Detector System

Characteristics of Electron-Positron Reactions in TeV Region

The reactions are essentially governed by the electroweak interaction, which is one of our primary targets of experiments in the TeV region. There are thus no background reactions.
Almost all the fundamental particles are produced in pair via electron-positron annihilations and their properties can be studied in precision.
Weak bosons (W/Z particles) can copiously be produced in various reactions and new particles, if any, are expected to be likely to decay into heavy quarks or the W/Z bosons. The top quark also decays into a bottom quark and a W boson.
The important messages from the elementary processes in this energy region are carried by groups of hadrons (called jets), high energy leptons and photons, and heavy-flavored quarks.

Further Development of Detector Technology Established at TRISTAN

For TRISTAN experiments, we have been developing detector technology to simultaneously record and analyze events consisting of a lot of and various kinds of particles. The standard form of detector systems includes a large superconducting solenoidal magnet and various component detectors surrounding the interaction point.
Although the number of particles in a single event becomes much larger at JLC than at TRISTAN, they can be classified into a set of well-collimated jets. The JLC detector should be able to trace back each parent particle from its daughter jets in a cascade decay and thus should allow us to reconstruct the whole event.
Key technology lies in calorimeters to measure the direction and energy of jets, a vertex detector to identify heavy-flavored quarks (b-quark in particular), and the momentum measurement and identification of high-energy leptons. These are all challenging but possible as a straightforward extension of the detector technology developed during the TRISTAN experiments.

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