ABSTRACT: I calculate the top quark forward-backward asymmetry at the Tevatron in both the laboratory frame and the $t{\bar t}$ rest frame. I show that soft-gluon corrections are the dominant contribution to the asymmetry and closely approximate exact results through next-to-next-to-leading order (NNLO). I present a calculation of the next-to-next-to-next-to-leading-order (N$^3$LO) soft-gluon contribution to the asymmetry and include electroweak corrections as well. Thus approximate N$^3$LO (aN$^3$LO) results are obtained, which significantly enhance and improve previous NNLO results. The theoretical aN$^3$LO result for the top quark forward-backward asymmetry at the Tevatron in the laboratory frame is ($6.8 \pm 0.3$)%, and in the $t{\bar t}$ rest frame it is ($10.0 \pm 0.6$)% which is in excellent agreement with recent Tevatron data.
    Preview · Article · Jan 2015 · Physical Review D
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    Nikolaos Kidonakis
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    ABSTRACT: I present a calculation of next-to-next-to-next-to-leading-order (NNNLO) soft-gluon corrections for differential distributions in top-antitop pair production in hadronic collisions. Approximate NNNLO (aNNNLO) results are obtained from soft-gluon resummation. Theoretical predictions are shown for the top-quark aNNNLO transverse momentum ($p_T$) and rapidity distributions at LHC and Tevatron energies. The aNNNLO corrections enhance previous results for the distributions but have smaller theoretical uncertainties.
    Preview · Article · Nov 2014 · Physical Review D
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    Nikolaos Kidonakis
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    ABSTRACT: I present a calculation of next-to-next-to-next-to-leading-order (NNNLO) soft-gluon corrections for top-antitop pair production in hadronic collisions. Approximate NNNLO (aNNNLO) results are obtained by adding the NNNLO soft-gluon corrections to the complete next-to-next-to-leading-order (NNLO) cross section. Theoretical predictions are shown for the total aNNNLO $t{\bar t}$ cross section at LHC and Tevatron energies. The aNNNLO cross sections are larger but have smaller theoretical uncertainties than at NNLO.
    Preview · Article · May 2014 · Physical Review D
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    Nikolaos Kidonakis · Elwin Martin
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    ABSTRACT: We present a calculation of soft-gluon corrections in FCNC top-quark production via anomalous $t$-$q$-$g$ couplings. The soft anomalous dimension matrix is explicitly calculated at one-loop accuracy. This calculation allows threshold resummation at next-to-leading-logarithm accuracy. We also derive expressions for the soft-gluon corrections at NLO and at NNLO.
    Preview · Article · Apr 2014 · Physical Review D
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    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.
    Preview · Article · Apr 2014 · Physical Review D
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    Full-text · Article · Nov 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.
    Preview · Article · Nov 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.
    Preview · Article · Oct 2013
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    Nikolaos Kidonakis · Elwin Martin
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    ABSTRACT: We calculate flavor-changing neutral current (FCNC) processes with top-quark production via anomalous couplings at LHC energies. We report on progress on the FCNC processes gu -> tZ, gu -> t gamma and gu -> tg. We go beyond leading order and include soft-gluon corrections through next-to-next-to-leading order.
    Preview · Article · Oct 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.
    Preview · Article · Sep 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.
    Preview · Article · Jun 2013 · Physical review D: Particles and fields
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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.
    Preview · Article · Apr 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.
    Preview · Article · Jan 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.
    Preview · Article · Dec 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.
    Preview · Article · Dec 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.
    Preview · Article · Oct 2012 · Physics of Particles and Nuclei
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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.
    Preview · Article · May 2012

Publication Stats

4k Citations
219.14 Total Impact Points

Institutions

  • 2005-2015
    • Kennesaw State University
      Кеннесо, Georgia, United States
  • 2002-2004
    • University of Cambridge
      • Department of Physics: Cavendish Laboratory
      Cambridge, ENG, United Kingdom
  • 2003
    • University of Rochester
      • Department of Physics and Astronomy
      Rochester, New York, United States
    • Cambridge Eco
      Cambridge, England, United Kingdom
  • 1996-2001
    • Florida State University
      • Department of Physics
      Tallahassee, FL, United States
  • 1996-1998
    • The University of Edinburgh
      • School of Physics and Astronomy
      Edinburgh, Scotland, United Kingdom
  • 1995
    • Stony Brook University
      • Institute for Theoretical Physics (C.N. Yang)
      스토니브룩, New York, United States