1,721,068 research outputs found
Anomalous tqV couplings and FCNC top quark production.
Full text linkWe discuss FCNC top quark production via anomalous tqV couplings at the
Tevatron and HERA colliders. We calculate higher-order soft-gluon corrections to
such processes and demonstrate the stabilization of the cross section when these
corrections are included
Interview with Nikolaos Kidonakis
No full textDr. Kidonakis is a professor of Physics in the Department of Physics at Kennesaw State University. He was the recipient of the KSU Foundation Distinguished Scholarship Award in 2008 and the KSU Foundation Distinguished Research and Creative Activity Award in 2014.
The transcript includes two separate interviews: September 4, 2008, and August 22, 2014, both conducted by Thomas Allan Scott. It supersedes the single transcript for the September 4, 2008, interview
Single-top and top-antitop cross sections
Full text linkI present high-order calculations, including soft-gluon corrections, for
single-top and top-antitop production cross sections and differential
distributions. For single-top production, results are presented for the three
different channels in the Standard Model, for associated production with a
charged Higgs, and for processes involving anomalous couplings. For top-antitop
pair production, total cross sections and top-quark transverse-momentum and
rapidity distributions are presented for various LHC energies.Comment: 7 pages, 6 figures; presented at QCD@Work 2018, Matera, Italy, June
25-28, 201
High-order Threshold Corrections for Top-pair and Single-top Production
Full text linkI present results for high-order corrections from threshold resummation to cross sections and differential distributions in top-antitop pair production and in single-top production. I show aN3LO results for the total tt¯ cross section as well as for the top-quark transverse momentum (pT) and rapidity distributions, and the top-quark forward-backward asymmetry in tt¯production. I compare with the most recent Tevatron and LHC data, including at 13 TeV. I also present aNNLO results for cross sections and pT distributions in t-channel, s-channel, and tW-channel single-top production
Four-loop massive cusp anomalous dimension in QCD: a calculation from asymptotics
Full text linkI present a general method for determining the massive cusp anomalous
dimension in QCD to a very high degree of accuracy using its asymptotic
behavior at small and large quark velocities. I show that the method works
exceedingly well at two and three loops where exact results are already known.
I then present a calculation of the massive cusp anomalous dimension using its
asymptotics at four loops, and I provide a detailed study of the results for
different values of the number of flavors and for separate color structures.
The method can be further extended and applied to higher numbers of loops.Comment: 21 pages, 7 figures; v2 has additional study of color structure
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Top Quark Cross Sections and Differential Distributions
Full text linkI 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
Higher-order radiative corrections for b ¯b → H−W+
No full textI present higher-order radiative corrections from collinear and soft gluon emission for the associated production of a charged Higgs boson with a W boson. The calculation uses expressions from resummation at next-to-leading-logarithm accuracy. From the resummed cross section I derive approximate next-to-next-to-leading order (aNNLO) cross sections for the process b ¯b → H−W+ at LHC energies. The transverse-momentum and rapidity distributions of the charged Higgs boson are also calculated at aNNLO
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