Future Circular Collider Study

Abada, A.; al., et

doi:10.2172/1527436

Cited by 182 publications

(288 citation statements)

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“…For the electron Yukawa coupling, the current limit κ e < 611 [65] is based on the direct search for h → e + e − . A preliminary study at the FCC ee [66] has assessed the reach of a dedicated run at √ s = m H . At this energy the cross section for e + e − → h is 1.64 fb, which reduces to 0.3 with an energy spread equal to the SM Higgs width.…”

Section: Rare Higgs Boson Decaysmentioning

confidence: 99%

“…And one must then consider the possibility of obtaining a better sensitivity by measuring such processes. For instance, FCC-hh can probe gg → HV L and VV → VV up to ε ∼ 1% [66]. Lepton machines might compete better: while CLIC can reach a sensitivity to ε ∼ 10 −2 in VV → HH [106], still one order of magnitude poorer than single Higgs measurements, a recent analysis [64] of a muon collider shows the ε = 10 −3 wall is beaten for a CM energy of 10 TeV.…”

Section: What and Why: Higgs Prospect Studies Beyond This Reportmentioning

confidence: 99%

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Higgs Boson studies at future particle colliders

Blas

Cepeda

D’Hondt

et al. 2020

J. High Energ. Phys.

303

353

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This document aims to provide an assessment of the potential of future colliding beam facilities to perform Higgs boson studies. The analysis builds on the submissions made by the proponents of future colliders to the European Strategy Update process, and takes as its point of departure the results expected at the completion of the HL-LHC program. This report presents quantitative results on many aspects of Higgs physics for future collider projects using uniform methodologies for all proposed machine projects of sufficient maturity. This report is still preliminary and is distributed for the purposes of discussion at the Open Symposium in Granada (13-16/05/2019). 2/583/58 9/58 10/58 15/58 16 In fact, the width and the branching ratio to undetected final states are not independent observables. In the analysis presented in Section 3.2 we opted to fit BR unt and calculate Γ H from Eq. (4).

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Section: Rare Higgs Boson Decaysmentioning

confidence: 99%

Section: What and Why: Higgs Prospect Studies Beyond This Reportmentioning

confidence: 99%

Higgs Boson studies at future particle colliders

Blas

Cepeda

D’Hondt

et al. 2020

J. High Energ. Phys.

303

353

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“…The numerically relevant two-loop and partial higher-order corrections were included in the final analysis of LEP 1 data [44]. 1 The theoretical advances described here go beyond the Standard Model theory used for physics at LEP 1 [45,46] but will be needed for the FCC-ee Tera-Z project [6,7,[50][51][52] whose unique experimental precision calls for perturbative predictions at three electroweak loops together with corresponding QCD terms.…”

Section: Introductionmentioning

confidence: 99%

Electroweak pseudo-observables and Z-boson form factors at two-loop accuracy

Dubovyk

Freitas

Gluza

et al. 2019

J. High Energ. Phys.

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We present Standard Model predictions for the complete set of phenomenologically relevant electroweak precision pseudo-observables related to the Zboson: the leptonic and bottom-quark effective weak mixing angles sin 2 θ eff , sin 2 θ b eff , the Z-boson partial decay widths Γ f , where f indicates any charged lepton, neutrino and quark flavor (except for the top quark), as well as the total Z decay width Γ Z , the branching ratios R , R c , R b , and the hadronic cross section σ 0 had . The input parameters are the masses M Z , M H and m t , and the couplings α s , α. The scheme dependence due to the choice of M W or its alternative G µ as a last input parameter is also discussed. Recent substantial technical progress in the calculation of Minkowskian massive higher-order Feynman integrals allows the calculation of the complete electroweak two-loop radiative corrections to all the observables mentioned. QCD contributions are included appropriately. Results are provided in terms of simple and convenient parameterization formulae whose coefficients have been determined from the full numerical multi-loop calculation. The size of the missing electroweak three-loop or QCD higher-order corrections is estimated. We briefly comment on the prospects for their calculation. Finally, direct predictions for the Zf f vector and axial-vector form-factors are given, including a discussion of separate order-by-order contributions.

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“…Refs. [38,39] are listed in Table II, Table III, and Table IV, respectively. We now describe each fiducial volume for the calculation of P [X the expression for P [X i in IT] is given by…”

Section: Detector Setups Simulation and Calculationmentioning

confidence: 99%

“…As long as one of the LLPs travels inside the IT window, and decays before it leaves [38] while the geometries of the IDEA detectors of the FCC-ee are reproduced from Ref. [39]. V represents the volume and similarly in Table III and Table IV. the IT (including the case that the secondary vertex is inside the beam pipe up to d res ),…”

Section: Detector Setups Simulation and Calculationmentioning

confidence: 99%

Probing long-lived particles at Higgs factories

Cheung

Wang

2020

Phys. Rev. D

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We study displaced vertex signatures of long-lived particles (LLPs) from exotic Higgs decays in the context of a Higgs-portal model and a neutral-naturalness model at the CEPC and FCCee. Such two models feature two representative mass ranges for LLPs, which show very different behavior in their decay signatures. The Higgs-portal model contains a very light sub-GeV scalar boson stemming from a singlet scalar field appended to the Standard Model. Such a light scalar LLP decays into a pair of muons or pions, giving rise to a distinctive signature of collimated muonjet or pion-jet, thanks to the sub-GeV mass. On the other hand, the neutral-naturalness model, e.g., folded supersymmetry, predicts the lightest mirror glueball of mass O(10) GeV, giving rise to long decays with a large transverse impact parameter because of the relatively large mass. Utilizing such distinct characteristics to remove the background, we estimate the sensitivities of searches for light scalar bosons and mirror glueballs at the CEPC and FCC-ee. We find either complementary or stronger coverage compared to the previous results in the similar contexts.

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Future Circular Collider Study

Cited by 182 publications

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Higgs Boson studies at future particle colliders

Higgs Boson studies at future particle colliders

Electroweak pseudo-observables and Z-boson form factors at two-loop accuracy

Probing long-lived particles at Higgs factories

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