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Linear Collider Physics Resource Book for Snowmass 2001 - Part 1: Introduction

T. Abe

TL;DR

The book argues that a 500 GeV e+e- linear collider is a compelling next step to illuminate electroweak symmetry breaking via precise Higgs and new-physics measurements, with SUSY, top quark, and precision EW programs providing a broad, complementary physics portfolio. It outlines two viable collider technologies, realistic upgrade paths to multi-TeV scales, and a staged research program that leverages beam polarization and clean experimental environments to extract masses, couplings, and quantum numbers with unprecedented precision. The work also discusses how LC measurements would synergize with LHC discoveries, test grand unification, and probe exotic possibilities such as Z' bosons and extra dimensions, thereby shaping a long-term, 20-year strategy for TeV-scale physics. Overall, it establishes a cohesive case for constructing a 500 GeV linear collider as the foundation of a sustained exploration of the TeV frontier.”

Abstract

This Resource Book reviews the physics opportunities of a next-generation e+e- linear collider and discusses options for the experimental program. Part 1 contains the table of contents and introduction and gives a summary of the case for a 500 GeV linear collider.

Linear Collider Physics Resource Book for Snowmass 2001 - Part 1: Introduction

TL;DR

The book argues that a 500 GeV e+e- linear collider is a compelling next step to illuminate electroweak symmetry breaking via precise Higgs and new-physics measurements, with SUSY, top quark, and precision EW programs providing a broad, complementary physics portfolio. It outlines two viable collider technologies, realistic upgrade paths to multi-TeV scales, and a staged research program that leverages beam polarization and clean experimental environments to extract masses, couplings, and quantum numbers with unprecedented precision. The work also discusses how LC measurements would synergize with LHC discoveries, test grand unification, and probe exotic possibilities such as Z' bosons and extra dimensions, thereby shaping a long-term, 20-year strategy for TeV-scale physics. Overall, it establishes a cohesive case for constructing a 500 GeV linear collider as the foundation of a sustained exploration of the TeV frontier.”

Abstract

This Resource Book reviews the physics opportunities of a next-generation e+e- linear collider and discusses options for the experimental program. Part 1 contains the table of contents and introduction and gives a summary of the case for a 500 GeV linear collider.

Paper Structure

This paper contains 36 sections, 20 equations, 18 figures, 5 tables.

Table of Contents

  1. Introduction
  2. "The Case for a 500 GeV $e^+e^-$ Linear Collider"
  3. Introduction
  4. Lepton colliders and the long-term future of high energy physics
  5. A 20-year goal for high energy physics
  6. A 20-year program for accelerators
  7. Parameters of a 500 GeV linear collider
  8. Why we expect new physics below 500 GeV
  9. A fundamental versus composite Higgs boson
  10. A fundamental Higgs boson should be light
  11. The constraint on the Higgs mass from precision electroweak data
  12. The lightest supersymmetry partners are likely to appear at 500 GeV
  13. What if there is no fundamental Higgs boson?
  14. What if the LHC sees no new physics?
  15. Physics at a 500 GeV linear collider
  16. ...and 21 more sections

Figures (18)

  • Figure 2.1: Cross sections for a variety of physics processes at an $e^+e^-$ linear collider, from MiyamotoH.
  • Figure 2.2: Capability of the ATLAS experiment to study the Higgs sector of the MSSM ATLAS.
  • Figure 2.3: Processes for production of the Higgs boson at an $e^+e^-$ linear collider.
  • Figure 2.4: Higgs reconstruction in the process $e^+e^- \to Z^0 h^0$ for various Higgs boson masses, using $\ell^+\ell^-$, $\nu\overline{\nu}$, and hadronic $Z^0$ decays, for a 30 fb$^{-1}$ event sample at 300 GeV, from JLCone. The background is dominated by the process $e^+e^-\to Z^0 Z^0$, which produces the missing-mass peak at $m_Z$. The unshaded solid histogram gives the background if a $b$-tag is applied to the Higgs candidate. The dashed histograms in (a) and (b) show the background with no $b$-tag.
  • Figure 2.5: Determination of Higgs boson branching ratios in a variety of decay modes, from Battaglia. The error bars show the expected experimental errors for 500 fb$^{-1}$ at 350 GeV. The bands show the theoretical errors in the Standard Model predictions.
  • ...and 13 more figures