FURTHER STUDIES OF HIGGS PROPERTIES AT AN ILC Γγ COLLIDER

He, Xiao‐Gang; Li, Siao-Fong; Lin, Hsiu-Hsien

doi:10.1142/s0217732313500855

Cited by 3 publications

(6 citation statements)

References 22 publications

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“…We show that by studying angular distribution of the final γγ through on-shell production of φ and its subsequent decays into a γγ pair, one can easily determine whether φ is a spin-0 or spin-2 state. The work presented closely follow previous study of Higgs boson at a γγ collider by one of us (He) [2].…”

Section: Introductionsupporting

confidence: 68%

“…In principle, there should be other possible decay modes other than φ → γγ, although at present only φ → γγ has been observed. One can easily measure the relative branching ratios for other decay modes, because [2]…”

Section: Introductionmentioning

confidence: 99%

“…Therefore some of the strategies at future collider for the study of φ can be employed except that the energy has to be increased. In particular we note that a γγ collider may be an ideal place to study some of the most important properties of the possible new resonant state φ similar to the study of Higgs boson properties [2].…”

Section: Introductionmentioning

confidence: 99%

“…For example the e + e − ILC collider. Such a collider has been shown to be useful to study beyond SM physics [2,9]. In this case the energy E γ of the photons are not monochromatic, but have a distribution f (x = E γ /E e ) for a given electron/positron energy E e [10].…”

Section: Introductionmentioning

confidence: 99%

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A γγ collider for the 750 GeV resonant state

Tang

2016

Physics Letters B

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Recent data collected by ATLAS and CMS at 13 TeV collision energy of the LHC indicate the existence of a new resonant state φ with a mass of 750 GeV decaying into two photons γγ. The properties of φ should be studied further at the LHC and also future colliders. Since only φ → γγ decay channel has been measured, one of the best ways to extract more information about φ is to use a γγ collider to produce φ at the resonant energy. In this work we show how a γγ collider helps to verify the existence of φ and to provide some of the most important information about the properties of φ, such as branching fractions of φ → V 1 V 2 . Here V i can be γ, Z, or W ± . We also show that by studying angular distributions of the final γ's in γγ → φ → γγ, one can obtain crucial information about whether this state is a spin-0 or a spin-2 state.

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Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A γγ collider for the 750 GeV resonant state

Tang

2016

Physics Letters B

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“…We find that in this picture the mass of the composite Higgs boson at tree level is given by m Recently the ATLAS [1] and CMS [2] experiments at CERN have confirmed the existence of a Higgs like particle with a mass m H = 125.5 GeV which has approximately [3] all the properties of the standard model Higgs boson. The question remains if this Higgs boson is part of a larger structure like that of a supersymmetric model [4] or of a model with dynamical symmetry breaking.…”

mentioning

confidence: 90%

Tree level relations in a composite electroweak theory

2014

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We work out simple tree level relations in a top condensate model with dynamical electroweak symmetry breaking. We find that in this picture the mass of the composite Higgs boson at tree level is given by m where mt is the mass of the top quark. [8]. In this work we will consider the simple case of a single composite Higgs doublet. For simplicity we shall take the structure of this Higgs boson given by the top condensate models [9]:In [10] we explored the possibility that by analogy with the low energy QCD in this kind of model also four quark states belonging to an additional Higgs doublet and a Higgs triplet might exist. We shall neglect this possibility here. Here we make the simple assumption that the bound state form through a Nambu Jona-Lasinio [11] mechanism and rely on the simplest top condensate model described in [9]. For clarity we will resume to the electroweak sector of the standard model with only the top bottom quark doublet.The model we wish to discuss has the initial Lagrangian:where the kinetic term also includes the gauge interactions. It was shown in [9] that this Lagrangian generates a mass m t for the top quark, a composite scalar with the mass m s = 2m t and three massless pseudo Goldstone bosons. These states have the correct quantum numbers to lead to the dynamical breaking of the electroweak symmetry. The mass of the neutral scalar is obtained from the pole in the sum of the scalar channel fermion bubble and it is a definite prediction of this type of models. This prediction might be improved by considering corrections coming from the gauge sector and from higher order fermion operators but even in this case the predicted mass of the composite scalar is at least two times the mass of the Higgs boson found at the LHC. One might take as an example another Lagrangian that of a linear sigma model describing the light mesons in low energy QCD [12] which in its simplest form is:where the M field represents an octet of scalar and pseudoscalar mesons and the last term breaks explicitly the chiral symmetry and it is proportional to the mass of the light quarks (Note that the actual Lagrangian in [12] is more complex but we truncated it for the purpose of illustration). It turns out that the sigma in the simple model described *

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Searching for the doubly charged scalars in the Georgi–Machacek model via γγ collisions at the ILC

Cao

Liu

2018

Int. J. Mod. Phys. A

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The Georgi–Machacek (GM) model predicts the existence of the doubly-charged scalars [Formula: see text], which can be seen the typical particles in this model and their diboson decay channels are one of the most promising ways to discover such new doubly-charged scalars. Based on the constraints of the latest combined ATLAS and CMS Higgs boson diphoton signal strength data at [Formula: see text] confidence level, we focus on the study of the triple scalar production in [Formula: see text] collisions at the future International Linear collider (ILC): [Formula: see text], where the production cross-sections are very sensitive to the triple scalar coupling parameter [Formula: see text]. Considering the typical same-sign diboson decay modes for the doubly-charged scalars, the possible final signals might be detected via this process at the future ILC experiments.

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FURTHER STUDIES OF HIGGS PROPERTIES AT AN ILC Γγ COLLIDER

Cited by 3 publications

References 22 publications

A γγ collider for the 750 GeV resonant state

A γγ collider for the 750 GeV resonant state

Tree level relations in a composite electroweak theory

Searching for the doubly charged scalars in the Georgi–Machacek model via γγ collisions at the ILC

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