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International Linear Collider Reference Design Report Volume 2: PHYSICS AT THE ILC

Abdelhak Djouadi, Joseph Lykken, Klaus Mönig, Yasuhiro Okada, Mark Oreglia, Satoru Yamashita

TL;DR

The paper articulates a comprehensive physics case for the ILC, centering on precision Higgs measurements, exploration of SUSY Higgs sectors (MSSM, NMSSM, and CP-violating scenarios), and sensitivity to beyond-Standard-Model phenomena, all within a baseline running plan of $\sqrt{s}=500\,\mathrm{GeV}$ and potential upgrades to $1\,\mathrm{TeV}$. It details Higgs production channels—Higgs-strahlung and $WW$ fusion—and the capabilities for model-independent mass and coupling determinations via recoil techniques, supported by stringent detector requirements (vertexing, jet energy resolution) and beam polarization control. The document contrasts LHC capabilities with the ILC, highlighting the ILC’s essential role in resolving Higgs sector structure, distinguishing MSSM/NMSSM scenarios, and probing extended gauge sectors (e.g., $Z'$) or extra dimensions through precision measurements and collider modes. It also outlines optional collider configurations, such as $e^-e^-$ and $\gamma\gamma$ modes, and emphasizes the long-term, 20–30 year program needed to fully exploit the ILC’s potential for testing electroweak symmetry breaking and the nature of fundamental interactions.

Abstract

This article reviews the physics case for the ILC. Baseline running at 500 GeV as well as possible upgrades and options are discussed. The opportunities on Standard Model physics, Higgs physics, Supersymmetry and alternative theories beyond the Standard Model are described.

International Linear Collider Reference Design Report Volume 2: PHYSICS AT THE ILC

TL;DR

The paper articulates a comprehensive physics case for the ILC, centering on precision Higgs measurements, exploration of SUSY Higgs sectors (MSSM, NMSSM, and CP-violating scenarios), and sensitivity to beyond-Standard-Model phenomena, all within a baseline running plan of and potential upgrades to . It details Higgs production channels—Higgs-strahlung and fusion—and the capabilities for model-independent mass and coupling determinations via recoil techniques, supported by stringent detector requirements (vertexing, jet energy resolution) and beam polarization control. The document contrasts LHC capabilities with the ILC, highlighting the ILC’s essential role in resolving Higgs sector structure, distinguishing MSSM/NMSSM scenarios, and probing extended gauge sectors (e.g., ) or extra dimensions through precision measurements and collider modes. It also outlines optional collider configurations, such as and modes, and emphasizes the long-term, 20–30 year program needed to fully exploit the ILC’s potential for testing electroweak symmetry breaking and the nature of fundamental interactions.

Abstract

This article reviews the physics case for the ILC. Baseline running at 500 GeV as well as possible upgrades and options are discussed. The opportunities on Standard Model physics, Higgs physics, Supersymmetry and alternative theories beyond the Standard Model are described.

Paper Structure

This paper contains 15 sections, 1 equation, 12 figures.

Table of Contents

  1. Introduction
  2. Questions about the universe
  3. The new landscape of particle physics
  4. Running scenarios
  5. Physics and the detectors
  6. Higgs physics
  7. The Higgs sector of the SM and beyond
  8. The Higgs boson in the SM
  9. The Higgs particles in the MSSM
  10. Higgs bosons in non--minimal SUSY models
  11. Higgs bosons in alternative models
  12. The expectations at the LHC
  13. The Higgs boson in the Standard Model
  14. Higgs decays and production
  15. Higgs detection at the ILC

Figures (12)

  • Figure 1: Histogram of mass recoiling from dimuons at $\sqrt s = 500~\,\mathrm{ Ge V} \textrm{Ge V}$ for a Higgs boson mass of 120 Ge V, for two values of the tracking resolution; from Ref. Hewett:2005ec.
  • Figure 2: Left: purity v.s. efficiency for tagging of $b$ and $c$ jets in a simulated VTX detector described in the text; the points labeled "$c$ ($b$ bkgr)" indicate the case where only $b$--quark backgrounds are present in the $c$--study; from Ref. Hillert2006. Right: purity factor $d$ (for "dilution") for the process $e^+e^- \rightarrow \nu\bar{\nu} WW/$$e^+e^- ZZ$ as a function of invariant mass cut for two values of the energy resolution; from Ref. Behnke:2001qq.
  • Figure 3: Simulation of a 100 Ge V jet using the MOKKA simulation of the TESLA TDR detector; colors show tracks-cluster associations using PandoraPFA; from Ref. Thomson:2006dc.
  • Figure 4: Left: Global fit to the electroweak precision data within the SM; the excluded region form direct Higgs searches is also shown LEPEWWG. Right: theoretical upper and lower bounds on $M_H$ from the assumption that the SM is valid up to the cut--off scale $\Lambda$Hambye:1996wb.
  • Figure 5: The masses (left) and the couplings to gauge bosons (right) of the MSSM Higgs bosons as a function of $M_A$ for $\tan\beta=3,30$ with $M_S=2$ TeV and $X_t=\sqrt 6 M_S$.
  • ...and 7 more figures