scholarly journals Discrimination of new physics models with the International Linear Collider

2011 ◽  
Vol 84 (11) ◽  
Author(s):  
Masaki Asano ◽  
Tomoyuki Saito ◽  
Taikan Suehara ◽  
Keisuke Fujii ◽  
R. S. Hundi ◽  
...  
Keyword(s):  
Linear Collider ◽  
International Linear Collider ◽  
New Physics

scholarly journals Beam Polarization at the ILC: Physics Case and Realization

2016 ◽  
Vol 40 ◽  
pp. 1660003 ◽  
Author(s):  
Annika Vauth ◽  
Jenny List
Keyword(s):  
Precision Measurement ◽  
Linear Collider ◽  
International Linear Collider ◽  
New Physics ◽  
Beam Polarization ◽  
Technical Aspects ◽  
Polarized Beams ◽  
Physics Program ◽  
The Standard Model ◽  
The Creation

The International Linear Collider (ILC) is a proposed [Formula: see text] collider, focused on precision measurement of the Standard Model and new physics beyond. Polarized beams are a key element of the ILC physics program. The physics studies are accompanied by an extensive R&D program for the creation of the polarized beams and the measurement of their polarization. This contribution will review the advantages of using beam polarization and its technical aspects and realization, such as the creation of polarized beams and the measurement of the polarization.

The Search for New Physics Phenomena using e-e- Collisions in the CLIC Energy Range

2005 ◽  
Vol 20 (31) ◽  
pp. 7338-7346 ◽  
Author(s):  
Clemens A. Heusch
Keyword(s):  
Energy Range ◽  
Energy Region ◽  
Linear Collider ◽  
International Linear Collider ◽  
New Physics

The International Linear Collider project, now no longer on the back burner, finds its natural sequel in the several-TeV realm by relying on CLIC technology. We briefly home in on a few of those physics processes initiated by e-e- collision where the extension to that higher energy region is likely to be of major importance.

scholarly journals Tau $$g{-}2$$ at $$e^-e^+$$ colliders with momentum-dependent form factor

2021 ◽  
Vol 81 (2) ◽  
Author(s):  
Hieu Minh Tran ◽  
Yoshimasa Kurihara
Keyword(s):  
Form Factor ◽  
Linear Collider ◽  
International Linear Collider ◽  
Large Mass ◽  
New Physics ◽  
Magnetic Form Factor ◽  
Beam Polarization ◽  
Electron Positron ◽  
Dependent Form ◽  
Model Independent

AbstractThe deviation between the prediction based on the standard model and the measurement of the muon $$g{-}2$$ g - 2 is currently at $$3{-}4 \sigma $$ 3 - 4 σ . If this discrepancy is attributable to new physics, it is expected that the new contributions to the tau $$g{-}2$$ g - 2 even larger than those of muon due to its large mass. However, it is much more difficult to directly measure the tau $$g{-}2$$ g - 2 because of its short lifetime. In this report, we consider the effect of the tau $$g{-}2$$ g - 2 at $$e^-e^+$$ e - e + colliders using a model independent approach. Using the tau pair production channel at the Large Electron Position Collider (LEP), we have determined the allowed range for the new physics contribution of the tau $$g{-}2$$ g - 2 assuming a q-square-dependence ansatz for the magnetic form factor. We also investigated the prospect at future $$e^+e^-$$ e + e - colliders, such as International Linear Collider, the Compact Linear Collider, the Future Circular $$e^+e^-$$ e + e - Collider, and Circular Electron Positron Collider, and determined the expected allowed range for the new physics contribution to the tau anomalous magnetic moment. The best limits are about $$4{-}5$$ 4 - 5 times more severe than the LEP one due to the beam polarization and the high luminosities at future colliders.

scholarly journals Next-to-leading-order corrections to the Higgs strahlung process from electron–positron collisions in extended Higgs models

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Masashi Aiko ◽  
Shinya Kanemura ◽  
Kentarou Mawatari
Keyword(s):  
Total Cross Section ◽  
Cross Section ◽  
Linear Collider ◽  
International Linear Collider ◽  
Higgs Doublet ◽  
New Physics ◽  
Leading Order ◽  
Helicity Amplitudes ◽  
Doublet Model ◽  
Positron Collisions

AbstractWe present the cross section for $$e^{+}e^{-}\rightarrow hZ$$ e + e - → h Z with arbitrary sets of electron and Z boson polarizations at the full next-to-leading order in various extended Higgs models, such as the Higgs singlet model (HSM), the inert doublet model (IDM) and the two Higgs doublet model (2HDM). We systematically perform complete one-loop calculations to the helicity amplitudes in the on-shell renormalization scheme, and present the full analytic results as well as numerical evaluations. The deviation $$\Delta R^{hZ}$$ Δ R hZ in the total cross section from its standard model (SM) prediction is comprehensively analyzed, and the differences among these models are discussed in details. We find that new physics effects appearing in the renormalized hZZ vertex almost govern the behavior of $$\Delta R^{hZ}$$ Δ R hZ , and it takes a negative value in most cases. The possible size of $$\Delta R^{hZ}$$ Δ R hZ reaches several percent under the theoretical and experimental bounds. We also analyze the deviation $$\Delta R^{hZ}_{XY}$$ Δ R XY hZ in the total cross section times decay branching ratios of the discovered Higgs boson by utilizing the program. It is found that the four types of 2HDMs can be discriminated by analyzing the correlation between $$\Delta R^{hZ}_{\tau \tau }$$ Δ R τ τ hZ and $$\Delta R^{hZ}_{bb}$$ Δ R bb hZ and those between $$\Delta R^{hZ}_{\tau \tau }$$ Δ R τ τ hZ and $$\Delta R^{hZ}_{cc}$$ Δ R cc hZ . Furthermore, the HSM and the IDM can be discriminated from the 2HDMs by measuring $$\Delta R^{hZ}_{WW}$$ Δ R WW hZ . These signatures can be tested by precision measurements at future Higgs factories such as the International Linear Collider.

scholarly journals New physics implication of Higgs precision measurements

2019 ◽  
Vol 34 (13n14) ◽  
pp. 1940012 ◽  
Author(s):  
Ning Chen ◽  
Jiayin Gu ◽  
Tao Han ◽  
Honglei Li ◽  
Zhen Liu ◽  
...  
Keyword(s):  
Standard Model ◽  
Linear Collider ◽  
International Linear Collider ◽  
Higgs Doublet ◽  
New Physics ◽  
Mass Scale ◽  
Direct Search ◽  
Precision Measurements ◽  
Tree Level ◽  
Higgs Search

Studying the properties of the Higgs boson can be an important window to explore the physics beyond the Standard Model (SM). In this work, we present studies on the implications of the Higgs precision measurements at future Higgs Factories. We perform a global fit to various Higgs search channels to obtain the 95% C.L. constraints on the model parameter spaces of two-Higgs Doublet Model (2HDM) and Minimal Supersymmetric Standard Model (MSSM). In the 2HDM, we analyze tree-level effects as well as one-loop contributions from the heavy Higgs bosons. The strong constraints on [Formula: see text], heavy Higgs masses and their mass splitting are complementary to direct search of the LHC as well as possible future [Formula: see text] pole precision measurements. For the MSSM, we study both the Higgs couplings and mass precisions. The constraints on the CP-odd Higgs mass [Formula: see text] and stop mass scale [Formula: see text] can be complementary to the direct search of HL-LHC. We also compare the sensitivity of various future Higgs factories, namely, Circular Electron Positron Collider (CEPC), Future Circular Collider (FCC)-ee and International Linear Collider (ILC).

scholarly journals Digital low level rf control system for the International Linear Collider

2018 ◽  
Vol 21 (8) ◽  
Author(s):  
Sigit Basuki Wibowo ◽  
Toshihiro Matsumoto ◽  
Shinichiro Michizono ◽  
Takako Miura ◽  
Feng Qiu ◽  
...  
Keyword(s):  
Control System ◽  
Linear Collider ◽  
International Linear Collider ◽  
Low Level
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