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Title: Doubly-charged Higgs boson at a future electron-proton collider

Journal Article · · Physical Review D

We explore the discovery prospect of the doubly-charged component of an SU(2)L-triplet scalar at the future ep collider FCC-eh, proposed to operate with an electron beam energy of 60 GeV and a proton beam energy of 50 TeV. We consider the associated production of the doubly-charged Higgs boson along with leptons and jet(s), and its subsequent prompt decay to same-sign lepton pair. This occurs for O(1) Yukawa coupling of the scalar triplet with charged leptons, which is expected for reasonably small vacuum expectation values of the neutral component of the triplet field that governs the neutrino mass generation in the type-II seesaw. We present our analysis for two different final states, 3l + ≥ 1j and an inclusive ≥ 2l + ≥ 1j channel. Considering its decay to electrons only, we find that the doubly-charged Higgs boson with a mass around a TeV could be observed at the 3σ confidence level with O(200) fb–1 of integrated luminosity, while masses up to 2 TeV could be probed within a few years of data accumulation. The signal proposed here becomes essentially background free, if it is triggered in the μμ mode and a 5σ discovery is achievable in this channel for a TeV-scale doubly-charged Higgs boson with an integrated luminosity as low as O(50) fb–1. We also highlight the sensitivity of FCC-eh to the Yukawa coupling responsible for the production of the doubly-charged Higgs boson as a function of its mass in both the ee and μμ channels.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0017987
OSTI ID:
1525555
Alternate ID(s):
OSTI ID: 1612807
Journal Information:
Physical Review D, Journal Name: Physical Review D Vol. 99 Journal Issue: 11; ISSN 2470-0010
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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