Physics Case for the International Linear Collider

Fujii, Keisuke; Grojean, Christophe; Peskin, Michael E.; Barklow, T.; Gao, Y.; Kanemura, Shinya; Kim, Hyungdo; List, Jenny; Nojiri, Mihoko M.; Perelstein, Maxim; Poeschl, Roman; Reuter, Jürgen; Simon, F.; Tanabe, T.; Yu, J.; Wells, James D.; Murayama, Hitoshi; Yamamoto, H.

doi:10.48550/arxiv.1506.05992

Cited by 119 publications

(199 citation statements)

References 38 publications

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“…Note that this postdiction depends on the representation of the ψ (c) states. Thus, precise measurements of M t (such as those possible with the ILC [21]) can probe the UV content of this theory. The small range of allowed top quark masses can be understood as follows.…”

Section: A Predictive η Solution To the Strong Cp Problemmentioning

confidence: 99%

Solving the Wrong Hierarchy Problem

Blinov,

Hook

2016

Preprint

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Many theories require augmenting the Standard Model with additional scalar fields with large order one couplings. We present a new solution to the hierarchy problem for these scalar fields. We explore parity-and Z 2 -symmetric theories where the Standard Model Higgs potential has two vacua. The parity or Z 2 copy of the Higgs lives in the minimum far from the origin while our Higgs occupies the minimum near the origin of the potential. This approach results in a theory with multiple light scalar fields but with only a single hierarchy problem, since the bare mass is tied to the Higgs mass by a discrete symmetry. The new scalar does not have a new hierarchy problem associated with it because its expectation value and mass are generated by dimensional transmutation of the scalar quartic coupling. The location of the second Higgs minimum is not a free parameter, but is rather a function of the matter content of the theory. As a result, these theories are extremely predictive. We develop this idea in the context of a solution to the strong CP problem. We show this mechanism postdicts the top Yukawa to be within 1σ of the currently measured value and predicts scalar color octets with masses in the range 9-200 TeV.

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Section: A Predictive η Solution To the Strong Cp Problemmentioning

confidence: 99%

Solving the Wrong Hierarchy Problem

Blinov,

Hook

2016

Preprint

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“…5 could be as large as 10% more than the SM prediction value. Such large deviation in the hhh coupling can be measured at future collider experiments [21], and thus we could check whether a first-order EWPT can be realized or not by measurements of the hhh coupling.…”

Section: Numerical Results On Phase Transition Patternmentioning

confidence: 97%

Electroweak phase transition triggered by fermion sector

Cao,

Hashino,

et al. 2021

Preprint

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To realize first-order electroweak phase transition, it is necessary to generate a barrier in the thermal Higgs potential, which is usually triggered by scalar degree of freedom. We instead investigate phase transition patterns in pure fermion extensions of the standard model, and find that additional fermions with mass hierarchy and mixing could develop such barrier and realize strongly first-order phase transition in such models. In the Higgs potential with polynomial parametrization, the barrier can be generated in the following two patterns: (I) positive quadratic term, negative cubic term and positive quartic term or (II) positive quadratic term, negative quartic term and positive higher dimensional term, such as dimensional 6 operator.

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“…In addition, if the additional neutral Higgs bosons are detected at the HL-LHC or at future lepton colliders, the CP-violating coupling ζ e would be tested by observing the azimuthal angle distribution of the hadronic decay of the tau leptons from the decays of H 2 and H 3 at future e + -e − colliders such as the ILC [72,146] The strongly 1st order phase transition in our model can be tested by measuring the deviation in the triple Higgs boson coupling via the di-Higgs production at future highenergy colliders [51][52][53][54][55][56][57]. At the HL-LHC and the upgraded ILC with √ s = 500 GeV (1 TeV), the triple Higgs boson coupling is expected to be measured by the accuracies of 50 % [130] and 27 % (10 %) [56,131], respectively. As shown in Figs.…”

Section: Discussionmentioning

confidence: 99%

“…In the two pink regions, the observed baryon asymmetry can be explained with better than 95 % C.L. In these regions, ∆R is expected to be 35-55 %, and it would be tested at the HL-LHC [130] and the future upgraded ILC [56,131] and CLIC [132]. In the orange and red regions sandwiched between the pink regions, the baryon number is overproduced.…”

Section: Numerical Evaluation For the Baryon Asymmetry Of The Universementioning

confidence: 99%

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Electroweak baryogenesis in aligned two Higgs doublet models

Enomoto,

Kanemura,

Mura

2021

Preprint

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We evaluate the baryon number abundance based on the charge transport scenario of top quarks in the CP-violating two Higgs doublet model, in which Yukawa interactions are aligned to avoid dangerous flavor changing neutral currents, and coupling constants of the lightest Higgs boson with the mass 125 GeV coincide with those in the standard model at tree level to satisfy the current LHC data. In this model, the severe constraint from the electric dipole moment of electrons, which are normally difficult to be satisfied, can be avoided by destructive interferences between CP-violating phases in Yukawa interactions and scalar couplings in the Higgs potential. Viable benchmark

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Physics Case for the International Linear Collider

Cited by 119 publications

References 38 publications

Solving the Wrong Hierarchy Problem

Solving the Wrong Hierarchy Problem

Electroweak phase transition triggered by fermion sector

Electroweak baryogenesis in aligned two Higgs doublet models

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