The International Linear Collider Technical Design Report - Volume 2: Physics

Baer, Howard; Barklow, T.; Fujii, Keisuke; Gao, Y.; Hoang, André H.; Kanemura, Shinya; List, Jenny; Logan, Heather E.; Nomerotski, A.; Perelstein, Maxim; Peskin, Michael E.; Pöschl, R.; Reuter, Jürgen; Riemann, S.; Savoy-Navarro, A.; Servant, Géraldine; Tait, Tim M. P.; Yu, Jaehoon

doi:10.2172/1347944

Cited by 154 publications

(155 citation statements)

References 14 publications

(9 reference statements)

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“…As we have seen, the LHC promises to make considerable progress in answering fundamental questions surrounding the Higgs, as well as a host of longer-standing questions involving the underpinnings of the Standard Model. But the ultimate answers to questions surrounding the Higgs inevitably lie in proposed colliders such as CEPC [58,59], FCC-ee [60], the ILC [61,62], and CLIC [63,64] that would operate in part as Higgs factories. By achieving sensitivity to deviations from Standard Model Higgs couplings at the sub-percent level, these colliders would allow us to probe virtual corrections from beyond-the-Standard Model physics to tree-level processes in the Standard Model, bringing qualitatively new power to the search for new physics.…”

Section: Future Collidersmentioning

confidence: 99%

Theory Vision at LHCP 2019

Craig¹

2019

Proceedings of 7th Annual Conference on Large Hadron Collider Physics — PoS(LHCP2019)

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Section: Future Collidersmentioning

confidence: 99%

Theory Vision at LHCP 2019

Craig¹

2019

Proceedings of 7th Annual Conference on Large Hadron Collider Physics — PoS(LHCP2019)

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“…Here, in particular, the deviations in h → γ γ and the self coupling constant of the Higgs boson are as significant as 10-20%. By precise measurements of the SM-like Higgs boson couplings at future collider experiment such as the ILC [71,72], the model can be distinguished from the nMSSM too. Let us consider the Z 2 -odd sector.…”

Section: A Uv Picturementioning

confidence: 99%

A UV Picture of a Loop Induced Neutrino Mass Model and Its Phenomenological Consequences

Shindou

2019

Front. Phys.

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In this article, we review several models where tiny neutrino masses are radiatively generated via loop diagrams. In such models, additional scalar fields are often introduced so that the Standard Model Higgs sector is extended.Such an extension results in a rich phenomenology of the model. We briefly discuss such a model and its UV completion to highlight some of its phenomenological consequences.

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“…will constrain the masses and coupling parameters of any scalars propagating in the loop, where we have combined the experimental and SM prediction uncertainties in quadrature. Substantial improvement in the R b experimental measurement is unlikely in the near future, as this would require better Z-pole measurements using a nextgeneration e + e − collider like the International Linear Collider (ILC) with the GigaZ option [96]. The oscillation frequency is determined by the mass splitting between the particle and anti-particle states, Δm B s,d , and is given at next-to-leading order by [97,98]…”

Section: Z-decay To Bbmentioning

confidence: 99%

“…7.11, R b provides the weakest non-oblique experimental and best-fit constraints. Furthermore, substantial improvement in the R b experimental measurement is unlikely in the near future, as this would require better Z-pole measurements using a next-generation e + e − collider such as the International Linear Collider (ILC) with the GigaZ option[96].The theoretical, S-parameter, b → sγ, and B 0 s → μ + μ −11 constraints considered in Secs. 7.2 and 7.4 have been implemented in a public code called GMCalc[166] 11.…”

mentioning

confidence: 99%

Theoretical and Experimental Constraints on Large Electroweak Scalar Multiplets

Hartling¹

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We apply theoretical and experimental constraints to models that extend the Standard Model (SM) with scalar electroweak SU(2) L multiplets of isospin T ≥ 1.Using tree-level perturbative unitarity, we determine that such multiplets may have a maximum weak isospin T ≤ 7/2 (4) if they are complex (real). We also determine an upper bound on the hypercharge of a scalar SU(2) L multiplet as a function of its size n = 2T + 1. Using these bounds, we study two classes of models which extend the SM by a single scalar SU(2) L multiplet of isospin T ≥ 2 and which preserve an additional U (1) or Z 2 symmetry. By applying bounds from precision electroweak measurements, Higgs decays to two photons, and dark matter direct-detection, we determine that the U (1) models with isospin T = 5/2, 3, 7/2 are excluded. The Z 2 models remain viable, but can account for at most 1% of the dark matter in the universe at masses below 1 TeV.We also study the most general scalar potential of the Georgi-Machacek model, which extends the SM with two electroweak scalar triplets. We show that this model possesses a decoupling limit, and that in this limit the deviations of the Higgs couplings to vector bosons from their SM values may be larger and of opposite sign to those of the Two Higgs Doublet Model. We apply constraints from perturbativity, vacuum stability, electroweak precision observables, and B-physics, and demonstrate their effects on the model parameter space with numerical scans. We show thatsubject to these constraints -the Georgi-Machacek (GM) model can simultaneously enhance all of the Higgs couplings to Standard Model particles by up to 18%, corresponding to a 39% enhancement of all Higgs production modes. Finally, we derive general formulas for loop decays of the GM scalars to γγ, Zγ, and W + γ, and consider their effects on the scalar branching ratios in a benchmark case.ii

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The International Linear Collider Technical Design Report - Volume 2: Physics

Cited by 154 publications

References 14 publications

Theory Vision at LHCP 2019

Theory Vision at LHCP 2019

A UV Picture of a Loop Induced Neutrino Mass Model and Its Phenomenological Consequences

Theoretical and Experimental Constraints on Large Electroweak Scalar Multiplets

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