Top-quark mass measurements: Review and perspectives

Cortiana, G.

doi:10.1016/j.revip.2016.04.001

Cited by 15 publications

(16 citation statements)

References 96 publications

(150 reference statements)

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“…In some cases, the new methods, although originally formulated for new physics measurements, might be "serious" alternatives to existing techniques even for SM particles, being useful for improving the associated precision or as a cross-check of the previous measurements (see, for example, the need for such methods for the case of the top quark discussed in ref. [91,92] and the recent application of the kinematic end-point methods to this measurement [69]. )…”

Section: Discussionmentioning

confidence: 99%

Energy spectra of massive two-body decay products and mass measurement

Agashe

Franceschini

Hong

et al. 2016

J. High Energ. Phys.

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Abstract:We have recently established a new method for measuring the mass of unstable particles produced at hadron colliders based on the analysis of the energy distribution of a massless product from their two-body decays. The central ingredient of our proposal is the remarkable result that, for an unpolarized decaying particle, the location of the peak in the energy distribution of the observed decay product is identical to the (fixed) value of the energy that this particle would have in the rest-frame of the decaying particle, which, in turn, is a simple function of the involved masses. In addition, we utilized the property that this energy distribution is symmetric around the location of peak when energy is plotted on a logarithmic scale. The general strategy was demonstrated in several specific cases, including both beyond the standard model particles, as well as for the top quark. In the present work, we generalize this method to the case of a massive decay product from a two-body decay; this procedure is far from trivial because (in general) both the abovementioned properties are no longer valid. Nonetheless, we propose a suitably modified parametrization of the energy distribution that was used successfully for the massless case, which can deal with the massive case as well. We test this parametrization on concrete examples of energy spectra of Z bosons from the decay of a heavier supersymmetric partner of top quark (stop) into a Z boson and a lighter stop. After establishing the accuracy of this parametrization, we study a realistic application for the same process, but now including dominant backgrounds and using foreseeable statistics at LHC14, in order to determine the performance of this method for an actual mass measurement. The upshot of our present and previous work is that, in spite of energy being a Lorentz-variant quantity, its distribution emerges as a powerful tool for mass measurement at hadron colliders.

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Section: Discussionmentioning

confidence: 99%

Energy spectra of massive two-body decay products and mass measurement

Agashe

Franceschini

Hong

et al. 2016

J. High Energ. Phys.

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“…For general review articles on top quark physics, we refer to Refs. [248,249]. In addition to its importance for precision tests of the electroweak sector, the top quark mass also play a decisive role in the extrapolation of the Standard Model to high energy scales, far beyond the electroweak scale.…”

Section: On the Importance Of The Top Quark Mass Within The Standard mentioning

confidence: 99%

Electroweak precision tests of the Standard Model after the discovery of the Higgs boson

Erler

Schott

2019

Progress in Particle and Nuclear Physics

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The global fit of the Standard Model predictions to electroweak precision data, which has been routinely performed in the past decades by several groups, led to the prediction of the top quark and the Higgs boson masses before their respective discoveries. With the measurement of the Higgs boson mass at the Large Hadron Collider (LHC) in 2012 by the ATLAS and CMS collaborations, the last free parameter of the Standard Model of particle physics has been fixed, and the global electroweak fit can be used to test the full internal consistency of the electroweak sector of the Standard Model and constrain models beyond. In this article, we review the current state-of-the-art theoretical calculations, as well as the precision measurements performed at the LHC, and interpret them within the context of the global electroweak fit. Special focus is drawn in the impact of the Higgs boson mass on the fit.

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“…Ref. [77] for a recent review. A theorist's combination of the pole mass, derived from the cross-section measurements, reads m t = 173.5 ± 1.1 GeV [76].…”

Section: Z 2 Higgs-portal Scalar Modelmentioning

confidence: 99%

Cosmological implications of Standard Model criticality and Higgs inflation

et al. 2020

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The observed Higgs mass indicates that the Standard Model can be valid up to near the Planck scale M P . Within this framework, it is important to examine how little modification is necessary to fit the recent experimental results in particle physics and cosmology. As a minimal extension, we consider the possibility that the Higgs field plays the role of inflaton and that the dark matter is the Higgs-portal scalar field. We assume that the extended Standard Model is valid up to the string scale 10 17 GeV. (This translates to the assumption that all the non-minimal couplings are not particularly large, ξ 10 2 , as in the critical Higgs inflation, since M P / √ 10 2 ∼ 10 17 GeV.) We find a correlated theoretical bound on the tensor-to-scalar ratio r and the dark matter mass m DM . As a result, the Planck bound r < 0.09 implies that the dark-matter mass must be smaller than 1.1 TeV, while the PandaX-II bound on the dark-matter mass m DM > 0.7 ± 0.2 TeV leads to r 2 × 10 −3 . Both are within the range of near-future detection. When we include the right-handed neutrinos of mass M R ∼ 10 14 GeV, the allowed region becomes wider, but we still predict r 10 −3 in the most of the parameter space. The most conservative bound becomes r > 10 −5 if we allow three-parameter tuning of m DM , M R , and the top-quark mass. *

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Top-quark mass measurements: Review and perspectives

Cited by 15 publications

References 96 publications

Energy spectra of massive two-body decay products and mass measurement

Energy spectra of massive two-body decay products and mass measurement

Electroweak precision tests of the Standard Model after the discovery of the Higgs boson

Cosmological implications of Standard Model criticality and Higgs inflation

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