scholarly journals Single top quark production as a window to physics beyond the standard model

2000 ◽  
Vol 63 (1) ◽  
Author(s):  
Tim M. P. Tait ◽  
C.-P. Yuan
Keyword(s):  
Standard Model ◽  
Top Quark ◽  
Beyond The Standard Model ◽  
Single Top ◽  
The Standard Model ◽  
Top Quark Production ◽  
Quark Production

scholarly journals Single-Top Quark Production at CMS

Universe ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 19
Author(s):  
Priyanka ◽  
Kirti Ranjan ◽  
Ashutosh Bhardwaj
Keyword(s):  
Standard Model ◽  
Top Quark ◽  
Standard Model Prediction ◽  
Beyond The Standard Model ◽  
Channel Measurements ◽  
Single Top ◽  
The Standard Model ◽  
Top Quark Production ◽  
Quark Production ◽  
Using Data

An overview of recent results of single-top quark production at the LHC using data collected with the CMS detector is presented. The CMS experiment has measured the electroweak production of the top quark in three production modes, namely t-channel, tW-channel, and s-channel. Measurements of the rare processes involving a single-top quark with a Z boson and a single-top quark with a γ are also discussed. All measurements are in agreement with the standard model prediction, and no sign of physics beyond the standard model is observed.

scholarly journals Top quark measurements in the CMS experiment

2018 ◽  
Vol 182 ◽  
pp. 02074
Author(s):  
Luca Lista
Keyword(s):  
Standard Model ◽  
Cross Sections ◽  
Top Quark ◽  
Model Parameters ◽  
Beyond The Standard Model ◽  
Cms Experiment ◽  
Single Top ◽  
Theoretical Predictions ◽  
Top Quark Production ◽  
Quark Production

Experimental results on top-quark physics obtained at the CMS experiment are reported based on the data recorded at centre-of-mass energy up to 13 TeV. Inclusive and differential cross sections for both top-quark pair and single top-quark production are presented, as well as measurements of top-quark properties in production and decay, and searches for anomalous couplings. The presented measurements test theoretical predictions, including recent perturbative QCD calculations, provide constraints of fundamental standard model parameters, and set limits on physics beyond the standard model.

scholarly journals Modeling of anomalousWtbinteractions in single top quark events using subsidiary fields

2017 ◽  
Vol 32 (02n03) ◽  
pp. 1750008 ◽  
Author(s):  
E. Boos ◽  
V. Bunichev ◽  
L. Dudko ◽  
M. Perfilov
Keyword(s):  
Top Quark ◽  
Vector Fields ◽  
Matrix Elements ◽  
Minimal Set ◽  
Anomalous Couplings ◽  
Single Top ◽  
The Standard Model ◽  
Top Quark Production ◽  
Quark Production ◽  
Production Mechanisms

A method to simulate anomalous fermion–boson interactions in Wtb vertex is presented with a minimal set of simulated samples of single top quark events at the LHC energies. In the proposed method, additional subsidiary vector fields corresponding to the Standard Model gauge fields are implemented for each type of the anomalous vertex structure. The method allows to simulate a manifestation of anomalous gauge couplings in two approaches used in experimental analyses either keeping only the linear order contributions in the anomalous couplings or keeping all contributions in numerators and denominators as appeared in matrix elements. For the processes with several anomalous couplings contributing simultaneously to the production and to the decay as well as to various interference terms the method allows to model correctly the dependence of kinematic distributions on anomalous couplings. The method shows how to generate a minimum set of event samples needed for a concrete analysis. All the single top quark production mechanisms, t-, s- and associative tW-channels, are considered. The correctness of the proposed method is demonstrated.

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 RECENT STUDIES OF TOP QUARK PROPERTIES AND DECAYS AT HADRON COLLIDERS

2012 ◽  
Vol 27 (33) ◽  
pp. 1230036 ◽  
Author(s):  
V. CHIOCHIA
Keyword(s):  
Elementary Particle ◽  
Standard Model ◽  
Top Quark ◽  
New Physics ◽  
Hadron Colliders ◽  
Statistical Precision ◽  
The Standard Model ◽  
Top Quark Production ◽  
Quark Production ◽  
First Time

The top quark is the heaviest known elementary particle. Observed for the first time in 1995 at the Tevatron by the CDF and D0 experiments, it has become object of several studies aimed to fully characterize its properties and decays. Precise determinations of top quark characteristics verify the internal consistency of the Standard Model (SM) and are sensitive to new physics phenomena. With the advent of the large top quark production rates generated at the LHC, top quark studies have reached unprecedented statistical precision. This review summarizes the recent measurements of top quark properties and studies of its decays performed at the LHC and Tevatron.

scholarly journals OBSERVATION OF SINGLE TOP QUARK PRODUCTION AT THE TEVATRON COLLIDER

2010 ◽  
Vol 25 (05) ◽  
pp. 309-339 ◽  
Author(s):  
A. P. HEINSON
Keyword(s):  
Top Quark ◽  
Standard Model Prediction ◽  
Physical Review ◽  
Tevatron Collider ◽  
Single Top ◽  
The Standard Model ◽  
Top Quark Production ◽  
Quark Production ◽  
Mixing Matrix ◽  
Cross Section Formula

On March 4, 2009, the DØ and CDF collaborations at Fermilab's Tevatron Collider submitted papers to Physical Review Letters announcing observation of single top quark production.1,2 This review paper describes the successful searches carried out independently by the two collaborations, allowing the reader to see the similarities and differences that led to the simultaneous discoveries. Both collaborations measured a cross section [Formula: see text] consistent with the standard model prediction at 5.0 standard deviation significance, and set a lower limit on the quark mixing matrix element |Vtb| without assuming matrix unitarity with three quark generations.

scholarly journals Search for Single Top Production with CDF

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 382-385 ◽  
Author(s):  
◽  
T. Kikuchi ◽  
S. K. Wolinski ◽  
L. Demortier ◽  
S. Kim ◽  
...  
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Standard Model Prediction ◽  
Gluon Fusion ◽  
Upper Limit ◽  
Single Top ◽  
Upper Limits ◽  
The Standard Model ◽  
Top Quark Production ◽  
Quark Production

We search for Standrod Model single-top-quark production in the W -gluon fusion and W* channels using 106 pb-1 of data from [Formula: see text] collisions at [Formula: see text] collected with the Collider Detector at Fermilab. We set an upper limit at 95% C.L. on the combined Wg + W* single-top cross section of 13.5 pb, roughly five-and-a-half times larger larer than the standard model prediction. Separate 95% C.L. upper limits in the Wg-fusion and W* channels ae also determined and are found to be 13.5 and 12.9 pb respectively.

scholarly journals TOP QUARK PHYSICS

2008 ◽  
Vol 23 (27n28) ◽  
pp. 4421-4433 ◽  
Author(s):  
◽  
ERICH W. VARNES
Keyword(s):  
Top Quark ◽  
Production Cross ◽  
New Physics ◽  
Recent Measurement ◽  
Top Quark Mass ◽  
Text Production ◽  
Single Top ◽  
The Standard Model ◽  
Top Quark Production ◽  
Quark Production

A review is presented of the current experimental status of the top quark sector of the Standard Model. The measurements summarized include searches for electroweak single top production, the latest results on the [Formula: see text] production cross-section, and searches for new physics in top quark production and decay. In addition, the recent measurement of the top quark mass to a precision of 0.7% is highlighted.

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