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The Higgs Working Group: Summary Report

A. Djouadi, R. Kinnunen, E. Richter-Was, H. U. Martyn, K. A. Assamagan, C. Balazs, G. Belanger, E. Boos, F. Boudjema, M. Drees, N. Ghodbane, M. Guchait, S. Heinemeyer, V. Ilyin, J. Kalinowski, J. L. Kneur, R. Lafaye, D. J. Miller, S. Moretti, M. Muhlleitner, A. Nikitenko, K. Odagiri, D. P. Roy, M. Spira, K. Sridhar, D. Zeppenfeld

TL;DR

This paper provides a comprehensive assessment of Higgs boson physics prospects at TeV-scale colliders within the Standard Model and MSSM frameworks. It covers strategies for measuring Higgs couplings at the LHC, with an emphasis on combining inclusive and weak-boson-fusion channels to extract partial widths and the total width, while accounting for higher-order QCD corrections. It also analyzes MSSM Higgs production, including NLO QCD and SUSY-QCD corrections, as well as signatures of heavy charged Higgs bosons and the impact of light stops on LHC searches, complemented by double-Higgs production studies and a suite of tools. The findings indicate that the LHC can perform precision tests of the Higgs sector, constrain MSSM parameter space through multiple channels, and potentially measure width and coupling ratios to a 5–20% level, though robust results require continued detector-level studies and refined background modeling. Collectively, the work highlights the importance of diverse production modes, higher-order corrections, and new physics scenarios in shaping the Higgs program at current and future colliders.

Abstract

Report of the Higgs working group for the Workshop "Physics at TeV Colliders", Les Houches, France 8-18 June 1999. It contains 6 separate sections: 1. Measuring Higgs boson couplings at the LHC. 2. Higgs boson production at hadron colliders at NLO. 3. Signatures of Heavy Charged Higgs Bosons at the LHC. 4. Light stop effects and Higgs boson searches at the LHC. 5. Double Higgs production at TeV Colliders in the MSSM. 6. Programs and Tools for Higgs Bosons.

The Higgs Working Group: Summary Report

TL;DR

This paper provides a comprehensive assessment of Higgs boson physics prospects at TeV-scale colliders within the Standard Model and MSSM frameworks. It covers strategies for measuring Higgs couplings at the LHC, with an emphasis on combining inclusive and weak-boson-fusion channels to extract partial widths and the total width, while accounting for higher-order QCD corrections. It also analyzes MSSM Higgs production, including NLO QCD and SUSY-QCD corrections, as well as signatures of heavy charged Higgs bosons and the impact of light stops on LHC searches, complemented by double-Higgs production studies and a suite of tools. The findings indicate that the LHC can perform precision tests of the Higgs sector, constrain MSSM parameter space through multiple channels, and potentially measure width and coupling ratios to a 5–20% level, though robust results require continued detector-level studies and refined background modeling. Collectively, the work highlights the importance of diverse production modes, higher-order corrections, and new physics scenarios in shaping the Higgs program at current and future colliders.

Abstract

Report of the Higgs working group for the Workshop "Physics at TeV Colliders", Les Houches, France 8-18 June 1999. It contains 6 separate sections: 1. Measuring Higgs boson couplings at the LHC. 2. Higgs boson production at hadron colliders at NLO. 3. Signatures of Heavy Charged Higgs Bosons at the LHC. 4. Light stop effects and Higgs boson searches at the LHC. 5. Double Higgs production at TeV Colliders in the MSSM. 6. Programs and Tools for Higgs Bosons.

Paper Structure

This paper contains 18 sections, 34 equations, 14 figures, 7 tables.

Table of Contents

  1. Introduction
  2. Survey of intermediate mass Higgs channels
  3. Measurement of Higgs properties
  4. Summary
  5. Introduction
  6. MSSM neutral Higgs production at hadron colliders: Next--to--Leading--Order QCD corrections
  7. Summary of standard NLO QCD corrections
  8. SUSY QCD corrections
  9. Associated Higgs production with $b\bar{b}$ pairs
  10. Constraints on the MSSM parameter space
  11. QCD corrections to Higgs production in heavy quark fusion
  12. Higgs search in the $\gamma\gamma$+jet channel at LHC
  13. Introduction
  14. Production and decay modes of the $H^\pm$ bosons
  15. Signatures of $H^\pm$ bosons at the LHC
  16. ...and 3 more sections

Figures (14)

  • Figure 1: Expected accuracy with which the Higgs boson width can be measured at the LHC, with 100 fb$^{-1}$ of data in each experiment. Results are shown for the extraction of the the $H\to WW$ partial width, $\Gamma_W$, and and the total Higgs boson width, $\Gamma$. $\epsilon$ is the sum of the residual (small) branching ratios of unobserved channels, mainly $H\to c\bar{c}$ (see text).
  • Figure 1: Generic diagrams contributing to the SUSY-QCD corrections to the $q\bar{q} V$ vertex [$V=\gamma,Z,W$] at next--to--leading order.
  • Figure 1: Branching ratios of the charged Higgs boson decays for $\tan \beta=2$ and 30. They are obtained using the program HDECAY HDECAY3.
  • Figure 2: Relative corrections due to virtual squark and gluino exchange diagrams to Higgs boson production via Higgs-strahlung $q\bar{q}\to h+W/Z$ and vector boson fusion $qq\to qqV^*V^*\to qqh$ [$V=W,Z$] at the LHC (left) and the Tevatron (right).
  • Figure 2: Branching ratios of the charged Higgs boson decays into charginos and neutralinos as a function of $M_{H^\pm}$ for a set of $\tan \beta$ values; $M_2$ and $\mu$ are fixed to 200 GeV.
  • ...and 9 more figures