A special Higgs challenge: measuring the mass and production cross section with ultimate precision at FCC-ee View Full Text


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Article Info

DATE

2021-12-15

AUTHORS

Paolo Azzurri, Gregorio Bernardi, Sylvie Braibant, David d’Enterria, Jan Eysermans, Patrick Janot, Ang Li, Emmanuel Perez

ABSTRACT

The FCC-ee offers powerful opportunities to determine the Higgs boson parameters, exploiting over 106\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$10^6$$\end{document}e+e-→ZH\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${ \hbox {e}^+\hbox {e}^- \rightarrow \hbox {ZH}}$$\end{document} events and almost 105\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$10^5$$\end{document}WW→H\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${ \hbox {WW} \rightarrow \hbox {H}}$$\end{document} events at centre-of-mass energies around 240 and 365 GeV. This essay spotlights the important measurements of the ZH production cross section and of the Higgs boson mass. The measurement of the total ZH cross section is an essential input to the absolute determination of the HZZ coupling—a “standard candle” that can be used by all other measurements, including those made at hadron colliders—at the per-mil level. A combination of the measured cross sections at the two different centre-of-mass energies further provides the first evidence for the trilinear Higgs self-coupling, and possibly its first observation if the cross section measurement can be made accurate enough. The determination of the Higgs boson mass with a precision significantly better than the Higgs boson width (4.1 MeV in the standard model) is a prerequisite to either constrain or measure the electron Yukawa coupling via direct e+e-→H\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${ \hbox {e}^+\hbox {e}^- \rightarrow \hbox {H}}$$\end{document} production at s=125\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sqrt{s} = 125$$\end{document} GeV. Approaching the statistical limit of 0.1% and O(1)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathcal {O}}(1)$$\end{document} MeV on the ZH cross section and the Higgs boson mass, respectively, sets highly demanding requirements on accelerator operation (ZH threshold scan, centre-of-mass energy measurement), detector design (lepton momentum resolution, hadronic final state reconstruction performance), theoretical calculations, and analysis techniques (efficiency and purity optimization with modern tools, constrained kinematic fits, control of systematic uncertainties). These challenges are examined in turn in this essay More... »

PAGES

23

References to SciGraph publications

  • 2022-01-07. FCC-ee overview: new opportunities create new challenges in THE EUROPEAN PHYSICAL JOURNAL PLUS
  • 2021-11-02. The challenges of beam polarization and keV-scale centre-of-mass energy calibration at the FCC-ee in THE EUROPEAN PHYSICAL JOURNAL PLUS
  • 2021-12-02. The W mass and width measurement challenge at FCC-ee in THE EUROPEAN PHYSICAL JOURNAL PLUS
  • 2019-06-04. FCC-ee: The Lepton Collider in THE EUROPEAN PHYSICAL JOURNAL SPECIAL TOPICS
  • 2021-12-16. The challenge of monochromatization in THE EUROPEAN PHYSICAL JOURNAL PLUS
  • 2011-09-21. WHIZARD—simulating multi-particle processes at LHC and ILC in EUROPEAN PHYSICAL JOURNAL C
  • 2022-02-04. Measuring the electron Yukawa coupling via resonant s-channel Higgs production at FCC-ee in THE EUROPEAN PHYSICAL JOURNAL PLUS
  • 2018-07-12. Constraining the Higgs self-couplings at e+e− colliders in JOURNAL OF HIGH ENERGY PHYSICS
  • 2014-07-17. The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations in JOURNAL OF HIGH ENERGY PHYSICS
  • 2016-02-13. Model-independent measurement of the e+e-→ HZ cross section at a future e+e- linear collider using hadronic Z decays in EUROPEAN PHYSICAL JOURNAL C
  • 2018-02-28. A global view on the Higgs self-coupling at lepton colliders in JOURNAL OF HIGH ENERGY PHYSICS
  • 2020-01-21. Higgs Boson studies at future particle colliders in JOURNAL OF HIGH ENERGY PHYSICS
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    18 schema:description The FCC-ee offers powerful opportunities to determine the Higgs boson parameters, exploiting over 106\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$10^6$$\end{document}e+e-→ZH\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${ \hbox {e}^+\hbox {e}^- \rightarrow \hbox {ZH}}$$\end{document} events and almost 105\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$10^5$$\end{document}WW→H\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${ \hbox {WW} \rightarrow \hbox {H}}$$\end{document} events at centre-of-mass energies around 240 and 365 GeV. This essay spotlights the important measurements of the ZH production cross section and of the Higgs boson mass. The measurement of the total ZH cross section is an essential input to the absolute determination of the HZZ coupling—a “standard candle” that can be used by all other measurements, including those made at hadron colliders—at the per-mil level. A combination of the measured cross sections at the two different centre-of-mass energies further provides the first evidence for the trilinear Higgs self-coupling, and possibly its first observation if the cross section measurement can be made accurate enough. The determination of the Higgs boson mass with a precision significantly better than the Higgs boson width (4.1 MeV in the standard model) is a prerequisite to either constrain or measure the electron Yukawa coupling via direct e+e-→H\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${ \hbox {e}^+\hbox {e}^- \rightarrow \hbox {H}}$$\end{document} production at s=125\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sqrt{s} = 125$$\end{document} GeV. Approaching the statistical limit of 0.1% and O(1)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathcal {O}}(1)$$\end{document} MeV on the ZH cross section and the Higgs boson mass, respectively, sets highly demanding requirements on accelerator operation (ZH threshold scan, centre-of-mass energy measurement), detector design (lepton momentum resolution, hadronic final state reconstruction performance), theoretical calculations, and analysis techniques (efficiency and purity optimization with modern tools, constrained kinematic fits, control of systematic uncertainties). These challenges are examined in turn in this essay
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