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 Total and Differential Cross Sections for Higgs and Top-Quark Production

Universe ◽  
2018 ◽  
Vol 4 (11) ◽  
pp. 121 ◽  
Author(s):  
Nikolaos Kidonakis
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
Top Quark ◽  
W Boson ◽  
Theoretical Calculations ◽  
Total Cross Sections ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production ◽  
Rapidity Distributions

I present theoretical calculations for Higgs-boson and top-quark production, including high-order soft-gluon corrections. I discuss charged-Higgs production in association with a top quark or a W boson, as well as single-top and top-antitop production. Total cross sections as well as transverse-momentum and rapidity distributions of the top quark or the Higgs boson are presented for various LHC energies.

scholarly journals Probing anomalous off-shell electroweak dipole moment of the top quark in single top quark production associated with Z or W bosons

2019 ◽  
Vol 222 ◽  
pp. 04009
Author(s):  
Edward Boos ◽  
Vyacheslav Bunichev ◽  
Lev Dudko ◽  
Georgii Vorotnikov
Keyword(s):  
Dipole Moment ◽  
Top Quark ◽  
Covariant Derivative ◽  
W Boson ◽  
Z Bosons ◽  
W Bosons ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

An extension of the previous studies of anomalous Wtb interaction with offshell W boson was considered in associated single top quark production with W or Z bosons. More general variant with covariant derivative DµW−µ b−(fLWPL + fRWPR)t for the same processes is considered in this paper.

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 Bounds on the Electromagnetic Dipole Moments through the Single Top Production at the CLIC

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
M. Köksal ◽  
A. A. Billur ◽  
A. Gutiérrez-Rodríguez
Keyword(s):  
Top Quark ◽  
Dipole Moments ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Center Of Mass Energy ◽  
Systematic Uncertainties ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production

We obtain bounds on the anomalous magnetic and electric dipole moments of thet-quark from a future high-energy and high-luminosity linear electron positron collider, as the CLIC, with polarized and unpolarized electron beams which are powerful tools for determining new physics. We consider the processesγe-→t¯bνe(γis the Compton backscattering photon) ande+e-→e-γ⁎e+→t¯bνee+(γ⁎is the Weizsacker-Williams photon) as they are one of the most important sources of single top quark production. For systematic uncertainties ofδsys=0%  (5%),b-tagging  efficiency=0.8, center-of-mass energy ofs=3 TeV, and integrated luminosity ofL=2ab-1the futuree+e-collider may put bounds on the electromagnetic dipole momentsa^Vanda^Aof the top quark of the order ofO(10-2–10-1)at the2σ  (3σ)level, which are competitive with those recently reported in previous studies at hadron colliders and the ILC.

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.

Sign in / Sign up

Export Citation Format

Share Document