Particle Physics Experiments at JLC

TL;DR

<3-5 sentence high-level summary>ACFA’s Particle Physics Experiments at JLC outlines a comprehensive plan for a high-luminosity, polarized e+e- linear collider to probe the Higgs, top quark, and SUSY sectors. It details the detector model, accelerator complex, and parameter sets, and discusses Higgs production mechanisms, precision Higgs measurements, and model discrimination between SM, MSSM, NMSSM, and alternative theories. The SUSY chapters present extensive simulation studies across slepton, squark, chargino/neutralino sectors, exploring mass, mixing, and CP-violating observables, with emphasis on beam polarization and detector performance to test SUSY-breaking mechanisms. The Top Quark Physics section emphasizes threshold scans for precise m_t determinations and toponium dynamics, highlighting the interplay of QCD and EW effects in a clean e+e- environment. Overall, the report argues that JLC can deliver transformative tests of the Higgs mechanism, SUSY parameter space, and top-quark dynamics, with potential discoveries and high-precision measurements guiding future high-scale theory.

Abstract

ACFA Linear Collider Working Group report

Figures (321)

• Figure 1: Configuration of the baseline JLC detector.
• Figure 2: Schematic Layout of JLC. Not to scale. DR: Damping Ring, BC: Bunch Compressor, FFS: Final Focus System, IP: Interaction Point.
• Figure 3: Schematic layout of the bypass
• Figure 4: An example of beam energy spread at 250 GeV changing the RF phase. An initial spread of 1.5% (rms) at 10 GeV has been added.
• Figure 5: Luminosity spectrum at $W_{cm}$=500 GeV for the parameter set A (thin solid) and Y (solid). The beam energy spread before collision is not included.