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Chinese Physics C> 2017, Vol. 41> Issue(6) : 063102 DOI: 10.1088/1674-1137/41/6/063102

Exotic decays of the 125 GeV Higgs boson at future e+e- colliders

  • 1.

      Theoretical Physics Department, Fermilab, Batavia, IL 60510, USA

  • 2.

      Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA

  • 3.

      Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

  • The discovery of unexpected properties of the Higgs boson would o er an intriguing opportunity to shed light on some of the most profound puzzles in particle physics. Beyond Standard Model (BSM) decays of the Higgs boson could reveal new physics in a direct manner. Future electron-positron lepton colliders operating as Higgs factories, including CEPC, FCC-ee and ILC, with the advantages of a clean collider environment and large statistics, could greatly enhance sensitivity in searching for these BSM decays. In this work, we perform a general study of Higgs exotic decays at future e+e- lepton colliders, focusing on the Higgs decays with hadronic nal states and/or missing energy, which are very challenging for the High-Luminosity program of the Large Hadron Collider (HL-LHC). We show that with simple selection cuts, O(10-3-10-5) limits on the Higgs exotic decay branching fractions can be achieved using the leptonic decaying spectator Z boson in the associated production mode e+e-→ZH. We further discuss the interplay between detector performance and Higgs exotic decays, and other possibilities of exotic decays. Our work is a rst step in a comprehensive study of Higgs exotic decays at future lepton colliders, which is a key area of Higgs physics that deserves further investigation.
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Zhen Liu, Lian-Tao Wang and Hao Zhang. Exotic decays of the 125 GeV Higgs boson at future e+e- colliders[J]. Chinese Physics C, 2017, 41(6): 063102. doi: 10.1088/1674-1137/41/6/063102
Zhen Liu, Lian-Tao Wang and Hao Zhang. Exotic decays of the 125 GeV Higgs boson at future e+e- colliders[J]. Chinese Physics C, 2017, 41(6): 063102.  doi: 10.1088/1674-1137/41/6/063102 shu
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Received: 2017-01-16
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    Supported by Fermi Research Alliance, LLC (DE-AC02-07CH11359) with the U.S. Department of Energy, DOE (DE-SC0013642), IHEP(Y6515580U1), and IHEP Innovation (Y4545171Y2)}

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Exotic decays of the 125 GeV Higgs boson at future e+e- colliders

    Corresponding author: Zhen Liu,
    Corresponding author: Lian-Tao Wang,
    Corresponding author: Hao Zhang,
  • 1.  Theoretical Physics Department, Fermilab, Batavia, IL 60510, USA
  • 2.  Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA
  • 3.  Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Received Date: 2017-01-16
  • Available Online: 2017-06-05
Fund Project:  Supported by Fermi Research Alliance, LLC (DE-AC02-07CH11359) with the U.S. Department of Energy, DOE (DE-SC0013642), IHEP(Y6515580U1), and IHEP Innovation (Y4545171Y2)}

Abstract: The discovery of unexpected properties of the Higgs boson would o er an intriguing opportunity to shed light on some of the most profound puzzles in particle physics. Beyond Standard Model (BSM) decays of the Higgs boson could reveal new physics in a direct manner. Future electron-positron lepton colliders operating as Higgs factories, including CEPC, FCC-ee and ILC, with the advantages of a clean collider environment and large statistics, could greatly enhance sensitivity in searching for these BSM decays. In this work, we perform a general study of Higgs exotic decays at future e+e- lepton colliders, focusing on the Higgs decays with hadronic nal states and/or missing energy, which are very challenging for the High-Luminosity program of the Large Hadron Collider (HL-LHC). We show that with simple selection cuts, O(10-3-10-5) limits on the Higgs exotic decay branching fractions can be achieved using the leptonic decaying spectator Z boson in the associated production mode e+e-→ZH. We further discuss the interplay between detector performance and Higgs exotic decays, and other possibilities of exotic decays. Our work is a rst step in a comprehensive study of Higgs exotic decays at future lepton colliders, which is a key area of Higgs physics that deserves further investigation.

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