Top-Quark Physics at the LHC

Kroeninger, K.; Meyer, Andreas Bernhard; Uwer, Peter

doi:10.1007/978-3-319-15001-7_7

Cited by 9 publications

(7 citation statements)

References 156 publications

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“…In comparison, the measured single top production cross section of ∼ 115 ± 2 pb (CMS [48,49] and ATLAS [50][51][52]), which is compatible with the SM prediction [53], yields a total event sample of n t 2 × 10 6 events. Since the statistical fluctuations of this number are of the same order of magnitude as the number of hypothetical signal events, it might be possible -with a systematic analysis of the kinematic distributions -to extract the resonance already from the present data.…”

Section: Jhep01(2016)160supporting

confidence: 61%

Non-Abelian family symmetries as portals to dark matter

Varzielas

Fischer

2016

J. High Energ. Phys.

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Non-Abelian family symmetries offer a very promising explanation for the flavour structure in the Standard Model and its extensions. We explore the possibility that dark matter consists in fermions that transform under a family symmetry, such that the visible and dark sector are linked by the familons -Standard Model gauge singlet scalars, responsible for spontaneously breaking the family symmetry. We study three representative models with non-Abelian family symmetries that have been shown capable to explain the masses and mixing of the Standard Model fermions.One of our central results is the possibility to have dark matter fermions and at least one familon with masses on and even below the experimentally accessible TeV scale. In particular we discuss the characteristic signatures in collider experiments from light familon fields with a non-Abelian family symmetry, and we show that run I of the LHC is already testing this class of models.

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Section: Jhep01(2016)160supporting

confidence: 61%

Non-Abelian family symmetries as portals to dark matter

Varzielas

Fischer

2016

J. High Energ. Phys.

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“…Particularly, its mass around 173.1 GeV makes the top quark the heaviest among the SM particles and as a result allows it to decay much before the hadronization sets in. This behaviour single it out from other known quarks and gives us a probe of new physics [3][4][5][6].…”

Section: Introductionmentioning

confidence: 94%

“…where L (n) consists of operators of dimension n made of the SM fields obeying SU (2) L ⊗ U (1) Y gauge invariance. We can neglect the gauge invariant dimension 5 operator, L (5) (responsible for Majorana masses of neutrinos), which has no relevance in the quark sector. However, L (4) and L (6) can contribute to the flavour changing interactions.…”

Section: Introductionmentioning

confidence: 99%

Fingerprinting the top quark FCNC via anomalous Ztq couplings at the LHeC

et al. 2019

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A study of the top quark Flavour Changing Neutral Current (FCNC) through Z-boson has been performed in the proposed future e − p collider for the energy, E e(p) = 60 (7000) GeV. We considered an effective theory where the anomalous FCNC couplings are of vector and tensor nature. The effect of these couplings is probed in the single top production along with the scattered electron. The polar angle θ of the electrons coming out of the primary vertex in association with the top quark polarization asymmetries constructed from the angular distribution of the secondary lepton arising from the top decay, allow to distinguish the Lorentz structure of the coupling. From a multi-parameter analysis, we obtain a reach of O(10 −2 ) in the case of Ztu and Ztc couplings at an integrated luminosity of 2 ab −1 at 95% C.L.

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“…In this context, the top quark plays a special role: its lifetime is extremely short (≈ 10 −25 s) and inhibits top-quark bound states and topquark flavoured hadrons to be formed, offering a unique possibility to study the properties of the particle as a quasi-free quark (see Refs. [1,2] for recent reviews on the subject). The top quark is the heaviest elementary particle currently known and its mass (m top ) is a fundamental parameter of quantum chromodynamics (QCD), the quantum field theory describing the strong interactions of quarks and gluons.…”

Section: Introductionmentioning

confidence: 99%

Top-quark mass measurements: Review and perspectives

Cortiana

2016

Reviews in Physics

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The top quark is the heaviest elementary particle known and its mass (m top ) is a fundamental parameter of the Standard Model (SM). The m top value affects theory predictions of particle production cross-sections required for exploring Higgs-boson properties and searching for New Physics (NP). Its precise determination is essential for testing the overall consistency of the SM, to constrain NP models, through precision electroweak fits, and has an extraordinary impact on the Higgs sector, and on the SM extrapolation to high-energies. The methodologies, the results, and the main theoretical and experimental challenges related to the m top measurements and combinations at the Large Hadron Collider (LHC) and at the Tevatron are reviewed and discussed. Finally, the prospects for the improvement of the m top precision during the upcoming LHC runs are briefly outlined. [GeV] t m 140 150 160 170 180 190 [GeV] W M 80.25 80.3 80.35 80.4 80.45 80.5 68% and 95% CL contours measurements t and m W fit w/o M measurements H and M t , m W fit w/o M measurements t and m W direct M 1 ± world comb. W M 0.015 GeV ± = 80.385 W M 1 ± world comb. t m = 173.34 GeV t m = 0.76 GeV GeV theo 0.50 = 0.76 = 1 2 5 .1 4 G e V H M = 5 0 G e V H M = 3 0 0 G e V H M = 6 0 0 G e V H M G fitter SM Jul '14 (a)

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Top-Quark Physics at the LHC

Cited by 9 publications

References 156 publications

Non-Abelian family symmetries as portals to dark matter

Non-Abelian family symmetries as portals to dark matter

Fingerprinting the top quark FCNC via anomalous Ztq couplings at the LHeC

Top-quark mass measurements: Review and perspectives

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