scholarly journals Tevatron Combination of Single-Top-Quark Cross Sections and Determination of the Magnitude of the Cabibbo-Kobayashi-Maskawa Matrix ElementVtb

2015 ◽  
Vol 115 (15) ◽  
Author(s):  
T. Aaltonen ◽  
V. M. Abazov ◽  
B. Abbott ◽  
B. S. Acharya ◽  
M. Adams ◽  
...  
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
Single Top

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.

Production of techni-dilaton associated with a top quark at the LHC

2014 ◽  
Vol 29 (16) ◽  
pp. 1450066
Author(s):  
You Yu ◽  
Chong-Xing Yue ◽  
Qing-Guo Zeng ◽  
Shuo Yang
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Scalar Particle ◽  
Mass Range ◽  
Single Top ◽  
Energy Formula ◽  
The One ◽  
Higgs Data

One kind of walking technicolor (WTC) theories predict the existence of a new scalar particle called techni-dilaton (TD) which can explain the current Higgs data at the CERN Large Hadron Collider (LHC). We calculate the cross-sections for the production of the TD in association with single top quark (tϕj production) in the framework of the one-family model (1FM) at the LHC. Our numerical results show that their values are at the level of several tens fb over the mass range 100 GeV < Mϕ < 600 GeV with the center-of-mass (c.m.) energy [Formula: see text]. We further analyze the signal induced by the tϕj production and the relevant Standard Model (SM) backgrounds.

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 NLO QCD+EW predictions for tHj and tZj production at the LHC

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Davide Pagani ◽  
Ioannis Tsinikos ◽  
Eleni Vryonidou
Keyword(s):  
Cross Sections ◽  
Top Quark ◽  
Parton Shower ◽  
Specific Production ◽  
Final State ◽  
Realistic Estimate ◽  
Single Top ◽  
The Cross ◽  
Theory Uncertainty ◽  
Production Channel

Abstract In this work we calculate the cross sections for the hadroproduction of a single top quark or antiquark in association with a Higgs (tHj) or Z boson (tZj) at NLO QCD+EW accuracy. In the case of tZj production we consider both the case of the Z boson undecayed and the complete final state tℓ+ℓ−j, including off-shell and non-resonant effects. We perform our calculation in the five-flavour-scheme (5FS), without selecting any specific production channel (s-, t- or tW associated). Moreover, we provide a more realistic estimate of the theory uncertainty by carefully including the differences between the four-flavour-scheme (4FS) and 5FS predictions. The difficulties underlying this procedure in the presence of EW corrections are discussed in detail. We find that NLO EW corrections are in general within the NLO QCD theory uncertainties only if the flavour scheme uncertainty (4FS vs. 5FS) is taken into account. For the case of tℓ+ℓ−j production we also investigate differences between NLO QCD+EW predictions and NLO QCD predictions matched with a parton shower simulation including multiple photon emissions.

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