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

Journal Article · · Chinese Physics C, High Energy Physics and Nuclear Physics
ORCiD logo [1];  [2]; ORCiD logo [3]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. The Univ. of Chicago, Chicago, IL (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China)

Discovery of unexpected properties of the Higgs boson offers an intriguing opportunity of shedding light on some of the most profound puzzles in particle physics. The 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 the 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 final 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, $$O(10^{-3}\sim10^{-5})$$ limits on the Higgs exotic decay branching fractions can be achieved using the leptonic decaying spectator $$Z$$ boson in the associated production mode $$e^+e^-\rightarrow Z H$$. We further discuss the interplay between the detector performance and Higgs exotic decay, and other possibilities of exotic decays. Finally, our work is a first step in a comprehensive study of Higgs exotic decays at future lepton colliders, which is a key ingredient of Higgs physics that deserves further investigation.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1345611
Report Number(s):
FERMILAB-PUB-16-608-T; arXiv:1612.09284; 1507128
Journal Information:
Chinese Physics C, High Energy Physics and Nuclear Physics, Vol. 41, Issue 6; ISSN 1674-1137
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Cited By (12)

Collider probes of singlet fermionic dark matter scenarios for the Fermi gamma-ray excess journal December 2018
Long live the Higgs factory: Higgs decays to long-lived particles at future lepton colliders journal April 2019
Charged lepton flavor violating Higgs decays at future $$e^+e^-$$ e + e - colliders journal October 2018
FCC Physics Opportunities: Future Circular Collider Conceptual Design Report Volume 1 journal June 2019
FCC-ee: The Lepton Collider: Future Circular Collider Conceptual Design Report Volume 2 journal June 2019
FCC Physics Opportunities text January 2019
FCC-ee: The Lepton Collider text January 2019
Improved Formalism for Precision Higgs Coupling Fits text January 2017
FCC-ee: The Lepton Collider text January 2019
Improved Formalism for Precision Higgs Coupling Fits text January 2018
Charged lepton flavor violating Higgs decays at future $e^+e^-$ colliders text January 2017
Collider probes of singlet fermionic dark matter scenarios for the Fermi gamma-ray excess text January 2018

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