scholarly journals Differences in fully differential cross section of single top quark production and its subsequent decay process depending on various anomalous Wtb couplings.

2019 ◽  
Vol 222 ◽  
pp. 04007
Author(s):  
Edward Boos ◽  
Viacheslav Bunichev
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Top Quark ◽  
Fully Differential ◽  
Subsequent Decay ◽  
Single Top ◽  
Quark Spin ◽  
Top Quark Production ◽  
Quark Production ◽  
Fully Differential Cross Section

The fully differential cross sections of t-channel production of a single top quark with its subsequent decay are compared for the case of contributions involving anomalous Wtb couplings. It is shown that the most noticeable differences, for cases corresponding to different anomalous couplings, appear in the shape of two-dimensional distributions, where one of the variables is the energy of a charged lepton and the other is one of the t-quark spin orientation angles.

scholarly journals Soft-gluon corrections in top-quark production

2018 ◽  
Vol 33 (25) ◽  
pp. 1830021 ◽  
Author(s):  
Nikolaos Kidonakis
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
Z Bosons ◽  
New Physics ◽  
Higgs Bosons ◽  
Soft Gluon ◽  
Total Cross Sections ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

I review calculations of soft-gluon corrections for top-quark production in hadron collisions. I describe theoretical formalisms for their resummation and for finite-order expansions. I show that soft-gluon corrections are dominant for a large number of top-quark processes. I discuss top–antitop pair production as well as single-top production, including total cross sections and differential distributions, and compare with data from the LHC and the Tevatron. I also discuss top-quark production in association with charged Higgs bosons, Z bosons and other particles in models of new physics.

scholarly journals Single-top-quark production in the t-channel at NNLO

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
John Campbell ◽  
Tobias Neumann ◽  
Zack Sullivan
Keyword(s):  
Standard Model ◽  
Cross Sections ◽  
Top Quark ◽  
Light Quark ◽  
Inclusive Cross Section ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production ◽  
Jet Cross Sections ◽  
Quark Line

Abstract We present a calculation of t-channel single-top-quark production and decay in the five-flavor scheme at NNLO. Our results resolve a disagreement between two previous calculations of this process that found a difference in the inclusive cross section at the level of the NNLO coefficient itself. We compare in detail with the previous calculations at the inclusive, differential and fiducial level including b-quark tagging at a fixed scale μ = mt. In addition, we advocate the use of double deep inelastic scattering (DDIS) scales (μ2 = Q2 for the light-quark line and μ2 = Q2 + $$ {m}_t^2 $$ m t 2 for the heavy-quark line) that maximize perturbative stability and allow for robust scale uncertainties. All NNLO and NLO⊗NLO contributions for production and decay are included in the on-shell and vertex-function approximation. We present fiducial and differential results for a variety of observables used in Standard Model and Beyond Standard Model analyses, and find an important difference between the NLO and NNLO predictions of exclusive t + n-jet cross sections. Overall we find that NNLO corrections are crucial for a precise identification of the t-channel process.

scholarly journals Measurements of single top quark production cross sections and|Vtb|inpp¯collisions ats=1.96  TeV

2011 ◽  
Vol 84 (11) ◽  
Author(s):  
V. M. Abazov ◽  
B. Abbott ◽  
B. S. Acharya ◽  
M. Adams ◽  
T. Adams ◽  
...  
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
Production Cross ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

scholarly journals Top cross-sections and single top

2014 ◽  
Vol 31 ◽  
pp. 1460277 ◽  
Author(s):  
Reinhard Schwienhorst ◽  
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Cross Sections ◽  
Top Quark ◽  
Production Cross ◽  
Decay Modes ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

This paper summarizes top quark cross-section measurements at the Tevatron and the LHC. Top quark pair production cross-sections have been measured in all decay modes by the ATLAS and CMS collaborations at the LHC and by the CDF and D0 collaborations at the Tevatron. Single top quark production has been observed at both the Tevatron and the LHC. The t-channel and associated Wt production modes have been observed at the LHC and evidence for s-channel production has been reported by the Tevatron collaborations.

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