Abstract
The International Linear Collider (ILC) is a proposed e + e − linear collider with a centre-of-mass energy of 200-500 GeV, based on superconducting RF cavities. The ILC would be an ideal machine for precision studies of a light Higgs boson and the top quark, and would have a discovery potential for new particles that is complementary to that of LHC. The clean experimental conditions would allow the operation of detectors with extremely good performance; two such detectors, ILD and SiD, are currently being designed. Both make use of novel concepts for tracking and calorimetry. The Japanese High Energy Physics community has recently recommended to build the ILC in Japan.
Highlights
For more than 50 years, e+e− colliders have been a indispensable tool in high-energy physics, at which important particles such as the J/ψ, the Υ, the τ lepton and the gluon were first observed and the properties of the W± and Z0 gauge bosons were studied at unprecedented detail, establishing today’s Standard Model of elementary particle physics
Further measurements of the Higgs branching fractions would benefit from a higher centre-ofmass energy, around 350 GeV, because the resulting boost would be beneficial for the tagging of the final state; at the International Linear Collider (ILC), even the branching fraction to charm, beauty and invisible decay products will be measurable with to better than 5 % (Figure 2 right)
A complete characterization of the Higgs boson’s properties requires a clean e+e− collider with a centre-of-mass energy tunable between 215 and 500 GeV or more, which is precisely the charge given to the Global Design Effort in 2003 by the “Heuer panel” [3]
Summary
For more than 50 years, e+e− colliders have been a indispensable tool in high-energy physics, at which important particles such as the J/ψ, the Υ, the τ lepton and the gluon were first observed and the properties of the W± and Z0 gauge bosons were studied at unprecedented detail, establishing today’s Standard Model of elementary particle physics. About 20 GeV above threshold, at around 235 GeV CME, the production cross section in the Z0h is maximal At this energy, a unique measurement would be performed: the determination of the absolute Z0h coupling by a recoil mass measurement in the process e+e− → Z0h. From the recoil mass spectrum (see Figure 2 left), the total Z0h production cross section and the absolute Z0h coupling can be determined This measurement depends crucially on the knowledge of the four-momentum of the initial state, that is, it needs an energy spectrum of the incoming electrons and positrons that is as narrow as possible. A complete characterization of the Higgs boson’s properties requires a clean e+e− collider with a centre-of-mass energy (precisely) tunable between 215 and 500 GeV or more, which is precisely the charge given to the Global Design Effort in 2003 by the “Heuer panel” [3]
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