Properties of the Top Quark

Déliot, F.; Hadley, N. J.; Parke, Stephen J.; Schwarz, T.

doi:10.1146/annurev-nucl-102313-025655

Cited by 10 publications

(8 citation statements)

References 94 publications

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“…Because it is so heavy, the t decays without hadronizing. Its production and decays are excellent probes of QCD, the electroweak theory, and V tb (Déliot et al, 2014;Kröninger et al, 2015;Boos et al, 2015, and Chapter 8). The top couples strongly to the Higgs in the standard model, and its mass is critical to the issue of vacuum stability and to the Higgs mass prediction in supersymmetry (Section 8.5).…”

Section: Heavy Quark and Lepton Decaysmentioning

confidence: 99%

The Standard Model and Beyond

Langacker¹

2017

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This eBook was converted to open access in 2021 through the sponsorship of SCOAP3 licensed under the terms of the creative commons Attribution-NonCommercial 4.0 International License (https://creativecommons.org/licenses/by-nc/4.0/) which permits use, sharing, adaptation distribution and reproduction in any medium or format, as long as you give appropriate credit to the author(s) and the source, provide a link to the creative commons license and indicate if changes were made, this license does not permit the Contribution to be used commercially. Contents Preface xiChapter 1 Notation and Conventions 1.1 PROBLEMS Chapter 2 Review of Perturbative Field Theory 2.1 CREATION AND ANNIHILATION OPERATORS 2.2 LAGRANGIAN FIELD THEORY 2.3 THE HERMITIAN SCALAR FIELD 2.3.1 The Lagrangian and Equations of Motion 2.3.2 The Free Hermitian Scalar Field 2.3.3 The Feynman Rules 2.3.4 Kinematics and the Mandelstam Variables 2.3.5 The Cross Section and Decay Rate Formulae 2.3.6 Loop Effects 2.4 THE COMPLEX SCALAR FIELD 2.4.1 U (1) Phase Symmetry and the Noether Theorem 2.5 ELECTROMAGNETIC AND VECTOR FIELDS 2.5.1 Massive Neutral Vector Field 2.6 ELECTROMAGNETIC INTERACTION OF CHARGED PIONS 2.7 THE DIRAC FIELD 2.7.1 The Free Dirac Field 2.7.2 Dirac Matrices and Spinors 2.8 QED FOR ELECTRONS AND POSITRONS 2.9 SPIN EFFECTS AND SPINOR CALCULATIONS 2.10 THE DISCRETE SYMMETRIES P , C, CP , T , AND CP T 2.11 TWO-COMPONENT NOTATION AND INDEPENDENT FIELDS 2.12 QUANTUM ELECTRODYNAMICS (QED) 2.12.1 Higher-Order Effects 2.12.2 The Running Coupling 2.12.3 Tests of QED 2.12.4 The Role of the Strong Interactions 2.13 OPERATOR DIMENSIONS AND CLASSIFICATION v vi Contents 2.14 MASS AND KINETIC MIXING 2.15 PROBLEMS Chapter 3 Lie Groups, Lie Algebras, and Symmetries 3.1 BASIC CONCEPTS 3.1.1 Groups and Representations 3.1.2 Examples of Lie Groups 3.1.3 More on Representations and Groups 3.2 GLOBAL SYMMETRIES IN FIELD THEORY 3.

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Section: Heavy Quark and Lepton Decaysmentioning

confidence: 99%

The Standard Model and Beyond

Langacker¹

2017

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“…Single top quark production and decay processes play a very important role, since they make it possible to measure the parameters of the Wtb vertex with high accuracy, as well as to study the polarization properties of the t-quark and its decay products. This allows you to find possible deviations from the predictions of the Standard Model [1][2][3][4][5][6]. If new physics exists on a large scale, then its contribution can be taken into account using operators of dimension six [7], which are invariant with respect to the gauge group of the Standard Model.…”

Section: Introductionmentioning

confidence: 99%

“…The couplings in the Lagrangian (1) are related in the following way to the corresponding Wilson coefficients: (3,33)…”

Section: Introductionmentioning

confidence: 99%

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

Boos

Bunichev

2019

EPJ Web Conf.

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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.

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“…In this respect, an intriguing aspect is that the top quark has a very short lifetime and its decay width satisfies Γ t G F m 3 t Λ 2 QCD /m t implying that it decays immediately, i.e., before hadronization effects can take place. Thus, all its fundamental properties can be probed by studying its decay products (for a review, see [3][4][5]). Consequent measurements are therefore well established and can be used to either test the SM predictions or look for new physics beyond it.…”

Section: Introductionmentioning

confidence: 99%

Top quark polarization as a probe of charged Higgs bosons

2018

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We study the production and decay of a heavy charged Higgs boson in the bg → tH − and H − → bt processes at the Large Hadron Collider (LHC). We show that the chiral structure of the H − tb vertex entering both stages is sensitive to the underlying Higgs mechanism of Electro-Weak Symmetry Breaking (EWSB) and we specifically demonstrate that one could distinguish between two popular realizations of a 2-Higgs Double Model (2HDM) embedding a new H ± state, i.e., those with Type-I and -Y Yukawa couplings. The chiral structure of such a vertex, which is different in the two cases, in turn triggers a particular spin state of the top quark which is then transmitted to its decay products. Hence, both inclusive rates and exclusive observables can be used to extract the presence of such a charged Higgs boson state in LHC data.

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Properties of the Top Quark

Cited by 10 publications

References 94 publications

The Standard Model and Beyond

The Standard Model and Beyond

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

Top quark polarization as a probe of charged Higgs bosons

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